Abundance analyses of peculiar early-type stars

Details Abundance analyses of peculiar early-type stars Abundance analyses of peculiar early-type stars

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982iraj...15..318d&link_type=abstract

Irish Astronomical Journal (ISSN 0021-1052), vol. 15, Sept. 1982, p. 318-323. Research supported by the Science and Engineering

Astronomy and Astrophysics

Astronomy

Abundance, Cosmochemistry, Early Stars, Peculiar Stars, Helium, Main Sequence Stars, Nitrogen, Stellar Spectra, Supergiant Stars

Scientific paper

Spectrographic observations of two groups of nitrogen-weak OBC stars obtained with the 1.9-m SAAO telescope are reported and analyzed. Coudespectrograms of three supergiants in a loose association characterized by Feinstein (1964) were obtained in the 3400-4900-A range with dispersions of 6.8-15.5 A/mm on baked IIa-O plates which were reduced on a digitized microdensitometer for line-profile and equivalent-width measurements. Spectra of 20 young main-sequence stars in NGC 6231 in the 3600-5000-A range were recorded with dispersions of 30-50 A/mm using a Cassegrain spectrograph and an image photon-counting system. Stellar atmospheric parameters were estimated by comparing the observed features with those predicted by LTE and non-LTE models and then used to perform abundance analyses. The significant N deficiency observed in both groups is attributed to the interstellar material from which the stars were formed, and the He underabundance reported by Nissen (1974) for NGC 6231 suggests that nuclear processing via the CNO bi-cycles has not taken place.

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