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  • 1
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    Infrared spectroscopy and photometry of Comet Austin 1990 V (1993)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: 3-micron and 10-micron spectra and IR photometry of the dynamically new Comet Austin 1990 V were obtained for March-May 1990. An unusual 9-11 micron emission feature 15-20 percent above the continuum is evident at 0.78 AU postperihelion. The shape, in particular a peak at 11.06 micron, differs from that seen in Halley and several other comets, suggesting a difference in the mineralogy of the silicate grains. The 3.1-7.7 micron spectrum at 0.35 AU shows no obvious feature; feature/continuum contrast of the 3.36 micron emission feature is less than about 5 percent. Based on the IR photometry and a dust model weighted toward small grains, the dust production rate on 6 May at 0.78 AU was about 3 x 10 exp 5 g/s. The corresponding dust/gas mass ratio was about 0.1, classifying Austin as a dust-poor comet. This designation refers only to the relative dust cross section, not to the total mass.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Icarus (ISSN 0019-1035); 101; 1; p. 64-70.
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  • 2
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    8-13 micron spectroscopy and IR photometry of Comet P/Brorsen-Metcalf (1989o) near perihelion (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Thermal IR spectrophotometry of Comet P/Brorsen-Metcalf near perihelion was obtained during August 28-September 6, 1989, by the NASA IRTF; these data are presently compared with results for Comet P/Halley. The spectra, which lacked silicate emission, are consistent with 400-430 K grey body emission. The grains are on these bases inferred to have been larger than typical for either new comets or P/Halley. Attention is given to the composition, mass, temperature, and character of the cometary dust in view of Comet P/Halley study results.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Icarus (ISSN 0019-1035); 97; 2, Ju; 269-275
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  • 3
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    8- to 13-micron spectroscopy of Comet Levy 1990 XX (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The results are reported of IR spectroscopy of Comet Levy 1990 XX over a three-day period when the comet was about 1.54 AU from the sun roughly 70 days before perihelion. Comet Levy 1990 XX was bright, and for at least part of its inbound journey toward perihelion, active. At a distance of 1.54 AU from the sun it showed strong structured silicate emission with peaks or shoulders at 9.8 and 11.2 microns. These features resemble those of Comets P/Halley and Bradfield 1987 XXIX. The comet was variable in brightness. Specifically, the contrast of the silicate features changed by a factor of two relative to the continuum level and showed some evidence for a shape change as well.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Icarus (ISSN 0019-1035); 100; 1; p. 197-202.
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  • 4
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    Pioneer Venus and near-earth observations of interplanetary shocks (1987)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Twenty-three transient interplanetary shocks observed near earth during 1978-1982, and mostly reported in the literature, have also been identified at the Pioneer Venus Orbiter spacecraft. There seems to be a fairly consistent trend for lower shock speeds, farther from the sun. Shock normals obtained using the Pioneer Venus data correspond well with published values from near earth. By referring to the portion of the Pioneer Venus plasma data used here from locations at longitudes within 37 deg of earth, it is found that shocks are weaker at earth, compared with those closer to the sun.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 92; 3385-339
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  • 5
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    Observations of the unidentified 3.3 micron emission feature in nebulae (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectrophotometric observations from 2.1 to 4.1 microns of a variety of objects exhibiting the 3.3-micron emission feature (first detected in NGC 7027) are reported. The characteristics of the feature, the various environments in which it is found, and possible emission mechanisms are discussed in light of all the available observations of the feature to date. A resonance feature in solids is the most probable emission mechanism; however, no satisfactory identification has yet been made on the basis of infrared spectroscopy of terrestrial materials.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 213
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  • 6
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    2-4 micron spectrophotometric observations of compact H II regions (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectrophotometric observations from 2 to 4 microns of the compact H II regions W51-IRS 2, K3-50, and NGC 7538 are reported. Spectral features observed include hydrogen recombination lines and an absorption attributed to interstellar ice. Extinctions to the various sources are derived based on the observed hydrogen lines and radio fluxes. Thermal dust emission is found to dominate free-free and bound-free emission for wavelengths not less than 2 microns. The ice absorption is analyzed and compared with the extinction and 10 microns silicate absorption. A 3.3 micron emission feature (potentially due to the same material as in NGC 7027) was observed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 210; Dec. 1
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  • 7
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    Infrared observations of ices and silicates in molecular clouds (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Spectrophotometric observations from 2 to 4 microns and from 8 to 13 microns of several infrared sources associated with molecular clouds are reported. Narrow absorption features at 3.08 microns, attributed to interstellar ices, appear in all sources with a molecular cloud in the intervening line of sight. All sources showing ice absorptions also show broad absorption features, attributed to cold silicates, from 8 to 13 microns. The observed ice absorption profiles are all quite similar; however, they do not fit in detail Mie theory predictions of extinction for pure H2O or NH3 ices. The ratio of ice-to-silicate optical depths is found to vary, with most sources showing a ratio in the range 0.1-0.4. The ratio of visual extinction to ice absorption is found to increase rapidly from inside to outside the molecular cloud in NGC 2024.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 207; Aug. 1
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  • 8
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    Silicates and variability in comets Okazaki-Levy-Rudenko (1989r) and Austin (1989c1) (1990)
    In:  Other Sources
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    Publikationsdatum: 2013-08-29
    Beschreibung: Comet Okazaki-Levy-Rudenko (1989r) was studied over a wide range of wavelengths from the UV to the submillimeter. Using visual magnitude estimates from the IAU Circulars and reported submillimeter fluxes in conjunction with the thermal infrared spectroscopy and filter photometry, the nature of the grains and the behavior of the comet can be assessed and compared to other comets studied under this program. In addition, preliminary results from a collaborative infrared study of Comet Austin are presented which address the nature of the dust in that comet. Progress on a model for cometary properties and brightness behavior is discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Southwest Research Inst., Workshop on Observations of Recent Comets (1990); p 92-96
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  • 9
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    Comparison of P/Brorsen-Metcalf and P/Halley in the thermal infrared (1990)
    In:  Other Sources
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    Publikationsdatum: 2013-08-29
    Beschreibung: Of the periodic comets, only comets Halley and Brorsen-Metcalf have periods of the order of 75 years and are bright enough to study spectroscopically in the infrared. Thermal IR spectroscopy of comet P/Brorsen-Metcalf near perihelion are presented and the results are compared to comet P/Halley.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Southwest Research Inst., Workshop on Observations of Recent Comets (1990); p 70-74
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  • 10
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    The infrared source associated with Sh 2-149 (1978)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Observations at optical and infrared wavelengths of the bright infrared point source in the direction of Sh 2-149 are used to determine a spectral type (M1) and luminosity class (Ib-II) for the object. These observations contradict the suggestion of Bergeat et al. (1975) that the object is a highly reddened O star. The estimated visual extinction (approximately 5-7 magnitudes) and luminosity class derived from the present observations are used to estimate the distance (about 1-3 kpc) to the infrared source.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomy and Astrophysics; 67; 2, Ju; July 197
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