EDP Sciences
Free access
Issue
A&A
Volume 418, Number 2, May I 2004
Page(s) 703 - 715
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20035717


A&A 418, 703-715 (2004)
DOI: 10.1051/0004-6361:20035717

Nitrogen abundances in planet-harbouring stars

A. Ecuvillon1, G. Israelian1, N. C. Santos2, 3, M. Mayor3, R. J. García López1, 4 and S. Randich5

1  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

(Received 20 November 2003 / Accepted 4 February 2004 )

Abstract
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 -0.6 < [Fe/H]  <+0.4 with the slope $1.08 \pm 0.05$. 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

Offprint request: A. Ecuvillon, aecuvill@ll.iac.es

SIMBAD Objects



© ESO 2004

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.