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Title:
Results from an extensive Einstein stellar survey
Authors:
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.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Palermo, Osservatorio Astronomico, Palermo, Italy), AB(Washburn Observatory, University of Wisconsin, Madison), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AE(Harvard- Smithsonian Center for Astrophysics, Cambridge, Mass.), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AG(Joint Institute for Laboratory Astrophsics, University of Colorado and National Bureau of Standards), AH(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AI(Lockheed Palo Alto Research Laboratory), AJ(Joint Institute for Laboratory Astrophsics, University of Colorado and National Bureau of Standards; Staff Member, Quantum Physics Division, National Bureau of Standards), AK(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AL(The Astronomical Institute, Utrecht, the Netherlands), AM(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AN(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AO(Harvard- Smithsonian Center for Astrophysics, Cambridge, Mass.), AP(The Astronomical Institute, Utrecht, the Netherlands)
Publication:
Astrophysical Journal, Part 1, vol. 244, Apr. 1, 1981, p. 163-182. Research supported by the Consiglio Nazionale delle Ricerche; (ApJ Homepage)
Publication Date:
04/1981
Category:
Astronomy
Origin:
STI
NASA/STI 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
DOI:
10.1086/158797
Bibliographic Code:
1981ApJ...245..163V

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.

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