J/ApJ/325/798ivo://CDS.VizieR/J/ApJ/325/798doi:10.26093/cds/vizier.13250798CDSMicela G.Sciortino S.Vaiana G.S.Schmitt J.H.M.M.Stern R.A.,Harnden F.R.JrRosner R.1999-05-01T20:12:40Z1999-05-01T20:12:28ZCDS support team

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

cds-question@unistra.fropen-star-clustersemission-line-starsx-ray-sourcesThe paper reports the results of an extensive X-ray study of the Hyades region and improves on previous studies by using refined X-ray source detection algorithms and the complete set of Einstein Observatory IPC exposures covering the Hyades cluster region (a total of 63 1 x 1 deg images). Maximum likelihood integral X-ray luminosity functions were computed for the Hyades stars for given color index (B-V) ranges. The present results agree substantially with a previous survey about the ubiquity of the stellar activity in the Hyades cluster, especially among solar-type stars. The result of Stern et al. (1981ApJ...249..647S) that stellar X-ray emission is dependent on stellar age is confirmed.1988ApJ...325..798Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/325/798CatalogResearchIsServedByTAP 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/348/557 : Einstein Survey of the Pleiades ClusterJ/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/325/798https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/325/798http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/325/798https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/325/798https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/325/798http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/325/798GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/325/798/hyades_1 (EO Survey of Hyades Region: Observation Parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/325/798/hyades_1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/325/798/hyades_1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/325/798/hyades_1?GETtext/xml+votable180.050000true57.3674823.65159830.005555555555555556Cone search capability for table J/ApJ/325/798/hyades_2 (EO Survey of Hyades Stars: Optical Properties and X-ray Luminosities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/325/798/hyades_2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/325/798/hyades_2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/325/798/hyades_2?GETtext/xml+votable180.050000true57.4207824.316410.005555555555555556Einsteinhttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/325/798?format=asciiX-raydefaultJ/ApJ/325/798/hyades_1EO Survey of Hyades Region: Observation ParametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqnoSequence number (1)meta.id;meta.mainintf_Seqno[ a] "a" indicates data is merged (1)meta.code.errorcharRAB1950Right Ascension (B1950) (hour)pos.eq.ra;meta.mainDEB1950Declination (B1950) (deg)pos.eq.dec;meta.mainStartDateStart of observation (2)time.epochnullableStopDateEnd of observation (2)time.epochnullablelivetimeLive time of observation (3)kstime.duration;obs.exposurefloatJ/ApJ/325/798/hyades_2EO Survey of Hyades Stars: Optical Properties and X-ray LuminositiesNotesNotesmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharRAB1950Right Ascension (B1950) (hour)pos.eq.ra;meta.mainDEB1950Declination (B1950) (deg)pos.eq.dec;meta.mainVmagApparent visual magnitude (2)magphot.mag;em.opt.VfloatB-VB-V color index (2)magphot.color;em.opt.B;em.opt.Vfloatr_B-V? Reference for mv and/or B-V (2)meta.refintnullableSpSpectral type (3)src.spTypecharr_SpReference for spectral type, comma separated (3)meta.refcharVsiniEquatorial (rotational) velocities along line of sight (more than one value) (4)km/sphys.veloc.rotatcharr_VsiniReference for vsini. comma separated list (4)meta.refcharstatus[AB] "A" if Certainty about Hyades membership; "B" if "Potential" (9)meta.codecharVNameStar name (first name found in Name) (1)meta.idcharf_Lx[01] Flagged "1" if Lx is an upper limit (5)meta.code.errorcharLxX-ray luminosity from 0.16-4.0 keV (6)1e-07Wphys.luminosity;em.X-raydoublee_LxError for luminosity (6)1e-07Wstat.errordoubleflux_flgFlag indicating how flux was evaluated (7)meta.codecharrecoRibs and Edge Code flag (8)meta.code.qualcharJ/ApJ/325/798/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcodereference codemeta.bib.bibcodeintreftxtbibcode (if any) and reference textmeta.bib.bibcodechar