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

Abstract

view Abstract Citations (34) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The origin of low-velocity absorption components in the MG II resonance lines of hybrid-chromosphere stars. Drake, S. A. ; Brown, A. ; Linsky, J. L. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1984 DOI: 10.1086/162459 Bibcode: 1984ApJ...284..774D Keywords: Absorption Spectra; Chromosphere; Interstellar Matter; Late Stars; Metallic Stars; Resonance Lines; Iue; Magnesium; Radial Velocity; Stellar Atmospheres; Stellar Envelopes; Stellar Winds; Ultraviolet Spectra; Astrophysics full text sources ADS | data products SIMBAD (9) MAST (1) INES (1)