J/AJ/105/226ivo://CDS.VizieR/J/AJ/105/226doi:10.26093/cds/vizier.51050226CDSSODERBLOM D.R.MAYOR M.2023-04-06T16:49:26Z1997-12-09T20:01:33ZCDS support team

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

cds-question@unistra.frstellar-populationsstellar-spectral-typestwo-color-diagramsspectroscopyline-intensitiesThe Ursa Major Group (UMaG) is studied as a test case for the authenticity of Stellar Kinematic Groups, using Coravel radial velocities, recent compilations of astrometric data and new spectroscopic observations. Spectroscopic age indicators, particularly indices of the strength of chromospheric emission, are applied to solar-type candidate members of UMaG, and it is shown that stars that meet the spectroscopic criteria also have kinematics that agree better with the space motions of the nucleus of UMaG than does the starting sample as a whole. The primary limitation on the precision of kinematics is now parallaxes instead of radial velocities. These more restrictive kinematic criteria are then applied to other UMaG candidates and a list summarizing membership is presented. UMaG is also examined as a cluster, confirming its traditional age of 0.3 Gyr and a mean [Fe/H] of -0.08 +/- 0.09 for those stars most likely to be bona fide members.1993AJ....105..226Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/105/226CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/105/226https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/105/226http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/105/226https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/105/226https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/105/226http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/105/226GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/105/226/table1Stellar kinematic groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGroup namemeta.id;meta.maincharUU space velocitykm/sphys.velocintVV space velocitykm/sphys.velocintWW space velocitykm/sphys.velocintRefReferencesmeta.refcharJ/AJ/105/226/table3Echelle spectroscopy of UMaG candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharl_vsinilimit flag on vsinimeta.code.errorcharvsini[]? Rotational velocitykm/sphys.veloc.rotatfloatl_WHalphaLimit flag on Walphameta.code.errorcharWHalpha[]? Equivalent width of Halpha line0.1pmspect.line.eqWidthfloatl_W8498Limit flag on W8498meta.code.errorcharW8498[]? Equivalent width of 8498A feature0.1pmspect.line.eqWidthfloatl_W8542Limit flag on W8542meta.code.errorcharW8542[]? Equivalent width of 8542A feature0.1pmspect.line.eqWidthfloatl_W8662Limit flag on W8662meta.code.errorcharW8662Equivalent width of 8662A feature0.1pmspect.line.eqWidthfloatl_RHalphaLimit flag on RHalphameta.code.errorcharlog(RHalpha)[]? Chromospheric flux ratio (stellar surface flux divided by bolometric flux) for Halphaphot.flux;arith.ratiofloatu_RHalphaUncertainty flag (only for star HD 141003B)meta.code.errorcharl_R8498Limit flag on R8498meta.code.errorcharlog(R8498)[]? Chromospheric flux ratio for 8498A featurephot.flux;arith.ratiofloatl_R8542Limit flag on R8542meta.code.errorcharlog(R8542)[]? Chromospheric flux ratio for 8542A featurephot.flux;arith.ratiofloatl_R8662Limit flag on R8662meta.code.errorcharlog(R8662)Chromospheric flux ratio for 8662A featurephot.flux;arith.ratiofloatJ/AJ/105/226/table5Spectroscopic membership indicators for UMaG solar-type starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMember[abc] a: Probable spectroscopic member b: Possible spectroscopic member c: Probable spectroscopic non-membermeta.code.membercharWooleyNumber in catalog of Woolley, et al. (1970)meta.idcharHD/HDEHenry Draper numbermeta.id;meta.mainintm_HD/HDEMultiplicity index on HD or HDE numbermeta.code.multipcharHR[]? Harvard Revised (Bright Star) numbermeta.idintm_HRMultiplicity index on HR numbermeta.code.multipcharNameOther namemeta.idcharSpSpectral type (1)src.spTypecharB-V[]? (B-V) color from Nicolet (1978) or Woolley et al. (1970)magphot.color;em.opt.B;em.opt.Vfloatu_B-Vuncertainty flag on B-Vmeta.code.errorcharTeff[]? Effective temperatureKphys.temperature.effectiveintu_Teffuncertainty flag on Teffmeta.code.errorcharl_R'[<H] limit flag on R'(HK). An 'H' indicating that Log(R') is instead an eye estimate of H and K emission strength from Wilson & Woolley (1970)meta.code.errorcharlogR'[]? Chromospheric flux ratio of the Ca II H and K emission featuresphot.flux;arith.ratiofloatu_logR'uncertainty flag on R'meta.code.errorcharn_R(hk)[I] An 'I', indicating logR(hk) is an I(Mg II) valuemeta.notecharlogR(hk)[]? Rescaled index, the Mg II h and k emission flux divided by the stellar bolometric flux and reduced to the scale of the Ca II H and K emission in logR'phot.flux;arith.ratiofloatl_R(TR)limit flag on R(TR)meta.code.errorcharlogR(TR)[]? Rescaled index, the emission flux of three strong features in IUE spectra (N I 1240 A, Si IV 1400 A, and C IV 1550 A) combined to produce an index of emission from the star's transition region (TR), reduced to the scale of the Ca II H and K lines as aspect.indexfloatl_R(Halpha)uncertainty flag on R(Halpha)meta.code.errorcharlogR(Halpha)[]? Rescaled index, logR(Halpha).spect.indexfloatu_R(Halpha)rms uncertainty on R(Halpha)meta.code.errorcharl_R(IRT)uncertainty flag on R(IRT)meta.code.errorcharlogR(IRT)[]? Rescaled index, for the Ca II infrared triplet.spect.indexfloatl_vsinilimit flag on vsinimeta.code.errorcharvsini[]? Rotational velocitykm/sphys.veloc.rotatfloate_vsini[]? rms uncertainty in v sin ikm/sstat.errorfloatJ/AJ/105/226/table7Kinematics of UMaG solar-type candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharplxParallax from the latest Yale Parallax Catalog (van Altena et al. 1992)maspos.parallax.trigfloate_plx[]? rms uncertainty on plxmasstat.errorfloatpmRAProper motion in right ascension from the Catalog of Positons and Proper Motions (PPM, Roeser & Bastian 1989)mas/yrpos.pm;pos.eq.rainte_pmRArms uncertainty on pmRAmas/yrstat.errorfloatpmDEProper motion in declination from the PPMmas/yrpos.pm;pos.eq.decinte_PMDErms uncertainty on pmDEmas/yrstat.errorfloatRV[]? Radial velocity from Evans (1980)km/sphys.veloc;pos.heliocentricfloate_RV[]? rms uncertainty on RVkm/sstat.errorfloatU[]? Resultant U component of space motionkm/sphys.velocfloate_U[]? rms uncertainty on Ukm/sstat.errorfloatV[]? Resultant V component of space motionkm/sphys.velocfloate_V[]? rms uncertainty on Vkm/sstat.errorfloatW[]? Resultant W component of space motionkm/sphys.velocfloate_W[]? rms uncertainty on Wkm/sstat.errorfloatplx2[]? Parallax the star must have if V is forced to a value of +2.0 km/s, given its observed radial velocity RV (table7 only)maspos.parallax.trigfloatMV2[]? Absolute visual magnitude that follows from the parallax plx2 (table7 only)magphys.magAbs;em.optfloatRV2[]? Radial velocity that results if the parallax is held fixed and the space motion V is forced to +2.0 km/s (table7 only)km/sphys.veloc;pos.heliocentricfloatU2[]? U space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only)km/sphys.velocfloatW2[]? W space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only)km/sphys.velocfloatJ/AJ/105/226/table10Kinematics of additional UMaG candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharplxParallax from the latest Yale Parallax Catalog (van Altena et al. 1992)maspos.parallax.trigfloate_plx[]? rms uncertainty on plxmasstat.errorfloatpmRAProper motion in right ascension from the Catalog of Positons and Proper Motions (PPM, Roeser & Bastian 1989)mas/yrpos.pm;pos.eq.rainte_pmRArms uncertainty on pmRAmas/yrstat.errorfloatpmDEProper motion in declination from the PPMmas/yrpos.pm;pos.eq.decinte_PMDErms uncertainty on pmDEmas/yrstat.errorfloatRV[]? Radial velocity from Evans (1980)km/sphys.veloc;pos.heliocentricfloate_RV[]? rms uncertainty on RVkm/sstat.errorfloatU[]? Resultant U component of space motionkm/sphys.velocfloate_U[]? rms uncertainty on Ukm/sstat.errorfloatV[]? Resultant V component of space motionkm/sphys.velocfloate_V[]? rms uncertainty on Vkm/sstat.errorfloatW[]? Resultant W component of space motionkm/sphys.velocfloate_W[]? rms uncertainty on Wkm/sstat.errorfloatplx2[]? Parallax the star must have if V is forced to a value of +2.0 km/s, given its observed radial velocity RV (table7 only)maspos.parallax.trigfloatMV2[]? Absolute visual magnitude that follows from the parallax plx2 (table7 only)magphys.magAbs;em.optfloatRV2[]? Radial velocity that results if the parallax is held fixed and the space motion V is forced to +2.0 km/s (table7 only)km/sphys.veloc;pos.heliocentricfloatU2[]? U space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only)km/sphys.velocfloatW2[]? W space velocity derived from using the observed radial velocity RV2 and the parallax plx2 (table7 only)km/sphys.velocfloatJ/AJ/105/226/table11Summary of UMaG membershiprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMember+ = Probable Members, ? = Possible Members (1)meta.code.membercharHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharHR[]? Harvard Revised numbermeta.idintm_HRMultiplicity index on HR numbermeta.code.multipcharNameOther namemeta.idcharSpSpectral typesrc.spTypecharB-V(B-V) colormagphot.color;em.opt.B;em.opt.VfloatTeffEffective temperatureKphys.temperature.effectiveintMvAbsolute visual magnitudemagphys.magAbs;em.optfloatRemRemarksmeta.notechar