Statistical properties of the GALEX spectroscopic stellar sample

Abstract

The GALEX General Data Release 4/5 includes 174 spectroscopic tiles, obtained from slitless grism observations, for a total of more than 60,000 ultraviolet spectra. We have determined statistical properties of the sample of GALEX stars. We have defined a suitable system of spectroscopic indices, which measure the main mid-UV features at the GALEX low spectral resolution and we have employed it to determine the atmospheric parameters of stars in the range 4500T eff 9000 K. Our preliminary results indicate that the majority of the sample is formed by main sequence F-and G-type stars, with metallicity [M/H] −1 dex.