Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985iraj...17..128l&link_type=abstract
Irish Astronomical Journal (ISSN 0021-1052), vol. 17, Sept. 1985, p. 128-131. Research supported by the Department of Education
Astronomy and Astrophysics
Astronomy
Stellar Atmospheres, Stellar Composition, Stellar Evolution, Stellar Winds, Supergiant Stars, Thermodynamic Equilibrium, Atmospheric Models, Data Reduction, Wolf-Rayet Stars
Scientific paper
A preliminary report is offered on the LTE analysis of the visible spectrum of two extreme B-type supergiants, HD 148379 (B1.5 Ia) and HD 157038 (B3 Ia). HD 157038 has been associated with the OBN stars. The observational data consisted of 6.9-angstroms/mm coude spectra obtained with the 1.9-m SAAO telescope which covered the visible spectrum from approximately 3450 angstroms to 4800 angstroms. It is postulated that HD 157038 has evolved off the main sequence into a transitory red supergiant stage where extensive mass loss and mixing altered its surface chemical composition. The star subsequently evolved bluewards in the HR diagram to appear as a hot blue supergiant with modified surface composition, in the slow stages of core helium burning. HD 148379 has not (yet?) passed through such a red supergiant phase.
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