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  • ASTROPHYSICS  (5)
  • *Planets
  • 1980-1984  (5)
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Year
  • 1
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    A Type Stars as Probes of the Local Interstellar Medium (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: With the aim to sample the Local Interstellar Medium (LISM), it was proposed to use A stars as targets. The Mg II UV lines seem to be the best interstellar absorption candidates. Several hundreths of A stars can be reached within 100 pc. First preliminary results (20 lines of sight) are presented, based on previous Copernicus and actual IUE observations.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 75-80
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Deuterium Abundance in the Local Interstellar Medium (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: The present situation of deuterium abundance evaluation in interstellar space is discussed, and it is shown that it should be or = .00001 by studying in more detail lambda the Sco line of sight and by observing two NaI interstellar components toward that star, it can be shown that the D/H evaluation made toward lambda Sco is in fact related to the local interstellar medium (less than 10 pc from the Sun). Because this evaluation is also or = .00001 it is in striking contrast with the one made toward alpha Aur (D/H or = .000018 confirming the fact that the deuterium abundance in the local interstellar medium varies by at least a factor of two over few parsecs.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 84-88
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    NASA TECHNICAL REPORTS
  • 3
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    Probe of the Nearby Interstellar Medium by the Vacant Line of Sight to Beta Cma (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: The line of sight to Beta CM a was probed by Copernicus observations. This particular line of sight is remarkable for the low mean densities. The density was found to be bar N sub H approximately .002/cu cm. Two separate regions were distinguished: (1) A local nearby HI region extends over a few parsecs from the Sun with a density of the order of 0.1/cu cm and a temperature of 11000 to 12500 K; (2) An HII region lies somewhere beyond the HI region and is spread over about 60pc. Its total hydrogen mean density is of the same order as the HI region, i.e., of approximately 0.1 cu cm and it contains only elements in low ionization state. All the ata are coherent with the picture of a cloud in ionization equilibrium at T approximately 23000 deg K.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 80-83
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    NASA TECHNICAL REPORTS
  • 4
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    The interstellar medium on the Gamma Cassiopeiae line of sight (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The interstellar medium on the Gamma Cas line of sight is studied through the observations of O I, H2, H I, D I, and Ar I absorption features with the Copernicus satellite. By using the velocity structure of the line of sight previously determined through atomic nitrogen, it is demonstrated that these neutrals are located in the same physical regions and that the O I and Ar I abundances could be solar, on the average, relative to N I in all components. The 1066.660 A Ar I line profile is contaminated by an unidentified line, already detected in the spectrum of Zeta Pup. Furthermore, a peculiar behavior of the Ar I abundance in the different components is reported, possibly associated with high-velocity interstellar gas present on the line of sight. It is concluded that the Gamma Cas line of sight could intercept a dense cloud which has been engulfed and disrupted by a shock.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 242
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  • 5
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    Transient components in the Lyman lines of hot stars Evidence for the ejection of shells or puffs on very short timescales (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The existence of H I transient components in the stellar wind of Epsilon Per toward eight early type stars observed by the Copernicus satellite is systematically investigated. It is shown that such transient components are indeed present in the spectra of five of these stars and have characteristics very similar to the one found in the case of Epsilon Per. It is shown that such components can be interpreted in terms of coherent 'puffs' or shells of matter ejected by the stars. They would be caused by an increase of the stellar mass loss rate by a factor of 1.5 to 3 during one hour or less, and would be accelerated more slowly than the quiet wind. It is suggested that such events must be due to instabilities in these stars which are all slightly evolved stars ranging in spectral types between O9 and B1. The instabilities are probably similar to those in Beta Cephei stars, i.e., nonradial pulsations.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 137; 1 Au
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