Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf stars

Details Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf stars Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf stars

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..687m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 687-699. Research supported by the Smithsonian Astr

Astronomy and Astrophysics

Astronomy

104

Dwarf Stars, Emission Spectra, F Stars, G Stars, Late Stars, Spaceborne Astronomy, Stellar Spectrophotometry, X Ray Stars, Calcium, Data Reduction, Heao 2, Hertzsprung-Russell Diagram, Open Clusters, Pleiades Cluster, Radiant Flux Density, Statistical Analysis

Scientific paper

Results of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival analysis techniques, the stellar X-ray luminosity function in the 0.15-4.0 keV energy band for both single and multiple sources. It is shown that the difference in X-ray luminosity between these two classes of sources is consistent with the superposition of individual components in multiple-component systems, whose X-ray properties are similar to those of the single-component sources. The X-ray emission of the stars in our sample is well correlated with their chromospheric CA II H-K line emission and with their projected equatorial rotational velocity. Comparison of the X-ray luminosity function constructed for the sample of the dG stars of the local population with the corresponding functions derived elsewhere for the Hyades, the Pleiades, and the Orion Ic open cluster confirms that the level of X-ray emission decreases with stellar age.

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