Optical study of F, G and K stars in the ROSAT All-Sky Survey
I analyze a sample of 107 southern stars of spectral types A to K, which were identified as the optical counterparts of X-ray sources detected by ROSAT during its All-Sky Survey. The study is conducted using optical observations, photometric as well as spectroscopic (high-resolution). Various parameters are determined for the sample objects, mainly spectral types and luminosity classes, absolute magnitudes, distances, radial velocities, projected rotational velocities, effective temperatures, Lithium abundances. I compare the X-ray parameters of my sample stars with those of a similar sample, detected by the Einstein Observatory during its Medium Sensitivity Survey (EMSS). I also look for correlations between the different stellar parameters determined for my sample, and compare those results to those obtained for the EMSS sample, and also to some results obtained from other, earlier studies.
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