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  • ASTROPHYSICS  (1,995)
  • 1985-1989  (1,652)
  • 1975-1979  (343)
  • 1987  (943)
  • 1985  (709)
  • 1975  (343)
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  • 1985-1989  (1,652)
  • 1975-1979  (343)
Year
  • 1
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    Review of results on Halley's comet (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Since its recovery in 1982, Comet Halley has been the focus of an unparalleled global scientific effort of exploration. Remote and in situ measurements were conducted from the ground, from earth orbit, from Venus orbit, from interplanetary space, and from the comet itself. Many discoveries, such as the presence of an unexpectedly large and dark nucleus or the abundance of organic material, have led to major changes in the ideas about the general nature of comets. In this report, results of various studies are summarized.
    Keywords: ASTROPHYSICS
    Type: European Regional Astronomy Meeting of the IAU; Aug 24, 1987 - Aug 29, 1987; Prague; Czechoslovakia
    Format: text
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  • 2
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    The M-type stars (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The papers in this volume cover the following topics: (1) basic properties and photometric variability of M and related stars; (2) spectroscopy and nonthermal processes; (3) circumstellar radio molecular lines; (4) circumstellar shells, the formation of grains, and radiation transfer; (5) mass loss; (6) circumstellar chemistry; (7) thermal atmospheric models; (8) quasi-thermal models; (9) observations on the atmospheres of M dwarfs; and (1) theoretical work on M dwarfs.
    Keywords: ASTROPHYSICS
    Type: NASA-SP-492 , NAS 1.21:492 , LC-87-11340
    Format: application/pdf
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  • 3
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    A 3-D computational model for solar wind/magnetosphere interactions - Prediction of polar flattening of Jupiter and Saturn magnetospheres (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The development of a computational model for determining the solution of the gasdynamic portion of the gasdynamic convected magnetic field model for solar wind flow past three-dimensional magnetoionopauses of nonaxisymmetric shape is described. Results are presented for the shape of the bow wave and the flow properties in magnetosheaths of polar flattened magnetopauses representative of Jupiter and Saturn. Through a parametric study in which the amount of polar flattening is varied, a quantitative determination is obtained of the degree of flattening at both Jupiter and Saturn. These new three-dimensional results are shown to be in good agreement with observations, and account for most of the differences between the observations and the axisymmetric model results.
    Keywords: ASTROPHYSICS
    Type: AIAA PAPER 87-1411
    Format: text
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  • 4
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    Zhamanshin meteor crater (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A historical survey and geographic, geologic and geophysical characteristics, the results of many years of study of the Zhamanshin meteor crater in the Northern Aral region, are reported. From this data the likely initial configuration and cause of formation of the crater are reconstructed. Petrographic and mineralogical analyses are given of the brecciated and remelted rocks, of the zhamanshinites and irgizite tektites in particular. The impact melting, dispersion and quenching processes resulting in tektite formation are discussed.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-88531 , NAS 1.15:88531
    Format: application/pdf
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  • 5
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    Meteoritic evidence that graphite is rare in the interstellar medium (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Carbonaceous material from several distinct astrophysical environments that has been identified in primitive meteorites is discussed. Most of this material is not well crystallized graphite, but ranges from kerogenlike macromolecular organic matter to poorly graphitized carbon. Of the small fraction of the carbonaceous material which is graphite, most may have resulted from the graphitization of macromolecular precursors in the solar nebula. Since graphite is more stable than those precursors, preexisting interstellar graphite should have survived in meteorites to at least the same extent as did other forms of carbon. It is concluded from this dearth of graphite that graphitic carbon was not a major component of the interstellar dust at the time of the formation of the solar system.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 318; 166-168
    Format: text
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  • 6
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    Observational studies of the symbiotic stars. III High-dispersion IUE and H-alpha observations of EG Andromedae (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: High-dispersion IUE and optical spectra are presented for the symbiotic star EG Andromedae (HD 4174). Remarkable emission-line strength and profile variations are confirmed for the S IV, O IV, C IV, and He II ultraviolet lines as well as H-alpha. Accurate cross-correlation absorption-line velocities determined from Ti I, Ca I, and Fe I features convincingly demonstrate that EG And is a single-lined spectroscopic binary. The velocity curve suggests that the photometric ephemeris reported by Smith in 1980 should be revised by a redefinition of zero phase by about 0.08 of a period. The primary of the system may be similar to the central star of a planetary nebula embedded in a dense nebula with a mild stellar wind. The behavior of the emission lines is interpreted to indicate that the primary and its surrounding nebula suffer a partial eclipse by the cool giant secondary.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 295; 620-627
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  • 7
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    The geometric extent of C II (UV 0.01) emitting regions around luminous, late-type stars (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A method is presented by which the geometric extent of the chromospheres around late-type stars can be estimated from measurements of the total emission-line flux and line ratios within the C II (UV 0.01) multiplet. Application of this technique to a sample of 15 late-type stars indicates a clear difference in the radial extent of the chromospheres around coronal and noncoronal stars. The former stars appear to have very thin chromospheres (of no more than 0.1 percent of the photospheric radius), while the latter stars have chromospheres extending, on average, out to 2.5 photospheric radii. This, in principle, provides information for understanding structural differences between late-type giant and supergiant stars with and without coronae, and could lead to an understanding of the mass-loss mechanisms involved.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 289; 676-680
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  • 8
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    Rotational modulation of chromospheric emission in cool giants and 'hybrid' stars (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Archival data from the International Ultraviolet Explorer have been used to study temporal variations of the Mg II h and k emission lines in eight late-type giants. Evidence is presented that the variations are periodic in nature. It is argued that the periodicities can be interpreted in terms of rotation. It is found that the four fastest rotators in the sample are 'hybrid' stars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 288; 310-328
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  • 9
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    Anharmonicity and the interstellar polycyclic aromatic hydrocarbon infrared emission spectrum (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The hypothesis that interstellar infrared emission originates from vibrationally excited polycyclic aromatic hydrocarbons (PAHs) requires that emission can arise from all vibrational levels that are energetically accessible. Due to anharmonicity, the emission from the upper vibrational levels is shifted to longer wavelengths from that of the v = 1-0 transition. It is shown that structure in the 3-micron region is readily and quantitatively explained by emission from upper vibrational levels of excited PAHs that contain a maximum of 20-30 carbon atoms. The asymmetrical broadening of the 11.3-micron emission band may also be due to anharmonicity.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 315; L61-L65
    Format: text
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  • 10
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    Jovian magnetic fields is complex, Pioneer 11 shows (1975)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: An analysis of the magnetic field of the planet Jupiter is presented. The data are based on the information returned by Pioneer 11 space probe. It was determined that the magnetic field stretches across 9 million miles of space at some times and shrinks in volume by three-fourths or more at other times. It was also determined that electrons trapped in the magnetic field of Jupiter are 10,000 times more intense than those in the Van Allen radiation belts which circle the earth. Additional data were obtained on the polar regions, atmospheric circulation, and the nature of the moons.
    Keywords: ASTROPHYSICS
    Type: NASA-NEWS-RELEASE-75-49
    Format: application/pdf
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