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Astron. Astrophys. 350, 598-602 (1999)

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Carbon and nitrogen abundances in early B-stars

I. NLTE calculations for a sample of stars with small v sin i values *

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

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 28 April 1999 / Accepted 26 August 1999

Abstract

Abundances of carbon and nitrogen in a sample of hot main sequence stars were determined in the NLTE approximation. All calculations were based on Kurucz atmosphere models. Atmospheric parameters for the program stars have been determined using spectroscopic and photometric methods.

In most cases the derived atmospheric abundances appear to be subsolar and probably unaltered by stellar evolution. This is in agreement with the general conclusions on C and N abundances for B main sequence stars reached by other investigators.

Key words: stars: abundances – stars: atmospheres – stars: early-type

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

Send offprint requests to: S.A. Korotin

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© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999
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