J/A+A/341/751ivo://CDS.VizieR/J/A+A/341/751doi:10.26093/cds/vizier.33410751CDSMicela G.Sciortino S.HarndenF.R.Jr.Kashyap V.Rosner R.,Prosser C.F.Damiani F.Stauffer J.Caillault J.-P.1999-12-19T19:48:17Z1999-12-19T20:48:10ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesphotometryIn a deep X-ray survey of the Pleiades open cluster, we use the ROSAT High Resolution Imager to explore a region of the cluster formerly surveyed with the PSPC. These new observations substantially improve upon both the sensitivity and the spatial resolution for this region of the Pleiades, allowing us to detect 18 cluster members not detected before and 16 members not included in the catalogs used in previous surveys. The high sensitivity of the present observations permits us to obtain more stringent upper limits for 72 additional members and also provides sufficient numbers of stars to enable us to explore the dependence of L_x_ on stellar rotation for the slow rotators of the Pleiades. Using the new high sensitivity X-ray observations and the recent rotational measurements we discuss the activity-rotation relationship in the Pleiades solar type stars. We also present new photometric observations of optical counterparts of a number of X-ray sources detected in previous surveys but not yet identified.1999A&A...341..751Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/341/751CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/90 : Positions of 502 Stars in Pleiades Region (Eichhorn+ 1970)I/163 : US Naval Observatory Pleiades Catalog (Van Flandern 1969)J/ApJS/91/625 : ROSAT survey of the Pleaides (Stauffer+ 1994)J/ApJS/102/75 : ROSAT Observations of the Pleiades (Micela+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/341/751https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/341/751http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/341/751https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/341/751https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/341/751http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/341/751GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/341/751/table2 (Optical properties of the observed Pleiades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/341/751/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/341/751/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/341/751/table2?GETtext/xml+votable180.050000true55.25791724.9230560.005555555555555556ROSAThttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/341/751?format=asciiX-raydefaultJ/A+A/341/751/table2Optical properties of the observed PleiadesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning Numbermeta.idintprimaryNameNamemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag? Visual Magnitudemagphot.mag;em.opt.Vfloatnullableu_VmagUncertainty flag on Vmagmeta.code.errorcharB-V? B-V color indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-Ik? V-Ik color indexmagphot.colorfloatnullableSpTypeSpectral typesrc.spTypecharl_vsiniLimit flag on vsinimeta.code.errorcharvsini? Projected rotational velocitykm/sphys.veloc.rotatfloatnullablePer? Rotational periodhtime.periodfloatnullableE(B-V)? Color excess (E(B-V))magphot.color.excessfloatnullableJ/A+A/341/751/table3X-ray properties of the observed Pleiadesl_RateLimit flag on Ratemeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning Numbermeta.idintprimaryNameNamemeta.id;meta.maincharoRA? Offset in right ascensionarcsecpos.eq.ra;arith.difffloatnullableoDE? Offset in declinationarcsecpos.eq.dec;arith.difffloatnullableS/N? Detection significance in sigma equivalentstat.snrfloatnullableRateX-ray count ratect/ksphot.count;em.X-rayfloate_Rate? Error in X-ray count ratect/ksstat.errorfloatnullablel_log(Lx)Limit flag on log(Lx)meta.code.errorcharlog(Lx)X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatn_log(Lx)[)] Note on log(Lx) (1)meta.notecharl_log(Lx/Lb)Limit flag on log(Lx/Lb)meta.code.errorcharlog(Lx/Lb)? X-ray to bolometric luminosity ratiophys.luminosity;arith.ratiofloatnullablen_log(Lx/Lb)[)] Note on log(Lx/Lb) (1)meta.notecharFieldField where the source has been detectedobs.fieldcharoffaxisDistance from the center of the field of viewarcminpos.angDistancefloat