| Issue | A&A Volume414, Number2, February I 2004 | |
|---|---|---|
| Page(s) | 601 - 611 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20034398 | |
| Published online | 19 January 2004 | |
Lithium in stars with exoplanets*
G. Israelian1,N. C. Santos2,3,M. Mayor3 andR. Rebolo1
1 Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
2 Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
3 Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
Corresponding author: G. Israelian, gil@iac.es
Received: 25 September 2003
Accepted: 7 October 2003
We present a comparison of the lithium abundances of stars withand without planetary-mass companions. New lithium abundancesare reported in 79 planet hosts and 38 stars from a comparison sample.When the Li abundances of planet host stars are compared with the 157 starsin the sample of field stars of Chen et al. ([CITE]) we find that the Li abundancedistribution is significantly different, and that there is a possible excess ofLi depletion in planet host stars with effective temperatures in the range 5600–5850 K, whereaswe find no significant differences in the temperature range 5850–6350 K. We have searched for statistically significant correlations between the Li abundanceof parent stars and various parameters of the planetary companions. We do notfind any strong correlation, although there are may be a hintof a possible gap in the Li distribution of massive planet host stars.
Key words:stars: abundances / stars: chemically peculiar / stars: planetary systems
Based on observations collected at the La Silla Observatory, ESO (Chile), with the CORALIE spectrograph at the 1.2 m Euler Swiss telescope, and with the FEROS spectrograph at the 1.52 m ESO telescope, and using the UES spectrograph at the 4.2 m William Herschel Telescope (WHT) and SARG spectrograph at the 3.5 m Telescopio Nazional Galileo on La Palma (Canary Islands).
© ESO, 2004
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