Abstract

view Abstract Citations (547) References (89) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Results from an extensive Einstein stellar survey. Vaiana, G. S. ; Cassinelli, J. P. ; Fabbiano, G. ; Giacconi, R. ; Golub, L. ; Gorenstein, P. ; Haisch, B. M. ; Harnden, F. R., Jr. ; Johnson, H. M. ; Linsky, J. L. ; Maxson, C. W. ; Mewe, R. ; Rosner, R. ; Seward, F. ; Topka, K. ; Zwaan, C. Abstract The preliminary results of the Einstein Observatory stellar X-ray survey are presented. To date, 143 soft X-ray sources have been identified with stellar counterparts, leaving no doubt that stars in general constitute a pervasive class of low-luminosity galactic X-ray sources. Stars along the entire main sequence, of all luminosity classes, pre-main sequence stars as well as very evolved stars have been detected. Early type OB stars have X-ray luminosities in the range 10 to the 31st to 10 to the 34th ergs/s; late type stars show a somewhat lower range of X-ray emission levels, from 10 to the 26th to 10 to the 31st ergs/s. Late type main-sequence stars show little dependence of X-ray emission levels upon stellar effective temperature; similarly, the observations suggest weak, if any, dependence of X-ray luminosity upon effective gravity. Instead, the data show a broad range of emission levels (about three orders of magnitude) throughout the main sequence later than F0. Publication: The Astrophysical Journal Pub Date: April 1981 DOI: 10.1086/158797 Bibcode: 1981ApJ...245..163V Keywords: Early Stars; Hertzsprung-Russell Diagram; Main Sequence Stars; Stellar Coronas; X Ray Sources; B Stars; Emission Spectra; O Stars; Stellar Gravitation; Stellar Luminosity; Stellar Temperature; White Dwarf Stars; Astronomy full text sources ADS | data products SIMBAD (183)