Volume 418, Number 2, May I 2004
|Page(s)||703 - 715|
|Section||Stellar structure and evolution|
|Published online||09 April 2004|
Nitrogen abundances in planet-harbouring stars
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
2 Centro de Astronomia e Astrofisica de Universidade de Lisboa, Observatorio Astronomico de Lisboa, Tapada de Ajuda, 1349-018 Lisboa, Portugal
3 Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
4 Departamento de Astrofísica, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez s/n, 38206 La Laguna, Tenerife, Spain
5 INAF/Osservatorio Astrofisico di Arcetri, Largo Fermi 5, 50125 Firenze, Italy
Corresponding author: A. Ecuvillon, firstname.lastname@example.org
Accepted: 4 February 2004
We present a detailed spectroscopic analysis of nitrogen abundances in 91 solar-type stars, 66 with and 25 without known planetary mass companions. All comparison sample stars and 28 planet hosts were analysed by spectral synthesis of the near-UV NH band at 3360 Å observed at high resolution with the VLT/UVES, while the near-IR N i 7468 Å was measured in 31 objects. These two abundance indicators are in good agreement. We found that nitrogen abundance scales with that of iron in the metallicity range [Fe/H] with the slope . Our results show that the bulk of nitrogen production at high metallicities was coupled with iron. We found that the nitrogen abundance distribution in stars with exoplanets is the high [Fe/H] extension of the curve traced by the comparison sample of stars with no known planets. A comparison of our nitrogen abundances with those available in the literature shows a good agreement.
Key words: stars: abundances / stars: chemically peculiar / stars: evolution / stars: planetary systems / Galaxy: solar neighbourhood
© ESO, 2004
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