Relations among stellar X-ray emission observed from Einstein, stellar rotation and bolometric luminosity

Details Relations among stellar X-ray emission observed from Einstein, stellar rotation and bolometric luminosity Relations among stellar X-ray emission observed from Einstein, stellar rotation and bolometric luminosity

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..279p&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 279-290. Research supported by the Consiglio Nazionale delle Richerc

Astronomy and Astrophysics

Astronomy

497

Bolometers, Heao 2, Stellar Luminosity, Stellar Rotation, X Ray Astronomy, X Ray Stars, Chromosphere, Early Stars, F Stars, Hertzsprung-Russell Diagram, Late Stars, Main Sequence Stars, Stellar Coronas

Scientific paper

The correlation between observed stellar X-ray luminosities, bolometric luminosities, and projected rotational velocities for stars of various spectral types and luminosity classes are determined. Early type stars (O3 to A5) have X-ray luminosities independent of rotational velocities, and correlating with bolometric luminosities. Late type stars of spectral type G to M have luminosities well correlated to equatorial rotational velocities, and are independent of luminosity class. The dependence of late type stars is found to be equivalent to a relation between the X-ray surface flux and the stellar angular velocity. F stars are intermediate with X-ray luminosities higher than would be predicted on the basis of the early type star relation, although lower than expected from the late type velocity dependence. The location of RS CVn stars as a class is also discussed, and it is found that the heating of late type stellar coronas does not result from direct conversion of ratational energy.

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