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  • Weitere Quellen  (435)
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  • 1
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    Unbekannt
    Digital recording and analysis of broad-band seismic data at the Gräfenberg (GRF)-array (1978)
    In:  J. Geophys., Berlin, Conseil de l'Europe, vol. 44, no. 31, pp. 511-523, pp. B04310, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismic arrays ; Broad-band ; Seismology ; Data analysis / ~ processing
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    The foreshock activity of the 1971 San Fernando earthquake, California (1978)
    In:  Bull. Seism. Soc. Am., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 68, no. 8, pp. 1265-1279, pp. L12S09, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Earthquake precursor: prediction research ; Fore-shocks ; Earthquake ; Earthquake precursor: statistical anal. of seismicity ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Determination of local magnitude, Ms-2dlus0, from strong-motion accelerograms (1978)
    In:  Bull. Seism. Soc. Am., Tokyo, Tokyo University, vol. 68, no. 2, pp. 471-485, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Strong motions ; Seismology ; BSSA ; local Magnitude
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
    facet.materialart.
    Unbekannt
    Seismological aspects of the Guatemala earthquake of February 4, 1976 (1978)
    In:  J. Geophys. Res., Tokyo, Tokyo University, vol. 83, no. 2, pp. 3427-3434, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Earthquake ; Seismology ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
    facet.materialart.
    Unbekannt
    The February 9, 1971 San Fernando earthquake: A study of source finiteness in teleseismic body waves (1978)
    In:  Bull. Seism. Soc. Am., Basel, Elsevier Science Publishers, vol. 68, no. 8, pp. 1-29, pp. L15S20, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Teleseismic events ; Earthquake ; Source ; Seismology ; Source parameters ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
    facet.materialart.
    Unbekannt
    A procedure for estimating lateral variations from low-frequency eigenspectra data (1978)
    In:  Geophys. J. R. astr. Soc., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 52, no. 5, pp. 441-455, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Data analysis / ~ processing ; Spectrum ; Spectral analysis ; Inhomogeneity ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
    facet.materialart.
    Unbekannt
    Quantification of earthquakes (1978)
    In:  Nature, Tokyo, Tokyo University, vol. 271, no. 2, pp. 411-414, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Source parameters ; Magnitude ; Review article
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
    facet.materialart.
    Unbekannt
    Transient and impulse responses of a one-dimensional linearly attenuating medium - II. A parametric study (1978)
    In:  Geophys. J. R. astr. Soc., Luxembourg, Conseil de l'Europe, vol. 52, no. 3, pp. 503-524, pp. B04202, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Attenuation ; Frequency ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
    facet.materialart.
    Unbekannt
    The Romanian earthquake of March 4, 1977. I. Rupture process inferred from fault-plane solution and multiple-event analysis (1978)
    In:  J. Geophys., Warszawa, American Geophysical Union, vol. 44, no. 1+2, pp. 203-218, pp. L08304, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Fracture ; Fault plane solution, focal mechanism ; Source ; Earthquake ; Seismology ; Moment tensor ; EUROPROBE (Geol. and Geophys. in eastern Europe) ; Muller ; Stoeckel ; Stockel
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 10
    facet.materialart.
    Unbekannt
    Transfer functions for the seismic research observatory seismograph system (1978)
    In:  Bull. Seism. Soc. Am., New York, August, vol. 68, no. 1, pp. 501-512, pp. 1610, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Transfer function ; SRO ; Instruments ; Seismic networks ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 11
    facet.materialart.
    Unbekannt
    Dynamic support of the outer rise (1978)
    In:  Geophys. Res. Lett., Hannover, Conseil de l'Europe, vol. 5, no. 6, pp. 321-324, pp. L04301, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Seismology ; Stress ; GRL
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 12
    facet.materialart.
    Unbekannt
    Slow earthquakes and stress redistribution (1978)
    In:  Nature, Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 275, no. 4, pp. 599-602, pp. L14311, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Stress ; silent ; red ; Source
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 13
    facet.materialart.
    Unbekannt
    Moment tensor inversions and source models (1978)
    In:  Geophys. J. R. astr. Soc., Leyden, Noordhoff International Publishing, vol. 52, no. B2, pp. 359-364, pp. B04306, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Moment tensor ; Source ; SModelling ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 14
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    Unbekannt
    Seismische Kriterien zur Standortwahl kerntechnischer Anlagen in der Bundesrepublik Deutschland (1978)
    Bundesanstalt f. Geowissenschaften und Rohstoffe
    In:  Hannover, Bundesanstalt f. Geowissenschaften und Rohstoffe, vol. 113, no. XVI:, pp. 1-14, (ISBN 1-56670-263-3)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Engineering geophys. ; Earthquake risk ; Earthquake hazard
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 15
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    Unbekannt
    Dynamics in prestressed media with moving boundaries: A continuum theory of failure in solids (1978)
    In:  Geophys. J. R. astr. Soc., Amsterdam, Elsevier Scientific Publishing Company, vol. 52, no. 12, pp. 65-96, pp. 1390
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Fracture ; GJRaS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 16
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    Unbekannt
    Earthquake aftershocks as Green's functions (1978)
    In:  Geophys. Res. Letters, Münster, 3, vol. 5, no. 6, pp. 1-4, pp. L23301, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Source ; Aftershocks ; Green's function ; GRL
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 17
    facet.materialart.
    Unbekannt
    Q of the Earth (1978)
    In:  J. Geophys. Res., Luxembourg, EGS-Gauthier-Villars, vol. 83, no. 6717, pp. 5869-5882, pp. 2324
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Attenuation ; Absorption ; Scattering ; Seismology ; Earth rotation ; Earth tides ; Quality factor ; JGR
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 18
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    Unbekannt
    The influence of rupture incoherence on seismic directivity (1978)
    In:  Bull. Seism. Soc. Am., Luxembourg, Conseil de l'Europe, vol. 68, no. 8, pp. 283-300, pp. L15S17, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Source parameters ; Fracture ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 19
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    Unbekannt
    Regional variation of the scaling law of earthquake source spectra (1978)
    In:  Bull. Seism. Soc. Am., Taipei, Elsevier, vol. 68, no. 3, pp. 49-79, pp. TC1002, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Source ; Spectrum ; Scaling ; Nuclear explosion ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 20
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    Unbekannt
    Radiant flux as a guide to relative seismic efficiency (1978)
    In:  Tectonophys., Dordrecht, D. Reidel, vol. 51, no. 5, pp. T39-T46, pp. TC5003, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Energy (of earthquakes) ; Source parameters ; Magnitude ; FROTH ; (abstract)
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 21
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    Unbekannt
    Multivariate autoregressive representation of seismic signals with application to short-period discrimination (1978)
    In:  Bull. Seism. Soc. Am., Warszawa, EGS, vol. 68, no. 3, pp. 735-756, pp. L02611, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Filter- ; Auto-Regressive Moving Average-process ; Discrimination ; High frequency ... ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 22
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    Unbekannt
    Recent seismometrical works in Japan (1978)
    Center for Acad. Publ. Japan
    In:  Bull., Open-File Rept., Earthquake Precursors, Tokyo, Center for Acad. Publ. Japan, vol. 65, no. 1, pp. 69-78, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Earthquake precursor: prediction research ; Seismology ; Project report/description ; Review article
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 23
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    Unbekannt
    A study of the stability of solutions of the inverse problem of seismology in the geometrical optics approximation (1978)
    In:  Vychislitel'naya Seismogogiya, Luxembourg, Conseil de l'Europe, vol. 11, no. B7, pp. 111-133, pp. 2131, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Inversion
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 24
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    Unbekannt
    Simulation of strong-motion displacements using surface-wave modal superposition (1978)
    In:  Bull. seism. Soc. Am., Washington, D.C., AGU, vol. 68, no. 1, pp. 907-922, pp. 2090, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Synthetic seismograms ; Surface waves ; NOModelling ; Layers ; Strong motions ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 25
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    Unbekannt
    Spectral analysis of the coda waves from local earthquakes (1978)
    In:  Bull. Earthq. Res. Inst. (Tokyo), Taipei, EGS, vol. 53, no. 12, pp. 1-48, pp. L12306, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Spectral analysis ; Seismology ; Scattering
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 26
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    Unbekannt
    Seismological precursors to a magnitude 5 earthquake in the Central Aleutian Islands (1978)
    Center for Akad. Publ. Japan
    In:  Professional Paper, Earthquake Precursors, Tokyo, Center for Akad. Publ. Japan, vol. 4, no. 231, pp. 243-250, (ISBN 1-4020-1729-4)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity ; Seismology ; Earthquake ; Seismicity
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 27
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    Unbekannt
    Lokalisierung von Erdbeben in Medien mit beliebiger Geschwindigkeits-Tiefen-Verteilung unter Einschluß späterer Einsätze und die Hypozentren im Bereich des südlichen Oberrheingrabens von 1971 bis 1975 (1978)
    Fakultät für Physik
    In:  Dissertation, Universität Karlsruhe, Fakultät für Physik, vol. 10, no. WS-693 7-83, pp. 235-239, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Location ; Seismology ; Velocity ; Hypocentral depth ; Earth model, also for more shallow analyses ! ; Velocity depth profile
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 28
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    Wavelet processing (1978)
    In:  Seventh Annual IPA Convention, Atlanta, Soc. Explorat. Geophys., vol. C 560, 183 pp., no. 8, pp. 480-482, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Waves ; Seismology ; Wavelet processing
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 29
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    A relation between seismic moment and stress drop of complex earthquakes (1978)
    USGS, Open file Rep. 78-380 and Inst. Phys. du Globe, Univ. Paris VI, IPG No. 275
    In:  Proc. Conf. III, Fault Mechanics and its Relation to Earthquake Prediction, Nat. Earthq. Hazard Reduction Program, 1-3.12.1977, Hanscom Air Force Base, USGS, Open file Rep. 78-380 and Inst. Phys. du Globe, Univ. Paris VI, IPG No. 275, vol. C 560, 183 pp., no. PL-TR-91-2212(II), pp. 319-337, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Stress ; Earthquake precursor: prediction research ; seismic Moment ; Stress drop ; FROTH, ; FRUMMEL
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 30
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    Seismic monitoring at The Geysers geothermal field, California (1978)
    U.S. Geol. Surv.
    In:  Open-File Report, Potsdam, U.S. Geol. Surv., vol. C 560, 183 pp., no. 78 (?), pp. 1448-1451, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismic networks ; Geothermics ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 31
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    Unbekannt
    Untersuchungen zur Ortung von Herden seismischer Ereignisse, dargestellt an Beispielen aus einem Stationsnetz (1978)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Dissertation, Berichte Reihe A, Aachen, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 6, pp. 429-433, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Seismic networks ; Location ; Induced seismicity ; Rock bursts (see also ERDSTOSS and GEBIRGSSCHLAG)
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 32
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    Unbekannt
    Sonograms of SRO broad-band recorded events (1978)
    MIT Lincoln Lab.
    In:  Semiannual Technical Summary Report, Lexington, Mass., MIT Lincoln Lab., vol. 10, no. 87-437, pp. 9, 29-31, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; PIC ; son ; SRO ; Broad-band ; Seismic networks
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 33
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    Unbekannt
    Focal mechanism studies in the New Madrid seismic zone (1978)
    In:  Bull. Seism. Soc. Am., Zagreb, Conseil de l'Europe, vol. 68, no. 4, pp. 1095-1102, pp. L02307, (ISSN 0343-5164)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Fault plane solution, focal mechanism ; Source parameters ; BSSA
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 34
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    Unbekannt
    Erdbeben in der Bundesrepublik Deutschland 1974 (1978)
    Seismologischen Zentralobservatorium Gräfenberg
    In:  Berichte der seismologischen Observatorien in der Bundesrepublik Deutschland mit einem Katalog wichtiger Weltbeben, Oslo, Seismologischen Zentralobservatorium Gräfenberg, vol. 10, no. 421, pp. 1-24, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Earthquake catalog ; Germany ; Seismic networks ; Seismology
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 35
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    Unbekannt
    Hypocenter location program HYPOInversionSE (1978)
    U. S. Geol. Surv.
    In:  Open-File Report, Hannover, U. S. Geol. Surv., vol. C 560, 183 pp., no. 78-694, pp. 1-113, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Seismology ; Location ; Hypocentral depth ; software ; USGS
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 36
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    Ermittlung der Krustenstruktur in der Umgebung des seismologischen Zentralobservatoriums Erlangen aus Spektren von P-Wellen (1978)
    Inst. f. Geophys., Univ.
    In:  Diplomarbeit, Hamburg, Inst. f. Geophys., Univ., vol. C 560, 183 pp., no. PL-TR-91-2130, pp. 1-113, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): P-waves ; CRUST ; Seismology ; Seismic arrays ; Spectrum
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 37
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    Positions of galactic X-ray sources - l/II/ between 320 and 340 deg (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The precise (20-40 sec) positions of seven X-ray sources in the celestial region corresponding to the galactic longitude range from 320 to 340 deg are reported. The sources include a recurrent transient X-ray source (MX1608-52) and a source 2S1553-542 coincident with a gamma-ray source within the given errors of position. The positions reported reduce the previously reported areas of the error region for six of the sources by factors ranging from 10 to 100. The presented results add confidence to the proposed radio candidates for 4U1624-49 and 4U1642-45 considered by Sanduleak and Dolan (1974) and Seaquist (1977).
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 271; Jan. 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 38
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    An observational study of the AFCRL infrared sky survey. III - Further searches for AFCRL/AFGL sources and an evaluation of the contents of the mid-infrared sky (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 219
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 39
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    On humanity's role in space (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Manned spaceflight is considered within the framework of two broad categories: human exploitation of space for economic or scientific gain, and human habitation of space as a place where man may live, grow, and actualize himself. With the advent of the Space Shuttle, exploitation of space will take the form of new product development. This will continue during the 1990s as the new products are manufactured on a scale large enough to be profitable. The turn of the century should see major industries in space, and large space habitats. Thus, the question of mankind's existential needs arises. In addition to basic physical needs, the spiritual and cultural requirements of human beings must be considered. The impact of man's presence in space upon human culture in general is discussed with reference to international cooperation, public interest in space programs, scientific advancement, the basic urge to explore, and the density of mankind as a whole; which will become free of external constraints as we step into the cosmos.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Spaceflight; 20; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 40
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    Airborne infrared spectrophotometry of Mira variables (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Airborne spectrophotometric observations of R Cas near minimum and maximum light, R Leo near minimum, and NML Tau near maximum are reported which were obtained over the wavelength range from 1.2 to 4 microns with 1.5% resolution. The spectral energy distributions of the three stars at the indicated times are presented, and it is shown that the H2O bands at 1.4, 1.9, and 2.7 microns are clearly evident in all the spectra, while the absorption bands of CO at about 1.6 and 2.3 microns are probably present although they are masked by the strong water vapor features. The results indicate that water vapor is the dominant opacity source in the atmospheres of Mira variables, that R Leo and NML Tau may be fitted well over the entire spectrum by respective single temperatures of 2250 and 1800 K, and that R Cas near both minimum and maximum cannot be adequately described by one temperature over the entire wavelength range investigated. The shapes and depths of the absorption bands are determined together with the apparent angular diameter of each star and the equivalent widths of the H2O + CO absorption bands. It is concluded that water vapor absorption is more strongly correlated with color temperature than with spectral type for R Cas and R Leo.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Jan. 197
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  • 41
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    Cygnus A at 99 GHz - Observations of the three principal components and interpretation of the central source (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The three principal emission components of Cygnus A have been observed at 99 GHz, the highest frequency at which radio measurements of this source have been accomplished. The observations show no definite indication of a high-frequency cutoff in the spectrum of the compact central component, which perhaps may be attributed to an optically thin synchrotron source that peaks at a frequency of several hundred GHz.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 220
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  • 42
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    Future directions in experimental gamma ray astronomy (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Better vehicles and instruments are needed if gamma ray spectroscopy in astrophysics and cosmology is to advance. A gamma ray observatory will (1) permit long-term observations of selected sources to measure their variability and to achieve high sensitivity; (2) measure periods in days or weeks; and (3) assess the entire sky to observe various predicted sources, to measure the energy spectrum, and to map the isotropy of the cosmic ray background over larger collecting areas (of the order of a square meter). Conventional and unconventional instruments must cover the energy range from 0.1 MeV to 20 MeV with improved sensitivity. Angular resolution must be improved one degree or more to study discrete X-ray sources in the galactic center. Actively collimated detectors, improved double Compton instruments, and gamma ray correlators to actively synthesize the absolute energy spectrum of the sky protons are discussed as well as the need for scientific balloons.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 492-497
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  • 43
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    Gamma ray astronomy and the origin of the light nuclei (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Nuclear reactions induced by the collisions of the protons and alphas of the galactic cosmic ray with heavy nuclei of the interstellar gas are responsible for the continuous production of the light elements lithium, beryllium, and boron in the galaxy. To better than one order of magnitude, the observed ratios of these abundances to hydrogen abundance and the nuclidic abundance ratios between themselves are accounted for by simply considering the effect of fast protons and alphas with a flux and an energy spectrum as observed in galactic cosmic rays, for a period comparable with the life of our galaxy. The role of gamma ray astronomy in solving problems that occur when accurate agreement is sought with increasingly accurate data is discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 283-301
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  • 44
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    Spectral reflectivities of the Galilean satellites and Titan, 0.32 to 0.86 micrometers (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Icarus; 36; Dec. 197
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  • 45
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    Near-infrared energy distributions of M31 (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectrophotometric data obtained by comparing Spinrad-Taylor (1969) standards with Alpha Lyr are presented, along with a calibration of these data for wavelengths longward of 6000 A. M31 sky measurements made 1 deg south of the nucleus at five wavelengths between 6040 and 10,360 A, inclusive, are compared with near-IR spectrophotometry performed by Spinrad and Taylor (1971), Oke and Schwarzschild (1975), and O'Connell (1976). Agreement and discrepancies among the different data sets are discussed. Some possible explanations of the differences are discounted, and tests are performed which reveal no effects of error in mean extinction and brightness-dependent wavelength response.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Nov. 197
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  • 46
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    X-ray emission from UX Arietis - RS Canum Venaticorum systems as a class of coronal X-ray sources (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 225
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  • 47
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    Preliminary results of linear polarization measurements at 99 GHz (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The results of the first linear polarization measurements of extrasolar radio sources at a frequency above 35 GHz are presented. For the quasars 3C 273 and 3C 345, the observed position angles are in accord with the predictions of Inoue, and the measurements are consistent with the suggestion that the compact components responsible for the high-frequency emission are affected by high degrees of internal Faraday depolarization. For the radio galaxy 3C 274 (Virgo A) the observed position angle and degree of polarization are consistent with the model of Hobbs and Waak.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 223
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  • 48
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    X-ray observations of BL Lacertae objects (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are reported for OSO 8 and HEAO 1 X-ray observations of the BL Lac objects Mrk 421, Mrk 501, and PKS 0548-322 over the energy range from 2 to 60 keV. It is found that the X-ray spectra of Mrk 421 and 501 are similar, exhibit statistically significant soft X-ray excesses, lack low-energy absorption, and are best fitted by power laws over the 2-30-keV range with respective photon indices of approximately 0.91 and 1.2 and respective hydrogen column densities of less than 8 x 10 to the 21st per sq cm and no more than 1.8 x 10 to the 22nd per sq cm. It is noted that the spectral index for both sources is identical, within errors, to the HF radio spectral index and that Mrk 421 experienced a factor of 6 decrease in the 2-10-keV band over a six-month period. A tentative identification of PKS 0548-322 with the source H0548-32 is suggested.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 226
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  • 49
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    Instrumentation for infrared astronomy (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: During the last 10 years, infrared astronomy, based on observations in the wavelength range from 2 to 1000 micrometers, has become a major field of observational astrophysics. This development is mainly related to two major technical advances. Extremely sensitive detectors have been developed and become available for astronomical applications. Motivated by the first development, major groups have expended much effort in building and operating telescopes above most or all of the earth's atmosphere in order to circumvent its opacity and emission throughout the range. Attention is given to advances in the area of infrared detectors, platforms for infrared astronomy, focal plane instruments, high spatial resolution instrumentation, and infrared polarization measurements.
    Schlagwort(e): ASTRONOMY
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  • 50
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    Assess II - A simulated mission of Spacelab (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: For Assess II, the Spacelab mission simulation conducted in mid-1977, four payload specialists aboard a Convair 990 research aircraft performed six American and six European experiments during nine research flights each of six hours duration in order to evaluate the compatibility of training and experimental design. Mission organization and some initial data from the European experiments are reported. The experiments, conducted over the western U.S., involved infrared astronomy, solar brightness temperature, lidar, airglow TV, and a medical experiment for which physiological parameters were monitored. Conclusions concerning general principles of experiment design are discussed.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Nature; 275; Sept. 7
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  • 51
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    A 4.8 hour periodicity in the spectra of Cygnus X-3 (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The X-ray binary Cyg X-3 has been observed on three occasions during 1975 and 1976 by the GSFC Cosmic X-Ray Spectroscopy Experiment on OSO 8. The X-ray spectra from all three observations can be represented by power-law continua with strong iron line emission. Comparisons of spectra taken within the same observation at various phases of the 4.8 hour period reveal a relative excess of low-energy X-ray emission near zero phase (i.e., the minimum) of the 4.8 hour modulation. In addition, the centroid of the line emission is observed to vary in phase with the 4.8 hour cycle. The possibility of persistent thermal X-ray emission from material surrounding the binary system is introduced in an effort to account for the observed effects.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 224
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  • 52
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    New luster for space robots and automation (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Consideration is given to the potential role of robotics and automation in space transportation systems. Automation development requirements are defined for projects in space exploration, global services, space utilization, and space transport. In each category the potential automation of ground operations, on-board spacecraft operations, and in-space handling is noted. The major developments of space robot technology are noted for the 1967-1978 period. Economic aspects of ground-operation, ground command, and mission operations are noted.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Astronautics and Aeronautics; 16; Sept
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  • 53
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    Observations of low-luminosity X-ray sources in Vela-Puppis (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are presented for a study of the X-ray emission from a small portion of the galactic plane near galactic longitude 260 deg. This region contains at least six low-luminosity X-ray sources within about 10 deg of PSR 0833-45, which is near the center of the Gum nebula. The X-ray source 4U 0833-45, associated with the Vela pulsar, is observed at twice its 4U catalog intensity. The lack of X-ray pulsations at the pulsar period (greater than 99% nonpulsed), the nonthermal power-law spectrum, and models of the X-ray source distribution in this region suggest that a large fraction of the X-rays come from an extended source about 1 deg of arc in radius. The observation of a high-temperature (effective temperature at least 100 million K) spectrum in a field of view containing only Puppis A among known sources has led to the discovery of new OSO 8 source, OS 0752-39. Other spectra from this region are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 223
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  • 54
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    Observation of X-ray eclipses from LMC X-4 (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Observations made with the Rotation Modulation Collimator system (RMC) have revealed that X-ray source X-4 in the Large Magellanic Cloud (LMC X-4) is most likely part of a binary system. An analysis of the star's coordinates is presented, with attention given to orbital period and flux intensity variations. Stellar mass and orbital inclination angle are estimated for both X-4 and its companion star.
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 271; Jan. 5
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  • 55
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    New works in space (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Goods and services that may be furnished by the Space Shuttle are described. A single multibeam antenna array capable of supplying satellite communication for 256 U.S. cities, a disaster warning network, and a TV link to remote areas is discussed. Attention is also given to such materials processing programs as crystal growth (for example, production of mercuric iodide crystals for gamma-ray detectors), eutectic growth of solid-solution crystals such as mercury-cadmium-telluride, manufacture of uniform latex spheres for medical applications, and development of small glass spheres for fusion power applications. In addition to the Space Telescope, a meter-class telescope on the Shuttle and a wide-field survey instrument are under study.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Astronautics and Aeronautics; 16; Jan. 197
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  • 56
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    Rice University observations of the galactic center (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The most sensitive of the four balloon fight observations of the galactic center made by Rice University was conducted in 1974 from Rio Cuarto, Argentina at a float altitude of 4 mbar. The count rate spectrum of the observed background and the energy spectrum of the galactic center region are discussed. The detector used consists of a 6 inch Nal(T 1ambda) central detector collimated to approximately 15 deg FWHM by a Nal(T lamdba) anticoincidence shield. The shield in at least two interaction mean free paths thick at all gamma ray energies. The instrumental resolution is approximately 11% FWHM at 662 keV. Pulses from the central detector are analyzed by two 256 channel PHA's covering the energy range approximately 20 keV to approximately 12 MeV. The detector is equatorially mounted and pointed by command from the ground. Observations are made by measuring source and background alternately for 10 minute periods. Background is measured by rotating the detector 180 deg about the azimuthal axis.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 223-227
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    Far-infrared observations of sources associated with double-lobed reflection nebulae (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Far-infrared observations of GL 915, 618, 2688 and OH 0739-14 are presented. The data provide information on the total flux arising in each of these sources, and on the wavelength-dependence of the emissivity of the associated dust. Two sources, GL 618 and GL 2688, have far-infrared continua similar to those recently observed in planetary nebulae.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 65; 1, Ap; Apr. 197
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  • 58
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    Aspheric grating for extreme ultraviolet astronomy (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: A family of plane curves is developed which can diffract incident parallel rays to a point focus. These curves, termed diffractoidal curves, are rotated around an axis to produce surfaces of revolution correspondingly termed diffractoids, whose imaging properties for sources at infinity are studied by ray tracing in a few examples. The paraboloid emerges as a limiting case of the diffractoid. A comparison is made between the stigmatic focusing properties of the diffractoid and the toroidal grating.
    Schlagwort(e): ASTRONOMY
    Materialart: Applied Optics; 17; Apr. 15
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  • 59
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    Collision frequency of artificial satellites - The creation of a debris belt (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The probability of satellite collisions increases with the number of satellites. In the present paper, possible time scales for the growth of a debris belt from collision fragments are determined, and possible consequences of continued unrestrained launch activities are examined. Use is made of techniques formerly developed for studying the evolution (growth) of the asteroid belt. A model describing the flux from the known earth-orbiting satellites is developed, and the results from this model are extrapolated in time to predict the collision frequency between satellites. Hypervelocity impact phenomena are then examined to predict the debris flux resulting from collisions. The results are applied to design requirements for three types of future space missions.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Journal of Geophysical Research; 83; June 1
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  • 60
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    The X-ray emitting galaxy Centaurus A (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: OSO-8 X-ray observations of Cen A in 1975 and 1976 are reported. The source spectrum can be well fitted in both years by a power law of number index 1.66 and absorption due to 1.3 by 10 to the 23rd power atoms/sq cm. The total flux varied by a factor of 2 between 1975 and 1976. In 1976 there were flux variations of approximately 40% on a time scale of days. Measurements of the 6.4-keV Fe fluorescent line and the 7.1-keV absorption edge imply Fe/H of approximately 0.000016. Simultaneous radio measurements show variation in phase with X-ray variability. Consideration of radio, millimeter, infrared, and X-ray data shows that all the data can be accounted for by a model in which the X-rays are due to a synchrotron self-Compton source embedded in a cold H2 cloud.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 220
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    On the accelerations of the moon and sun, the constant of gravitation, and the origin of mountains (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: On the assumption of a constant value for the gravitational constant G, the lunar and solar tidal couples and the rate of change of angular velocity of the earth are recalculated on the basis of the improved values for the apparent accelerations of the moon and sun arrived at by Muller and Stephenson (1977). These new values are then used to derive general dynamical equations with a changing moment of inertia and changing G connecting the apparent accelerations to the lunar and solar couples. The effect of a changing G is considered, and a value of (dG/dt)/G = -3 times 10 to the -11th power per yr can be reconciled only weakly with the improved accelerations, especially for the case of linear friction. For quadratic friction the situation is more favorable. The new accelerations, however, are best reconciled with a nonchanging G, and certainly cannot be reconciled with a value of (dG/dt)/G = -6 times 10 to the -11th power per yr.
    Schlagwort(e): ASTRONOMY
    Materialart: Moon and the Planets; 18; Apr. 197
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    C3 and infrared spectrophotometry of Y Canum Venaticorum (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The 1.2- to 5.6-micron spectrum of the carbon star Y CVn is presented and discussed. The observations were made from the Kuiper Airborne Observatory at an altitude of 12.5 km, thereby avoiding most of the absorption due to terrestrial water vapor. Comparison of Y CVn near 5 microns with laboratory spectra provides possible evidence for the presence of the linear triatomic molecule C3. For the first time in a carbon star the clearly formed band heads of the CN red system between 1.2 and 2.3 microns are observed. Corroborative evidence for the presence of the molecules HCN and C2H2 is presented, and the relative contributions of C3, HCN, and C2H2 to the 3.1-micron absorption band are discussed. Spectra of two other carbon stars, TX Psc and S Cep, are presented for comparison.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 222
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  • 63
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    Orbital changes of the gaseous ring around Be stars. II - Apsidal motion and slow drift of the orbital elements (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: It is shown that the observed data about the apsidal motion of gaseous rings around some Be stars, like Beta(1) Mon and Pi Aqr, cannot be explained solely by the influence of the equatorial bulge. This fact has prompted the development of a theory of apsidal motion and slow drift of orbital elements that is based on the mixing of slowly escaping gases from the central star with gases in the emission ring around it. Thus, the basic physical idea in this paper follows closely what has been advanced in the first paper of this series but the mathematical treatment has been broadened in order to deal with the actual orbits, instead of osculating orbits, of particles in the ring. In accordance with this theory, it is believed that in cases where no mixing of gases takes place, the apsidal motion is controlled solely by the equatorial bulge. But in cases where mixing takes place, the apsidal motion depends upon the manner of gas mixing as well.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 219
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  • 64
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    The exploration of comets (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The structure and origin of comets are reviewed with reference to future cometary research involving fly by and rendezvous missions. Ion-driven spacecraft, to be launched from a Shuttle in the mid-1980s, will theoretically be able to make close observations of Halley's Comet, and fly on to either Tempel 2 or Borelly's Comet during the course of the same mission. A rendezvous, whereby the spacecraft follows a comet in its path around the sun, is considered preferable to a fly by, which will allow only a few hours of observation. Suggested equipment for comet research include IR sensors, X- and Gamma-ray spectrometers, and possibly SEM to analyze the composition of cometary dust particles.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Technology Review; 80; Mar
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  • 65
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    Sharpening stellar images (1978)
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    Publikationsdatum: 2011-08-17
    Beschreibung: A prototype telescope system with six movable elements has been used with sharpness detection procedures to observe objects as dim as fifth magnitude. The real-time image sharpening technique does not rely on the use of a reference star. By correcting for atmospherically induced phase perturbations, the sharpening system has permitted restoration of stellar images to the diffraction limit (in one dimension) for a 30-cm telescope. Application of the system to the separation of double stars is reported.
    Schlagwort(e): ASTRONOMY
    Materialart: Science; 200; May 5
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  • 66
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    Nonthermal galactic emission below 10 megahertz (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The Radio Astronomy Explorer 2 (RAE 2) lunar-orbiting satellite has provided measurements of the nonthermal galactic radio emission at frequencies below 10 MHz. Measurements of the emission spectra are presented for the center, anticenter, north polar, and south polar directions at 22 frequencies between 0.25 and 9.18 MHz. Survey maps of the spatial distribution of the observed low-frequency Galactic emission at 1.31, 2.20, 3.93, 4.70, 6.55, and 9.18 MHz are presented. The observations were obtained with the 229-m traveling-wave V antenna on this lunar-orbiting spacecraft. The improved frequency coverage offers additional insights into the structure of the local Galactic neighborhood.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 221
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    Are supernovae radio sources - A search for radio emission from young supernova remnants (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A search has been conducted for radio emission at 11 and 3.7 cm from 46 recent supernovae having accurately determined positions and ages of a few months to 79 years. None of these supernovae was detected at a flux density greater than 5-10 mJy. These negative results cannot be explained by internal absorption and are thus due to intrinsically weak synchrotron emission in young supernova remnants. There are two possibilities: either (1) relativistic particles are accelerated not by the supernova outburst but by processes occurring much later (at least about 75 years) in the remnant or (2) the magnetic field in the young remnants evolves very slowly, in proportion to the inverse square root of time, so that its value in the remnants observed was no more than about 0.002 gauss. The constraints the observations place on these possibilities and on the energy in cosmic rays in young remnants are discussed. Gamma-ray observations at times of no more than about 1 year following an outburst will allow one to discriminate between the two alternative explanations of the radio results.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 220
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    Minor planets and related objects. XXIV - Photometric observations for /5/ Astraea (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Five light curves of (5) Astraea are presented along with UBV photometric results and analyses of the pole orientation, sidereal period, sense of rotation, and color coefficients. A sidereal period of 16 hr 48 min 43.60 sec (+ or - 0.03 sec) with a retrograde sense of rotation is adopted as well as a North Pole position at +9 deg (+ or 1 deg) latitude and 148 deg (+ or - 3 deg) ecliptic longitude. It is noted that an amplitude-aspect plot indicates an amplitude of the order of 0.37 magnitude for an equatorial-aspect light curve of Astraea
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Feb. 197
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  • 69
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    A note on obtaining an approximate value for the period of a periodic solution of x-double prime = -V prime /x/ (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The first integral of x-double prime = - V prime (x) yields an integral for the period of a periodic solution, if such exists. In general, this integral cannot be evaluated. By means of an approximate solution along with the minimization of a mean-square error, one can obtain an approximate value for the period in terms of the amplitude of the motion. The calculated period agrees very well with the period obtained by means of numerical integration for the case of orbit-orbit resonance involving the motion of two satellites of a planet. The same method is applied to obtain an alternative derivation of the first Krylov-Bogoliuboff averaging method in nonlinear mechanics.
    Schlagwort(e): ASTRONOMY
    Materialart: Celestial Mechanics; 18; July 197
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  • 70
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    COBE - Explorer of the primeval explosion (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The Cosmic Background Explorer satellite will measure the diffuse microwave and infrared emission from the universe over the entire wavelength range from a few microns to 13 mm with unprecedented sensitivity and accuracy. It will measure the spectrum and angular distribution of the cosmic background radiation thought to be remnant of the big bang explosion, and it may also detect the radiation produced by the primal stars and galaxies. Furthermore, it will gather a large body of data permitting detailed study of the distribution, spectra, and temperature of the interstellar and interplanetary dust.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Astronautics and Aeronautics; 16; Oct. 197
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  • 71
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    A short history of Pulkovo Observatory (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Vistas in Astronomy; 22; pt. 1
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  • 72
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    The far-ultraviolet flux from Lambda Orionis A (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Digicon observations of emission-line intensities in the H II region around Lambda Ori are used to determine the effective UV ionizing flux from Lambda Ori A. It appears that the flux shortward of 353 A (and perhaps shortward of 504 A) is significantly less than predicted from calculations of static stellar atmospheres. The discrepancy between theory and observation may be a consequence of the existence of an extended atmosphere due to radiation-pressure-driven mass loss. The results are consistent with those obtained from UV absorption-line studies made with the Copernicus satellite and with radio recombination-line data for compact H II regions.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 223
    Format: text
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  • 73
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    Vacuum in the wake of space vehicles (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Vacuum conditions to be encountered in the wakes of high altitude unmanned space vehicles are calculated in order to demonstrate possibilities for conducting experiments using the high pumping speeds and very high vacuum (down to 10 to the -15th torr) attainable. The flux of ambient particles backscattered by emissions from spacecraft surfaces is modelled for an idealized Long Duration Exposure Facility spacecraft structure in an orbit of 550 km altitude. The total backscattered fluxes are found to be between 3 x 10 to the 4th and 3 x 10 to the 5th per sq cm sec for H and between 10 to the 6th and 10 to the 7th per sq cm sec for He and O, depending on the angle with respect to the wake axis. It is found that the direct ambient hydrogen flux is an order of magnitude greater than the backscattered flux, while the backscattered fluxes of He and O are greater than the direct fluxes. It is pointed out that care should be taken in designing space experiments to enable these theoretical conditions to be met.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Vacuum; 28; Feb. 197
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  • 74
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    A synthetic light curve solution of the OAO-2 ultraviolet light curves of u Herculis (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: OAO 2 ultraviolet photometry of the eclipsing binary u Her is reported and interpreted. The light curve of u Her is found to be intrinsically variable, the variable light curve is rectified, and the adjusted light and color curves are plotted. A simultaneous solution to three adjusted OAO 2 light curves (at respective wavelengths of 3320, 1910, and 1550 A) is obtained by using the Roche model. The results indicate that the system is semidetached if the gravity darkening of the secondary is not significantly larger than expected. It is suggested that the primary is responsible for the variable light curve, that the monochromatic albedo of the secondary is very low at short wavelengths, and that the depth of primary eclipse is strongly dependent on the primary's limb darkening.
    Schlagwort(e): ASTRONOMY
    Materialart: Acta Astronomica; 28; 4, 19; 1978
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  • 75
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    Minor planets and related objects. XXVI - Magnitudes for the numbered asteroids (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Dec. 197
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  • 76
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    Optical infrared sky survey (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A description is presented of a photographic survey of the northern sky currently underway at Steward Observatory. The survey is being conducted at a principal bandpass of 8000-9000 A supplemented by a V bandpass. The survey is the first of its type conducted using a small (20-in. aperture) wide-field telescope, a very large-format (146 mm) image intensifier with a red-extended, multialkali photocathode. The output phosphor of the intensifier is photographed with IIaD emulsion on film. One of the goals of the survey is to catalog red stellar objects on the photographs and to examine in detail regions of the sky which are obscured by hydrogen emission on conventional photographs.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Dec. 197
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  • 77
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    1978 photometry of V711 Tauri=HR 1099 - During the radio outburst (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 83; Dec. 197
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  • 78
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    X-ray observations of a flare in NGC 4151 from OSO 8 (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The 2-60-keV flux from NGC 4151 has been observed to change by a factor of 2 on a time scale of 1.5 days. No fluctuations in excess of a factor of 3 are detected on time scales less than 4 hours. During a total observation of approximately 11 days there were no statistically significant changes in spectral shape. The spectrum can be fitted by a power law with photon index of about 1.42 + or - 0.06 and a hydrogen column density of approximately 7.5 + or - 0.5 x 10 to the 22nd power atoms/sq cm. A 2-sigma residual to this fit implies fluorescent Fe line emission with an equivalent width of about 240 eV. Both synchrotron self-Compton and thermal Compton models are consistent with the X-ray data.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 225
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  • 79
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    Technology assessment and outlook (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The development of large space structures (LSS) for the 1980s is surveyed. Consideration is given to LSS mission requirements, large space antenna technology, several steps towards LSS development (1985-1995), structures technology needs (e.g., structural design criteria, assembly concepts, and practical joint and member concepts), structural dynamics/controls technology needs, and materials technology needs (e.g., accelerated test techniques and life prediction techniques).
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Astronautics and Aeronautics; 16; Oct. 197
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  • 80
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    IUE observations of hot stars - HZ43, BD +75 deg 325, NGC 6826, SS Cygni, Eta Carinae (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: During the commissioning phase of IUE observations were made of a selection of hot stars: the white dwarf HZ43, the hot subdwarf BD +75 deg 325, the nucleus of the planetary nebula NGC 6826, the dwarf nova SS Cygni, and the peculiar object Eta Carinae. The observations were made in the low dispersion mode and the data have been reduced using a preliminary calibration. The results are presented and discussed for each object.
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 275; Oct. 5
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  • 81
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    OSO 8 X-ray spectra of clusters of galaxies. I - Observations of twenty clusters: Physical correlations (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: OSO 8 X-ray spectra from 2 to 20 keV have been analyzed for 26 clusters of galaxies. For 20 clusters temperatures, emission integrals, iron abundances, and low-energy absorption measurements are presented. The data give, in general, better fits to thermal bremsstrahlung than to power-law models. Eight clusters have positive iron emission-line detections at the 90% confidence level, and all 20 cluster spectra are consistent with Fe/H = 0.000014 by number with the possible exception of Virgo. Thus it is confirmed that X-ray emission in this energy band is predominantly thermal radiation from hot intracluster gas rather than inverse Compton radiation. Physical correlations between X-ray spectral parameters and other cluster properties are examined. It is found that (1) the X-ray temperature is approximately proportional to the square of the velocity dispersion of the galaxies; (2) the emission integral is a strong function of the X-ray temperature; (3) the X-ray temperature and emission integral are better correlated with cluster central-galaxy density than with richness; and (4) the fraction of galaxies which are spirals is correlated with the observed ram pressure in the cluster core.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 225
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  • 82
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    Tidal effects in the O-type eclipsing system LY Aurigae (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Existing photometry of the O9.5 III eclipsing binary LY Aur is discussed and combined into a visual mean light curve. It is found that the observed light curve is incompatible with previous solutions based on the Russell model, but a respectable fit to the observed light curve can be achieved by assuming von Zeipel gravity darkening provided the system is allowed to be in marginal contact, which involves an unrealistically large change in the mass ratio to obtain the appropriate eclipse depths and light ratio. The alternative possibilities are considered that the primary is tidally distorted more than expected for its relative radius and the observed mass ratio or that von Zeipel gravity darkening is not appropriate for O-type stars and photometric effects exist which magnify the effects of the primary's physical distortions in the light curve. A solution is favored in which the ratio of radii is near 0.75 and the primary is very highly gravity darkened relative to von Zeipel's law.
    Schlagwort(e): ASTRONOMY
    Materialart: Acta Astronomica; 28; 2, 19; 1978
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  • 83
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    Making clouds in Spacelab (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Improvements in the accuracy of weather predictions and possibilities for changing the weather might depend on a better understanding of the microphysical processes which take place within clouds. A study of these processes on the surface of the earth is difficult in connection with gravitational disturbances. An Atmospheric Cloud Physics Laboratory (ACPL), which is currently being developed, is to be carried into space in the Spacelab in the early 1980's. This facility will provide scientists, for the first time, with the opportunity to study cloud physics without the disturbing gravitational effects. In the ACPL facility, a microscopic element can be suspended without support. The processes of freezing, thawing, collision, electric charging, and temperature changes can be observed and photographed as many times and for as long as necessary.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: Spaceflight; 20; Sept
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  • 84
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    The Space Telescope - A giant step in astronomy (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The astronomer's capacity for observation will be tremendously enhanced by NASA's Space Telescope, a multipurpose optical telescope in earth orbit which will enable man to gaze seven times farther into space than has now been done, possibly to the outer edges of the universe. The Space Telescope is to be placed in orbit in 1983 by the NASA Space Shuttle. The turbulence of the earth atmosphere imposes practical limitations in all but a very few types of astronomical observations conducted on the surface of the earth. The Space Telescope, high above the hazy and turbulent atmosphere, will enable scientists to see the heavens clearly for the first time. The Space Telescope is a superb system that fully exploits the advantages of space observations and will dramatically extend the astronomer's capabilities beyond ground-based telescopes.
    Schlagwort(e): ASTRONOMY
    Materialart: Spaceflight; 20; Sept
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  • 85
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    How do earth tides affect astronomers? (1978)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Earth tides affect astronomical observations of the Earth's rotation in the following two ways: (1) verticals are deflected; and (2) the polar moment of inertia of the Earth is changed causing periodic variations in the rotation rate. The diurnal and semidiurnal tides and nutation were examined in periodic variations. Results indicate little change occured in the polar motions. Nutation observations were disturbed rather seriously by the diurnal tides.
    Schlagwort(e): ASTRONOMY
    Materialart: Ohio State Univ. Appl. of Geodesy to Geodyn., an Intern. Symp.; p 341-343
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  • 86
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    Decameter-wave radio observations of Jupiter during the 1977 apparition (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-28
    Beschreibung: A catalog of observations of Jupiter's sporadic decameter wavelength radio emissions obtained with the Goddard Space Flight Center Jupiter Monitor Network between June 1977 and May 1978 is presented. Data were collected using the Goddard Space Flight Center station in Greenbelt, MD. and at facilities installed at Orroral Valley (Canberra), Australia and the Nancay Radio Observatory in France. Observations were obtained daily at frequencies of 16.7 and 22.2 MHz using five-element Yagi antennas at each end of a two-element interferometer. Plots of the two dimensional emission occurrence probability distribution are given.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-84012 , X-695-78-25
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  • 87
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    A solar extreme ultraviolet telescope and spectrograph for space shuttle. Volume 1: Investigation and technical plan (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: A scientific investigation of heating and mass transport in the solar corona that is currently planned for a future Shuttle/Spacelab flight is outlined. The instrument to be used is a near-normal incidence grating spectrograph fed by a grazing incidence Wolter Type 2 telescope. A toroidal grating design provides stigmatic images of the corona up to 8 arc min in extent over the spectral region from 225 A to 370 A. Spatial resolution of at least 2 arc sec and spectral resolution of 0.050 A is achievable throughout the central 4 arc min field or view. Primary scientific data are recorded on Schumann-type film. An H-alpha slit jaw monitor and zero order extreme ultraviolet monitor are also planned to support instrument operation.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-80643
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  • 88
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    Observations of interstellar lines of Na I and/or Ca II toward 47 stars (1978)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal Supplement Series; 38; Oct. 197
    Format: text
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  • 89
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    Critical phenomena experiments in space (1978)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The paper analyzes several types of critical phenomena in fluids, shows how they are affected by the presence of gravity, and describes how experiments conducted in an orbiting laboratory under low gravity conditions could extend the range of measurements needed to study critical phenomena. Future experiments are proposed. One would be a careful measurement of the dielectric constant in a low gravity environment. Two basic problems that can benefit especially from space experiments are the specific heat near the critical point and the shear viscosity at the gas-liquid critical point.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
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  • 90
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    Effects of diffraction in multiple-grid telescopes for X-ray astronomy (1978)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Diffraction effects in modern designs for grid collimator telescopes (assumed to have roughly a 100-micron grid period) are apparent at wavelengths longer than 1 A and are dominant at wavelengths longer than 10 A. In collimators with many grids spaced far apart the effects of diffracation are to reduce strongly the peak transmission of the collimator at longer wavelengths and to broaden it by about the amount expected from Fraunhofer diffraction through a slit the size of the grid openings. Comparisons between two-collimator measurements and the present calculations show reasonable agreement; it is therefore concluded that the present single-collimator calculation gives a good representation of their diffraction-limited angular response.
    Schlagwort(e): ASTRONOMY
    Materialart: Optical Society of America; vol. 68
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  • 91
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    High energy X-ray spectra of cygnus XR-1 observed from OSO-8 (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: X-ray spectra of Cygnus XR-1 were measured with the scintillation spectrometer on board the OSO-8 satellite during a period of one and one-half to three weeks in each of the years from 1975 to 1977. Observations were made when the source was both in a high state and in a low state. Typical spectra of the source between 15 and 250 keV are presented. The observed pivoting effect is consistent with two temperature accretion disk models of the X-ray emitting region. No significant break in the spectrum occurred at energies up to 150 keV. The high state as defined in the 3 to 6 keV bandwidth was found to be the higher luminosity state of the X-ray source. One transition from a low to a high state occurred during observations. The time of occurrence of this and other transitions is consistent with the hypothesis that all intensity transitions occur near periastron of the binary system, and that such transitions are caused by changes in the mass transfer rate between the primary and the accretion disk around the secondary.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-79626
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  • 92
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    Comet Tempel 2: Orbit, ephemerides and error analysis (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The dynamical behavior of comet Tempel 2 is investigated and the comet is found to be very well behaved and easily predictable. The nongravitational forces affecting the motion of this comet are the smallest of any comet that is affected by nongravitational forces. The sign and time history of these nongravitational forces imply (1) a direct rotation of the comet's nucleus and (2) the comet's ability to outgas has not changed substantially over its entire observational history. The well behaved dynamical motion of the comet, the well observed past apparitions, the small nongravitational forces and the excellent 1988 ground based observing conditions all contribute to relatively small position and velocity errors in 1988 -- the year of a proposed rendezvous space mission to this comet. To assist in planned ground based and earth orbital observations of this comet, ephemerides are given for the 1978-79, 1983-84 and 1988 apparitions.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-157598 , JPL-PUB-78-85
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  • 93
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    Cross sections relevant to gamma ray astronomy (1978)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Gamma-ray production cross sections were measured for protons and alpha particles incident on targets consisting of nuclei of high cosmic abundance: C-12, N-14, O-16, Ne-20, Mg-24, Si-28 and Fe-56. Solid or gaseous targets were bombarded by monoenergetic beams of protons and alpha particles, and gamma rays were detected by two Ge(Li) detectors. The proton energy for each target was varied from threshold to about 24 MeV (lab); for alphas the range was from threshold to about 27 MeV. For most transitions, it was possible to measure the total cross section by placing the detectors at 30.5 deg and 109.9 deg where the fourth-order Legendre polynomial is zero. For the case of the 16O (E sub gamma = 6.13 MeV, multipolarity E3) cross sections, yields were measured at four angles. Absolute cross sections were obtained by integrating the beam current and by measuring target thicknesses and detector efficiencies. The Ge(Li) detector resolution was a few keV (although the peak widths were greater, due to Doppler broadening).
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 498-501
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  • 94
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    Analysis and design optimization of the 1.2m X-ray telescope, volume 1 (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: An image space analysis and optimization and a performance analysis of the telescope assembly in the presence of various alignment errors are reported. Possible tests arrangements for 1.2 m or 1.5 m diameter X-ray telescopes are elaborated.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-150775
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  • 95
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    The potential for astrometry in the infrared (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Infrared interferometry promises to be a useful astrometric technique. Preliminary measurements of the star alpha Orionis made with a heterodyne interferometer exhibit phase coherence over a period of at least 1000 seconds. The measurements were equivalent to a positional determination of 60 milliarcsecond accuracy every 5 seconds of integration.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-157400
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  • 96
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    Analysis of star pair latitudes (1978)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Star pair latitude observations forming the basis for the pole positions reported by the International Polar Motion Service (IPMS) are processed to produce a mean pole position. However, the time series of raw observations contains high frequency information which is lost in the calculation of the mean pole. Analysis of 2931 star pair observations reveals a possible large excitation at one cycle per solar day. The average power level in the frequency band of the tesseral tides is seen to be high, although the peaks do not occur at the expected tidal frequencies.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-79593
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  • 97
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    Long-term studies with the Ariel-5 asm. 1: Her X-1, Vela X-1 and Cen X-3 (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Twelve hundred days of 3-6 keV X-ray data from Her X-1, Vela X-1 and Cen X-3 accumulated with the Ariel-5 all-sky monitor are interrogated. The binary periodicities of all three can be clearly observed, as can the approximately 35-d variation of Her X-1, for which we can refine the period to 34.875 plus or minus .030-d. No such longer-term periodicity less than 200-d is observed from Vela X-1. The 26.6-d low-state recurrence period for Cen X-3 previously suggested is not observed, but a 43.0-d candidate periodicity is found which may be consistent with the precession of an accretion disk in that system. The present results are illustrative of the long-term studies which can be performed on approximately 50 sources over a temporal base which will ultimately extend to at least 1800 days.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-79605
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    Apollo-Soyuz test project Extreme Ultraviolet Telescope MA-083 (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Follow-on studies to the Apollo-Soyuz Extreme Ultraviolet Telescope experiment (MA-083) include analyses of individual target stars or classes of stars, not only with regard to the EUV data but also in connection with theoretical models and observations in other parts of the spectrum. Topics discussed include: observations of SS Cygni, Proxima Centauri, HZ 43, and Feige 24; computer searches for new EUV sources; Sirius: models and inferences; EUV emission from a hot gas; and the diffuse EUV background.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-151707 , UCBSSL-SER-18-ISSUE-76
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 99
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    Far infrared polarization of the Kleinmann-Low Nebula in Orion (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Elongated dust grains aligned by local magnetic fields are though to absorb background radiation and produce linear and circular polarization which exhibit strong wavelength dependence in the near infrared. The NASA Kuiper observatory 91 cm infrared telescope was used to observe polarization characteristics of the Kleinmann-Low nebula in four far infrared wavelength bands in order to detect emission from these same oriented grains at longer wavelengths, and determine whether this radiation shows a direction of polarization perpendicular to that seen in the near infrared. The polarization, if any, that characterized the radiation in the three longest wavelength filter positions (28-48 micron, 44-72 micron, and 70-115 micron) is small. The noisiest measurements were obtained in the 16-33 micron filter position. Possible explanations for the low polarization observed at long wavelengths are explored.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-157307 , CRSR-695
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 100
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    OSO-8 X-ray spectra of clusters of galaxies. 2: Discussion (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: X-ray spectral parameters obtained from 2 to 20 keV OSO-8 data on X-ray clusters and optical cluster properties were examined to obtain information for restricting models for hot intracluster gas structures. Topics discussed include the radius of the X-ray core in relation to the galaxy core radius, the viral mass of hotter clusters, and galaxy density and optical central cluster properties. A population of cool, dim X-ray clusters which have not been observed is predicted. The iron abundance determinations recently quoted for intracluster gas are uncertain by 50 to greater than 100 percent from this nonstatistical cause alone.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-79577
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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