ROSAT X-ray luminosity functions of the Hyades dK and dM stars

Details ROSAT X-ray luminosity functions of the Hyades dK and dM stars ROSAT X-ray luminosity functions of the Hyades dK and dM stars

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..798p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 266, p. 798

Astronomy and Astrophysics

Astronomy

58

Rosat Mission, K Stars, M Stars, X Ray Stars, Dwarf Stars, Radiant Flux Density, Astronomical Catalogs, Binary Stars, Luminosity

Scientific paper

Long-duration ROSAT PSPC pointed observations of the Hyades open star cluster are performed. The Hyades dK and XLFs from the present observations are compared with published Einstein dK/dM XLFs. The Hyades dK binaries have significantly higher L(X) than the Hyades dK stars. However, all these binaries have relatively long periods (greater than about 1 yr), and hence the L(X) levels cannot be attributed to the enhanced activity expected in short-period, 'BY Dra-type' systems. It is also shown that the effect cannot be due simply to the summed luminosities of the component stars.

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