Abundances of C, N, O, and other elements in the atmospheres of the δ Scuti variables 14 Aur, δ Sct, and HD 127986

Details Abundances of C, N, O, and other elements in the atmospheres of the δ Scuti variables 14 Aur, δ Sct, and HD 127986 Abundances of C, N, O, and other elements in the atmospheres of the δ Scuti variables 14 Aur, δ Sct, and HD 127986

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44..227r&link_type=abstract

Astronomy Reports, Volume 44, Issue 4, April 2000, pp.227-234

Astronomy and Astrophysics

Astronomy

3

Scientific paper

Using high-resolution spectra, we have determined the abundances of carbon (logɛ(C)), nitrogen (logɛ(N)), oxygen (logɛ(O)), silicon (logɛ(Si)), sulphur (logɛ(S)), and some other elements for three δ Scuti stars. Logɛ(C) for all three stars and logɛ(N) for δ Sct and HD 127986 are close to the solar values, while there appears to be a slight (0.15 dex) nitrogen deficiency for 14 Aur. The logɛ(O) values correspond to a 0.30-dex deficiency for 14 Aur and δ Sct and a 0.20-dex deficiency for HD 127986. The values of logɛ(Si) for the three stars are close to solar, and the logɛ(S) values indicate a slight deficiency (0.10 dex) for 14 Aur and HD 127986 and a 0.20-dex excess for δ Sct. Comparison of the elemental abundances for seven δ Scuti stars with those for Am stars shows that the mean deficiencies of C, N, and O are smaller for pulsating δ Scuti stars than for Am stars with similar effective temperatures. The sulphur abundances are virtually the same for both types of stars.

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