The behaviour of Li abundance in the stars of different metallicities

T. V. Mishenina (1) , C. Soubiran (2, 3, 4)

1 Astronomical observatory of Odessa National University [Odessa]
2 OASU - Observatoire aquitain des sciences de l'univers
3 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
4 L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux

Using the method of spectral synthesis we derived the abundances of Li in the atmospheres of 100 stars in the range of metallicities ‑3{[Fe/H]{0.2. The investigated spectra are part of the library collected at the Haute Provence Observatory, they were obtained with the 193 cm telescope equipped with ELODIE spectrometer (R=42000). For the metal-poor dwarfs, in the "Spite plateau" region ([Fe/H]{‑1.7, Teff{>}5700 K) we obtain logA(Li){=}2.30{±}0.05, which is in a good agreement with the results of other authors. Our values of Li abundances do not indicate any trends either with Teff or with [Fe/H]. The "plateau" is also traced in the metallicity range ‑0.7{[Fe/H]{‑0.3. The behavior of the lithium abundance for stars with [Fe/H]{>}‑1.7, Teff{5700 K shows a depleting mechanism in these stars, the growth of its efficiency with an increase of the metallicity. The "lithium plateau" was also found for thick disk dwarfs with Teff}{>}5800 K.

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]; Planétologie et astrophysique de la terre [astro-ph.EP]

T. V. Mishenina, C. Soubiran. The behaviour of Li abundance in the stars of different metallicities. From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium Proceedings of the international Astronomical Union 228, Held in Paris, France, May 23-27, 2005. edited by Hill, V.; François, P.; Primas, F. Cambridge: Cambridge University Press, 2005., pp.97-98, 2005, Paris, France. pp.97-98, ⟨10.1017/S1743921305005338⟩. ⟨hal-00403556⟩