Spectroscopic investigation of SDSS J100921.40+375233.9 selected from SDSS and GALEX photometry

In this study, we aim to reveal the nature of the Sloan Digital Sky Survey (SDSS) star: SDSS J100921.40+375233.9, suspected to have an extremely low metallicity. We observed this star at high spectral resolution and performed an abundance analysis. We derived the spectroscopic parameters Teff =5820+-125 K, log g = 3.9+-0.2, and xi = 1.1+-0.5 km/s. The star is consistent with belonging to the thick disk.