Carbon and nitrogen abundances in the BN supergiant HD 93840, and their implications for normal Galactic supergiants

Details Carbon and nitrogen abundances in the BN supergiant HD 93840, and their implications for normal Galactic supergiants Carbon and nitrogen abundances in the BN supergiant HD 93840, and their implications for normal Galactic supergiants

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..188m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. 188-198.

Astronomy and Astrophysics

Astrophysics

9

Abundance, Carbon, Nitrogen, Photosphere, Supergiant Stars, Ultraviolet Spectra, Early Stars, Line Spectra, Silicon, Stellar Atmospheres

Scientific paper

It is demonstrated how carbon and nitrogen abundances of luminous B stars can be determined by a combined analysis of their UV photospheric and wind lines. It is shown that HD 93840 has nearly the same temperature and surface gravity as the normal B1 Ib star Zeta Per. These two stars are compared on the basis of their UV photospheric silicon spectra and the differences in their photospheric CNO and metallic lines are discussed. A quantitative comparison between the wind profiles of the two stars is made. A simple model for the compositions of both atmospheres is used to derive the fraction of material in each atmosphere which has undergone CNO processing. It is argued that the enriched material must have resided in a nuclear burning core for only a very short time. Best estimates of 0.09 + or - 0.07 and 0.90 + or - 0.1 are made for the carbon abundances relative to cosmic ones for HD 93840 and Zeta Per, respectively.

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