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X-ray studies of coeval star samples. III - X-ray emission in the Ursa Major stream

1990; IOP Publishing; Volume: 351; Linguagem: Inglês

10.1086/168486

1538-4357

J. H. M. M. Schmitt, G. Micela, S. Sciortino, G. S. Vaiana, Jr. Harnden F. R., R. Rosner,

Astrophysics and Star Formation Studies

view Abstract Citations (40) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray studies of coeval star samples. III. X-ray emission in the UrsaMajor stream. Schmitt, J. H. M. M. ; Micela, G. ; Sciortino, S. ; Vaiana, G. S. ; Harnden, F. R., Jr. ; Rosner, R. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1990 DOI: 10.1086/168486 Bibcode: 1990ApJ...351..492S Keywords: Open Clusters; Stellar Rotation; X Ray Stars; Sky Surveys (Astronomy); Stellar Luminosity; Astrophysics full text sources ADS | data products SIMBAD (43) CDS (1) Related Materials (4) Part 1: 1985ApJ...292..172M Part 2: 1988ApJ...325..798M Part 3: 1990ApJ...348..557M Part 5: 1994ASPC...64..110M