MISHENINA, T. V.; BELIK, S. I.; USENKO, I. A.; BIENAYME, O.; SOUBIRAN, C.; KOVTYUKH, V. V.; KOROTIN, S. A.

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MISHENINA, T. V.
Astronomical observatory of Odessa National University [Odessa]

BELIK, S. I.
Odessa Astronomical Observatory

USENKO, I. A.
Odessa Astronomical Observatory

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Ce document a été publié dans

Odessa Astronomical Publications. 2007, vol. 20, p. 143

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Résumé en anglais

Atmospheric parameters (Teff , log g, [Fe/H], Vt), Li, and volatile (O, Na, Al, Zn) and refractory (Si, Ti, V, Cr, Co and Ni) element abundances in 133 stars belonging to the low part of MS have been determined. Among them about 30 stars are the variable stars of BY Dra type, for which the determination of the chemical composition was made for the first time. The effective temperatures Teff were estimated by the line depth ratio method. The surface gravities log g were determined by two methods (ionization balance of iron and using parallaxes). The abundances of lithium and oxygen were determined by the calculation of synthetic spectrum. The comparison of volatile and refractory element abundances in variable stars and other stars was made. We have found that the behaviour of the abundances of the majority of elements in MS stars and spotted stars does not differ. The Li is detected in 65 % BY Dra stars and in 26 % of MS stars. The Li abundance in variable stars is higher than in MS dwarfs.< Réduire

Mots clés en anglais

stars: BY Dra type.

Stars: fundamental parameters

stars: abundances

stars: main -sequence

stars: BY Dra type

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Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804