Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..128...29p&link_type=abstract
Astronomy and Astrophysics Supplement, v.128, p.29-33
Astronomy and Astrophysics
Astrophysics
3
Stars: Activity, Fundamental Parameters, X-Rays: Stars
Scientific paper
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 effective temperature, surface gravity and interstellar reddening have been obtained from a comparison of the observed Walraven colours with theoretical values. These parameters have been used to derive accurate X-ray\ surface flux densities.
Paradijs Jan van
Piters J. M. A.
Schmitt Juergen H. M. M.
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