Using a high resolution spectrum of the secondary star in the black hole binary A0620 - 00 , we have derived the stellar parameters and veiling caused by the accretion disk in a consistent way .
We have used a \chi ^ { 2 } minimization procedure to explore a grid of 800 000 LTE synthetic spectra computed for a plausible range of both stellar and veiling parameters .
Adopting the best model parameters found , we have determined atmospheric abundances of Fe , Ca , Ti , Ni and Al .
The Fe abundance of the star is \mathrm { [ Fe / H ] } = 0.14 \pm 0.20 .
Except for Ca , we found the other elements moderately over-abundant as compared with stars in the solar neighborhood of similar iron content .
Taking into account the small orbital separation , the mass transfer rate and the mass of the convection zone of the secondary star , a comparison with element yields in supernova explosion models suggests a possible explosive event with a mass cut comparable to the current mass of the compact object .
We have also analyzed the Li abundance , which is unusually high for a star of this spectral type and relatively low mass .