Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..316v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 316-332.
Astronomy and Astrophysics
Astrophysics
23
A Stars, Cyano Compounds, Oxygen Compounds, Stellar Evolution, Stellar Interiors, Supergiant Stars, Abundance, Charge Coupled Devices, Massive Stars, Signal To Noise Ratios
Scientific paper
The study presents results for three massive (about 10-solar masses), Population I A-type supergiants: HD 13476 (A3 Iab), HD 46300 (A0 Ib), and HD 87737 (A0 Ib). Atmospheric parameters (T(eff) and gravity) are determined from spectroscopic indicators. Observed H-gamma profiles are compared to those generated from Kurucz's (1979, 1990) line-blanketed model atmospheres, and ionization equilibrium of MgI/Mg II is used to choose the final model parameters. These A supergiants are found to have roughly solar metal abundances. There are large enrichments of nitrogen, accompanied by slight carbon and possibly oxygen depletions. The nitrogen enhancements indicate a complex chemical evolutionary history for the stars, or a systematic error in the classical analysis of N I lines in A supergiant atmospheres, e.g., large non-LTE corrections.
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