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Issue A&A
Volume 389, Number 2, July II 2002
Page(s) 519 - 523
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20020645



A&A 389, 519-523 (2002)
DOI: 10.1051/0004-6361:20020645

Sodium enrichment of stellar atmospheres

I. Non-variable supergiants and bright giants
S. M. Andrievsky1, 2, 3, I. A. Egorova1, 3, S. A. Korotin1, 3 and R. Burnage4

1  Department of Astronomy, Odessa State University, Shevchenko Park, 65014 Odessa, Ukraine
    e-mail: serkor@skyline.od.ua; egorova@deneb.odessa.ua
2  Instituto Astronômico e Geofísico, Universidade de São Paulo, Av. Miguel Stefano, 4200 Agua Funda, Brasil
3  Odessa Astronomical Observatory and Isaac Newton Institute of Chile, Odessa Branch, Ukraine
4  Observatoire de Haute-Provence, 04870 Saint-Michel l'Observatoire, France

(Received 24 December 2001 / Accepted 15 April 2002 )

Abstract
48 supergiants and bright giants have been observed in order to investigate the sodium enrichment of their atmospheres and its connection with stellar gravity. We present the equivalent widths of the 6154 Å  and 6160 Å  $\ion{Na}{i}$ lines measured from the program spectra, the results of effective temperature determinations, the NLTE sodium abundances, and the derived relation between the sodium overabundance and surface gravity.


Key words: stars: abundances -- stars: supergiants

Offprint request: S. M. Andrievsky, scan@deneb.odessa.ua

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© ESO 2002


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