J/ApJ/315/687ivo://CDS.VizieR/J/ApJ/315/687doi:10.26093/cds/vizier.13150687CDSMaggio A.Sciortino S.Vaiana G.S.Majer P.Bookbinder J.Golub L.,Harnden F.R.JrRosner R.2013-03-05T06:33:24Z1999-05-01T19:47:59ZCDS support team

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

cds-question@unistra.frdwarf-starsf-starsx-ray-sourcesResults of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival analysis techniques, the stellar X-ray luminosity function in the 0.15-4.0 keV energy band for both single and multiple sources. It is shown that the difference in X-ray luminosity between these two classes of sources is consistent with the superposition of individual components in multiple-component systems, whose X-ray properties are similar to those of the single-component sources. The X-ray emission of the stars in our sample is well correlated with their chromospheric CA II H-K line emission and with their projected equatorial rotational velocity. Comparison of the X-ray luminosity function constructed for the sample of the dG stars of the local population with the corresponding functions derived elsewhere for the Hyades, the Pleiades, and the Orion Ic open cluster confirms that the level of X-ray emission decreases with stellar age.1987ApJ...315..687Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/315/687CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/348/253 : Einstein Survey of Late-type Giant and Supergiant StarsJ/ApJ/325/798 : Einstein Survey of Hyades-cluster RegionJ/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/315/687https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/315/687http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/315/687https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/315/687https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/315/687http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/315/687GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/315/687/gstars_1 (EO Survey of Solar-type Stars: Optical Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/315/687/gstars_1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/315/687/gstars_1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/315/687/gstars_1?GETtext/xml+votable180.050000true0.640690.278410.005555555555555556Einstein6/377 2381 3020 3102 4029 4895 5413 5836 6066 7763 7869 8663 8845 9072 9092 9403 9476 10225 10375 10899 11534 12592 12944 14531 14650 16952 17219 17425 17730 17754 17812 18090 19585 19923 20145 21568 23190 23230 24151 24160 24178 25966 26521 26906 26975 27255 28605 28646 31132 31478 32070 32645 34192 34446 34817 38421 38955 40242 40932 41763 42285 45669https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/315/687?format=asciiX-raydefaultJ/ApJ/315/687/gstars_1EO Survey of Solar-type Stars: Optical PropertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar-name (1)meta.id;meta.maincharprimaryHD? HD/DM (Henry Draper Catalog) number (1)meta.numbercharHRHR (Bright Star Catalog) number (1)meta.idintOnameOther Name (1)meta.idcharSpSpectral class (2)src.spTypecharMabsAbsolute visual magnitude (2)magphys.magAbs;em.opt.VfloatB-VB-V color index (2)magphot.color;em.opt.B;em.opt.VfloatDistDistance (2)pcpos.distancefloatRemRemarks (3)meta.notecharRAB1950Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Declination (B1950)pos.eq.dec;meta.main_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/315/687/gstars_2EO Survey of Solar-type Stars: X-ray FluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharprimarymult[SM] Multiplicity flag (1)meta.code.multipcharSeqnoIPC sequence number (2)meta.idintf_fx[01] "1" if X-ray flux is an upper limit (3)meta.codecharfxX-ray flux in the 0.16-4.0 keV band (3)1e-16W.m**-2phot.flux;em.X-rayfloatRemarkNumeric reference to remarks from the published table (4)meta.notecharJ/ApJ/315/687/gstars_3EO Survey of Solar-type Stars: X-ray LuminositiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharprimaryf_lxFlag on lx (2)meta.codecharLxlog of X-ray luminosity from 0.15 - 4.0 keV (2)log(1e-07W)phys.luminosity;em.X-rayfloatl_Age[ >] limit flag on age (3)meta.code.error;time.agecharAge? yrs Age in Giga-years (3)Gyrtime.agefloatnullabler_AgeReference for age (3)meta.ref;pos.framecharVsiniRotational velocity (4)km/sphys.veloc.rotatfloate_VsiniError on rotational velocity (4)km/sstat.error;phys.veloc.rotatfloatr_VsiniReference for rotational velocity (4)meta.refcharVeqEquatorial velocity (5)km/sphys.veloc;pos.eqfloatr_VeqReference for Equatorial velocity (5)meta.ref;pos.framechar