EDP Sciences
Free access
Issue
A&A
Volume 490, Number 1, October IV 2008
Page(s) 297 - 305
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:200810260
Published online 11 September 2008


A&A 490, 297-305 (2008)
DOI: 10.1051/0004-6361:200810260

Spectroscopic metallicities of Vega-like stars

C. Saffe1, M. Gómez2, O. Pintado3, and E. González4

1  Complejo Astronómico El Leoncito, CC 467, 5400 San Juan, Argentina
    e-mail: csaffe@casleo.gov.ar
2  Observatorio Astronómico de Córdoba, Laprida 854, 5000 Córdoba, Argentina
    e-mail: mercedes@oac.uncor.edu
3  Instituto Superior de Correlación Geológica (INSUGEO), 4000 Tucumán, Argentina
    e-mail: opintado@tucbbs.com.ar
4  Facultad de Ciencias Exactas, Físicas y Naturales (UNSJ), 5400 San Juan, Argentina
    e-mail: erip.p.a.gonzalez@gmail.com

Received 26 May 2008 / Accepted 1 August 2008

Abstract
Aims. We aim to determine the metallicities of 113 Southern Hemisphere Vega-like candidate stars in relation to the giant exoplanet host group and field stars.
Methods. We applied two spectroscopic methods of abundance determinations: equivalent width measurements together with the ATLAS9 model atmospheres and the WIDTH9 program, and a comparison of observed spectra with a grid of synthetic spectra.
Results. For the Vega-like group, the metallicities are indistinguishable from those of field stars not known to be associated with planets or disks. This result is quite different from the metallicities of giant exoplanet host stars, which are metal-rich in comparison to field stars.


Key words: techniques: spectroscopic -- stars: abundances -- stars: late-type



© ESO 2008