J/ApJ/351/492ivo://CDS.VizieR/J/ApJ/351/492doi:10.26093/cds/vizier.13510492CDSSchmitt J.H.M.M.Micela G.Sciortino S.Vaiana G.S.Harnden F.R.,Rosner R.2013-03-05T06:33:46Z1999-05-01T22:20:55ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fropen-star-clustersemission-line-starsx-ray-sourcesResults 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 spectral 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.1990ApJ...351..492Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/351/492CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/315/687 X-Ray emission from solar-type stars: F and Ghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/351/492https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/351/492http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/351/492https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/351/492https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/351/492http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/351/492GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/351/492/st_uma_1 (X-ray Emssion in the Ursa Major Stream: X-ray Results and Optical Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/351/492/st_uma_1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/351/492/st_uma_1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/351/492/st_uma_1?GETtext/xml+votable180.050000true14.303330723.41791950.005555555555555556Einstein6/177 1521 2660 4297 7763 8687 8717 8767 8790 9072 9874 10741 11109 11202 11206 11225 11888 12523 13494 19022 19921 20940 21060 21568 22822 23323 24151 24793 26381 27581 27930 31716 31929 36081 38095 40408 44015 48519https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/351/492?format=asciiX-raydefaultJ/ApJ/351/492/st_uma_1X-ray Emssion in the Ursa Major Stream: X-ray Results and Optical PropertiesSpSpectral type (7)src.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHRHR (Bright Star Catalog) number (1)meta.idintHDHD (Henry Draper Catalog) number (1)meta.id;meta.mainintprimaryinstInstrument (2)meta.id;instrcharSeqnoSequence Number (2)meta.idintf_CCRFlagged "1" if count rate is an upper limit (3)meta.codeintCCRCorrected Count Rate (3)ct/ksphot.count;em.X-rayfloate_CCRError on count rate (3)ct/ksstat.errorfloatmethodDetect method (4)stat.fitcharlogLxLog of X-ray luminosity from 0.16-4.0 keV (5)log(1e-07W)phys.luminosity;em.X-rayfloatnoteNotes on the source (6)meta.notecharRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.mainDistDistance to star (7)pcpos.distancefloatB-VB-V color index (7)magphot.color;em.opt.B;em.opt.VfloatUU velocity (8)km/sphys.veloc;pos.cartesian.xfloatVV velocity (8)km/sphys.veloc;pos.cartesian.yfloatWW velocity (8)km/sphys.veloc;pos.cartesian.zfloatRhoVelocity (8)km/sphys.velocfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/351/492/st_uma_3X-ray Emission in the Ursa Major Stream: Temperature FitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Henry Draper Catalog) number (1)meta.id;meta.mainintprimarySeqnoSequence number (2)meta.idintntempsNumber of temperature components in fit (3)meta.numberintlogT1log T for low-temperature component (4)log(K)arith.zpfloate_logT1Downward 68% confidence error (4)log(K)stat.errorfloatE_logT1Upward 68% confidence error (4)log(K)stat.error;stat.maxfloatlogT2log T for high-temperature component (4)log(K)arith.zpfloate_logT2Downward 68% confidence error (4)log(K)stat.errorfloatE_logT2Upward 68% confidence error (4)log(K)stat.error;stat.maxfloatchi2Reduced chi-square (5)stat.fit.chi2floatem1d2Emission measure (6)1e+49cm**-3.pc**-2phys.emissMeasurefloatem2d2Emission measure (6)1e+49cm**-3.pc**-2phys.emissMeasurefloatlogLx1log X-ray luminosity from 0.16-4.0 keV (7)log(1e-07W)phys.luminosity;em.X-rayfloatlogLx2log X-ray luminosity from 0.16-4.0 keV (7)log(1e-07W)phys.luminosity;em.X-rayfloat