Metalicidad de Estrellas de Tipo Vega

SAFFE, CARLOS; GÓMEZ, MERCEDES

Boletín de la Asociación Argentina de Astronomía

Asociación Argentina de Astronomía

Lugar: La Plata; Año: 2007 vol. 50 p. 145 - 148

1669-9521

We present spectroscopic metallicities for more than 100 candidate Vega-like stars, with BAFGK spectral types, 40 of which have been confirmed by SPITZER. We used more than 400 spectra taken atCASLEO, with the REOSC spectrograph in cross-dispersion mode. Themetallicity was derived by two methods. First, we used Kurucz (1992)model atmospheres, together with the measure of Fe lines equivalentwidths. Then, we compared observed spectra with a grid of syntheticspectra (Munari et al. 2005), aplying the Downhill method (Gray 2001).We derived solar metallicites (median=−0.15 dex) for the sample of candidate Vega-like stars, independent of the spectral type.