Abstract
We present Walraven photometry and ROSAT All-Sky Survey data for a sample of 173 bright main- sequence stars with spectral types between A8V and G2V. These observations are part of a study of the onset of magnetic surface activity along the main sequence. Values for the eective temperature, surface gravity and inter- stellar reddening have been obtained from a comparison of the observed Walraven colours with theoretical val- ues. These parameters have been used to derive accurate X-ray surface flux densities.
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