Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..760h&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 760-767.
Astronomy and Astrophysics
Astrophysics
57
Proportional Counters, Radiant Flux Density, Stellar Luminosity, Stellar Magnitude, X Ray Sources, Background Radiation, Imaging Techniques, Stellar Evolution, Stellar Rotation, Stellar Spectra
Scientific paper
To determine the X-ray luminosity function of normal stars, 1700 stars brighter than 10th magnitude were surveyed by the imaging proportional counter aboard the Einstein Observatory. Seventy star positions were found to contain excess X-ray counting rates. The number of stars per square degree in a number of magnitude intervals was calculated as a function of spectral type and luminosity class, and the total number of stars for each spectral type brighter than magnitude 9.5 derived in this manner was compared with the 1700-star sample. The agreement is good, as is that between the surface density of soft X-ray sources and the number of stellar emitters predicted from the field star survey. It is concluded that stars probably do not contribute significantly to the diffuse soft X-ray background. The findings are consistent with the notion that stellar age and/or rotation velocity are important determinants of stellar X-ray emission level.
Caillault Jean-Pierre
Helfand David J.
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