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F, G and K stars in the ROSAT all-sky survey. I. Photometry
Pasquini, L.; Krautter, J.; Cutispoto, G. +2 more
We present accurate BV(RI)_c photometry for a sample of F, G and K stars detected in selected areas of the ROSAT all-sky survey (RASS). We have used the photometry, in addition to low-resolution spectroscopy, to estimate spectral classifications, distances and X-ray luminosities. The log (L_X / L_V) in the sample lies below -2. Although the sample…