Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...73...67r&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 73, May 1990, p. 67-102. Research supported by the Robert A. Welc
Astronomy and Astrophysics
Astrophysics
76
Carbon, Main Sequence Stars, Nitrogen, Oxygen, Peculiar Stars, Stellar Composition, A Stars, Magnetic Stars, Stellar Atmospheres, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
Low-noise, high-resolution Reticon spectra are used to obtain C, N, and O abundances for chemically peculiar stars with surface temperatures between 7,000 and 15,000 K. The analysis includes C I, C II, N I, and O I lines for 13 Am and related stars, nine Hg-Mn stars, 15 magnetic Ap stars, and five standard stars. The C and O abundances show a roughly monotonic increase with surface temperature. The C and O results are in general agreement with radiative diffusion theory. The N abundances, however, show that N is slightly deficient in cool nonmagnetic stars and very deficient above 10,000 K in nonmagnetic stars. The results for N disagree with simple diffusion predictions, suggesting that a more detailed model is needed for partially ionized N near the stellar surface.
Lambert David L.
Roby Scott W.
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