J/A+AS/131/197ivo://CDS.VizieR/J/A+AS/131/197CDSMetanomski A.D.F.Pasquini L.Krautter J.Cutispoto G.Fleming T.A.2021-12-15T08:12:40Z1998-08-11T17:14:52ZCDS support team

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

cds-question@unistra.frradio-sourceslate-type-starsinfrared-photometryvisible-astronomyWide-band photometryWe present accurate BV(RI)c photometry for a sample of F, G and K stars detected in selected areas of the ROSAT all-sky survey (RASS). We have used the photometry, in addition to low-resolution spectroscopy, to estimate spectral classifications, distances and X-ray luminosities. The log(L_X_/L_V_) in the sample lies below -2. Although the sample contains also nearby, inactive stars, it is dominated by active objects. The median X-ray luminosity in our sample is <L_X_>=29.88 and the mean value of the hardness ratios <HR1>=0.13+/-0.35. We compare the derived X-ray luminosity function with similar functions obtained from the serendipitous samples of the Einstein Observatory medium sensitivity survey (EMSS, Cat. <IX/15>) and EXOSAT (Cat. <J/A+AS/115/41>). Our sample is completely consistent with the EMSS sample of solar type stars, indicating that both our sources and the EMSS sources are representative of the high galactic latitude X-ray stellar population. We do not find extremely active stars (log(L_X_)>=32), as are found in the EMSS sample, and we argue that these objects are rare.1998A&AS..131..197Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/131/197CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)IX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)J/ApJS/99/701 : EMSS (Fleming+ 1995)J/A+AS/115/41 : UBV(RI) photometry of cool stars (Cutispoto+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/131/197https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/131/197http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/131/197https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/131/197https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/131/197http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/131/197GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/131/197/table3 (Summary of X-ray and observational data as well as results for the studied sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/131/197/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/131/197/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/131/197/table3?GETtext/xml+votable180.050000true341.638333-39.4791670.005555555555555556ROSAT6/8202 16393 16469 16645 16651 16655 16675 16679 16691 24715 24738 25090-25091 25106 25113 25115-25116 25118 25130 25135 25919 25923 25930 25934 25944 25949 25953 25971 25973 25990-25991 25996 26003 26010-26012 26020 26050 33799 33807 33814-33818 33826 33829 33836 33838 33844 33848-33849 33865 33869 33874-33875 33878 33880 33884 33886 33892 33896 33902 33921-33922 35254 35413 35421 35423 35432 35442 35450 35483 35497 35501 35507-35509 35520 35536 35588 35591 35600 35617 35753 38390 38738 38740 38742 38747 38774 46438 46489 46520 46538 465463.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/131/197?format=asciiOpticalInfraredRadiodefaultJ/A+AS/131/197/table3Summary of X-ray and observational data as well as results for the studied sampleNameCounterpart namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXJROSAT namemeta.id;meta.maincharn_RXJ[*] *: see note detailed in file notes.datmeta.notecharRAXX-ray source right ascension (J2000.0)pos.eq.raDEXX-ray source declination (J2000.0)pos.eq.decCountsCount-rate for the X-ray sourcect/sphot.count;em.X-raydoubleTexpTotal exposition timestime.duration;obs.exposurefloatHR1? Hardness Ratio 1 (1)phot.flux;arith.ratiofloatnullableRAJ2000Counterpart right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Counterpart declination (J2000.0)pos.eq.dec;meta.mainDX-CDistance between X-ray and counterpart positionsarcsecpos.angDistancefloatSpTypeSpectral typesrc.spTypecharn_SpTypeNote on Spectral type for binaries (2)meta.notecharDistDistance of the star from the Sunpcpos.distance;pos.heliocentricintE_Dist? Error in Distance (upper limit)pcstat.error;stat.maxintnullablee_Dist? Error in Distance (lower limit)pcstat.errorintnullablefXX-ray flux1e-15W.m**-2phot.flux;em.X-rayfloatE_fXError in fX (upper limit)1e-15W.m**-2stat.error;stat.maxfloate_fXError in fX (lower limit)1e-15W.m**-2stat.errorfloatLXX-ray luminosity1e+22Wphys.luminosity;em.X-rayfloatE_LXError in LX (upper limit)1e+22Wstat.error;stat.maxfloate_LXError in Lx (lower limit)1e+22Wstat.errorfloatSpTypeOCounterpart spectral typesrc.spTypecharVmagCounterpart V magnitudemagphot.mag;em.opt.VfloatB-VCounterpart B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-R? Counterpart V-R colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? Counterpart V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+AS/131/197/notesIndividual notesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRXJSource namemeta.id;meta.maincharNtotTotal number of lines for the RXJ objectmeta.numberintNlineRunning line number in range [1,Ntot]meta.idintNoteText of the notemeta.notechar