On the carbon overabundance in the OBC-type stars

Details On the carbon overabundance in the OBC-type stars On the carbon overabundance in the OBC-type stars

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..129l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, July 1983, p. 129-139.

Astronomy and Astrophysics

Astronomy

6

Abundance, B Stars, Carbon Stars, O Stars, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Emission Spectra, H Alpha Line, Nitrogen, Radial Velocity, Spectral Line Width, Stellar Envelopes

Scientific paper

Spectra obtained at intermediate dispersion with a photon counting detector in the blue and red spectral regions are presented for three southern OBC-type stars: HD 104565 (O9.7 Ia), HD 96248 (B1.5 Iab) and HD 75860 (B2 Iab). All display broad Hα emission features. Equivalent widths for several lines are tabulated and radial velocities determined. A survey of the available observational data on the members of the OBC group strongly suggests the presence of extended atmospheres in these stars. The relevance of these observations to the interpretation of the OBC phenomenon is discussed.

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