J/ApJ/348/557ivo://CDS.VizieR/J/ApJ/348/557doi:10.26093/cds/vizier.13480557CDSMicela G.Sciortino S.Vaiana G.S.Harnden F.R.Rosner R.,Schmitt J.H.M.M.2013-03-05T06:33:42Z1999-05-01T20:29:34ZCDS support team

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

cds-question@unistra.fropen-star-clustersemission-line-starsx-ray-sourcesCoronal X-ray emission of the Pleiades stars is investigated, and maximum likelihood, integral X-ray luminosity functions are computed for Pleiades members in selected color-index ranges. A detailed search is conducted for long-term variability in the X-ray emission of those stars observed more than once. An overall comparison of the survey results with those of previous surveys confirms the ubiquity of X-ray emission in the Pleiades cluster stars and its higher rate of emission with respect to older stars. It is found that the X-ray emission from dA and early dF stars cannot be proven to be dissimilar to that of Hyades and field stars of the same spectral type. The Pleiades cluster members show a real rise of the X-ray luminosity from dA stars to early dF stars. X-ray emission for the young, solar-like Pleiades stars is about two orders of magnitude more intense than for the nearby solar-like stars.1990ApJ...348..557Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/348/557CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/315/687 : X-Ray emission from solar-type stars: F and GJ/ApJ/348/253 : Einstein Survey of Late-type Giant and Supergiant StarsJ/ApJ/325/798 : Einstein Survey of Hyades-cluster RegionJ/ApJ/351/492 : X-ray Emission in the Ursa Major Streamhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/348/557https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/348/557http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/348/557https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/348/557https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/348/557http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/348/557GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/348/557/pleiad_1 (EO Survey of the Pleiades: Optical Properties and X-ray Luminosities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/348/557/pleiad_1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/348/557/pleiad_1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/348/557/pleiad_1?GETtext/xml+votable180.050000true55.6670723.98960.005555555555555556Cone search capability for table J/ApJ/348/557/pleiad_2 (EO Survey of the Pleiades: Observation Parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/348/557/pleiad_2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/348/557/pleiad_2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/348/557/pleiad_2?GETtext/xml+votable180.050000true55.9514619.657310.005555555555555556Einstein5/115 118 6/379 382 405 448 465 466 467 470 476 478 485 496https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/348/557?format=asciiX-raydefaultJ/ApJ/348/557/pleiad_1EO Survey of the Pleiades: Optical Properties and X-ray LuminositiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.mainVmag? Apparent Visual magnitude (2)magphot.mag;em.opt.Vfloatnullabler_VmagReference for visual magnitude (3)meta.ref;pos.framecharB-VB-V color index (2)magphot.color;em.opt.B;em.opt.VfloatSpSpectral type (2)src.spTypecharr_Sp? Reference for spectral type (3)meta.refcharVsini? Equatorial (rotational) velocities along line of sight (2)km/sphys.veloc;pos.eqcharr_Vsini? Reference for vsini Comma separated list (3)meta.refcharnotesNotes on the source (4)meta.notecharf_Lx[01] "1" if luminosity is an upper limit (5)meta.codecharLxlog of X-ray luminosity from 0.16-4.0 keV (5)log(1e-07W)phys.luminosity;em.X-rayfloate_LxPercentage-error on X-ray luminosity (5)%stat.errorfloatflx_flgFlag indicating how flux was evaluated (6)meta.code.error;phot.fluxcharreco[ Y] Ribs and Edge Code flag (7)meta.codechar_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/348/557/pleiad_2EO Survey of the Pleiades: Observation ParametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqnoSequence Number (1)meta.id;meta.mainintRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.mainDateObservation Date (2)time.epoch;obscharliveLive Time (3)kstime.duration;obs.exposurefloatObsOriginal Einstein Observer (2)obs.observerchar_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/348/557/refsFiles with referencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcodereference codemeta.bib.bibcodecharreftxtreference textmeta.bibchar