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Astron. Astrophys. 351, 168-176 (1999)


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Oxygen abundances in early B-stars *

S.A. Korotin 1, S.M. Andrievsky 1 and R.E. Luck 2

1 Department of Astronomy, Odessa State University, Shevchenko Park, 270014, Odessa, Ukraine (skyline@eurocom.od.ua; scan@deneb.odessa.ua)
2 Department of Astronomy, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-7215, USA (luck@fafnir.astr.cwru.edu)

Received 29 April 1999 / Accepted 16 September 1999

Abstract

Kurucz atmospheric models and a modified version of the MULTI code are applied in a NLTE investigation of the OII spectrum. It is shown that previously performed analyses based on the use of lightly line-blanketed Gold models give results that are in variance with those based on the use of the more heavily blanketed Kurucz models.

One result of our calculations is a number of useful relationships between the NLTE oxygen abundance, line equivalent width, and stellar atmospheric parameters.

A NLTE analysis of O II lines in a sample of hot main sequence B stars has been performed. The derived oxygen abundances for the program stars appear to be subsolar. A brief comparison is presented between the oxygen abundance in B stars and other related stellar types.

Key words: atomic processes – line: formation – line: profiles – stars: abundances – stars: atmospheres – stars: early-type

* Based on spectra collected with the 1.52-m telescope of Haute Provence Observatoire

Send offprint requests to: S.A. Korotin

© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999

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