The origin of low-velocity absorption components in the MG II resonance lines of hybrid-chromosphere stars

Details The origin of low-velocity absorption components in the MG II resonance lines of hybrid-chromosphere stars The origin of low-velocity absorption components in the MG II resonance lines of hybrid-chromosphere stars

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..774d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 774-783.

Astronomy and Astrophysics

Astrophysics

30

Absorption Spectra, Chromosphere, Interstellar Matter, Late Stars, Metallic Stars, Resonance Lines, Iue, Magnesium, Radial Velocity, Stellar Atmospheres, Stellar Envelopes, Stellar Winds, Ultraviolet Spectra

Scientific paper

It is argued that the low-velocity absorption features seen in the Mg II resonance lines of seven confirmed and three probable hybrid-chromosphere stars are interstellar rather than circumstellar in origin. From a comparison of radial velocities based on all available spectra in the International Ultraviolet Explorer (IUE) archives with estimates of the interstellar velocity along each line of sight, a good correlation between the observed position of the low-velocity component and the predicted interstellar feature is found. It is also shown that previous arguments in favor of the circumstellar origin of the low-velocity absorption features are either incorrect or implausible. The conclusion of the present study may modify previously proposed models of hybrid star winds which have assumed a priori that both Mg II absorption components are circumstellar.

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