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Astron. Astrophys. 342, 756-762 (1999)

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Nitrogen abundance in early B-stars

I. NLTE calculations for [FORMULA] Pegasi

S.A. Korotin, S.M. Andrievsky and L.Yu. Kostynchuk

Department of Astronomy, Odessa State University, Shevchenko Park, 270014 Odessa, Ukraine (e-mail: skyline@max.odessa.ua; scan@deneb.odessa.ua)

Received 24 September 1998 / Accepted 3 November 1998

Abstract

Based on Kurucz (1992) grid of models the NLTE calculations of nitrogen abundance in [FORMULA] Peg atmosphere revealed a slight deficiency of this element comparably to solar value ([FORMULA]). Together with the recent result on carbon abundance in this star atmosphere ([FORMULA]; Korotin et al., 1998), the present determination shows that turbulent diffusion in massive main sequence stars (discussed by Maeder, 1987) and connected with it the appearance of the CN-processed material at the stellar surface can hardly be operating in [FORMULA] Peg.

The list of N ii lines that can be used for LTE calculation of nitrogen abundance in hot stars is also presented.

Key words: stars: abundances – stars: early-type – stars: individual: fl Peg

Send offprint requests to: Korotin S.A.

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© European Southern Observatory (ESO) 1999

Online publication: February 23, 1999
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