Results from an extensive Einstein stellar survey

Details Results from an extensive Einstein stellar survey Results from an extensive Einstein stellar survey

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..163v&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Apr. 1, 1981, p. 163-182. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

452

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

Scientific paper

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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