Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..492s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 492-499. Research supported by the Max-Planck-Gesel
Astronomy and Astrophysics
Astronomy
37
Open Clusters, Stellar Rotation, X Ray Stars, Sky Surveys (Astronomy), Stellar Luminosity
Scientific paper
Results are reported from a comprehensive survey of X-ray emission from stars known or suspected to be members of the UMa cluster and/or stream. Of the 42 UMa member stars surveyed, 18 were detected as X-ray sources, and spectral analysis was performed for 10 stars with sufficient X-ray counts. Consideration is given to relations between X-ray luminosity, color, and kinematics of the sample stars, and the X-ray spectra of the UMa stars are discussed in the context of the general problem of stellar X-ray temperatures. Also confirmed is the lack of X-ray-emitting A dwarfs among UMa members; among stars of later spectra type there is a rather large dispersion in X-ray luminosity. This dispersion cannot readily be explained by contamination with field star interlopers and appears rather to be a property of the UMa X-ray luminosity distribution function.
Harnden Frank R. Jr.
Micela Giuseppina
Rosner Robert
Schmitt Juergen H. M. M.
Sciortino Salvatore
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