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Astron. Astrophys. 363, 228-238 (2000)

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Chemical analysis of 8 recently discovered extra-solar planet host stars *

N.C. Santos 1, G. Israelian 2 and M. Mayor 1

1 Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
2 Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain

Received 22 May 2000 / Accepted 8 August 2000


We present the chemical analysis of a new set of stars known to harbor low mass companions, namely HD 1237, HD 52265, HD 82943, HD 83443, HD 169830, and HD 202206. In addition, we have also analyzed HD 13445 and HD 75289, already studied elsewhere. The abundances of C and [FORMULA]-elements O, S, Si, Ca and Ti are presented and discussed in the context of the metallicity distribution of the stars with extra-solar planets. We compare the metallicity distribution of stars with planets with the same distribution of field dwarfs. The results further confirm that stars with planets are over-abundant in [Fe/H].

Key words: stars: abundances – stars: chemically peculiar – stars: planetary systems

* Based on observations collected at the La Silla Observatory, ESO (Chile), with the echelle spectrograph coralie at the 1.2-m Euler Swiss telescope

Send offprint requests to: Nuno.Santos@obs.unige.ch

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000