Lithium abundances in exoplanet-hosts stars

Details Lithium abundances in exoplanet-hosts stars Lithium abundances in exoplanet-hosts stars

2008-03-20

arxiv.org/abs/0803.3014v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, conference proceeding "XXI Century challenges for stellar evolution", Cefalu (Sicily, Italy), August 29 -

Scientific paper

Exoplanet-host stars (EHS) are known to present surface chemical abundances different from those of stars without any detected planet (NEHS). EHS are, on the average, overmetallic compared to the Sun. The observations also show that, for cool stars, lithium is more depleted in EHS than in NEHS. The overmetallicity of EHS may be studied in the framework of two different scenarii. We have computed main sequence stellar models with various masses, metallicities and accretion rates. The results show different profiles for the lithium destruction according to the scenario. We compare these results to the spectroscopic observations of lithium.

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