J/AJ/113/806ivo://CDS.VizieR/J/AJ/113/806doi:10.26093/cds/vizier.51130806CDSGizis J.E.2023-04-06T16:50:25Z1998-08-31T13:42:54ZCDS support team

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

cds-question@unistra.frm-starsspectroscopyradial-velocitypopulation-ii-starssubdwarf-starsphotometryWe present a spectroscopic classification system for M-dwarfs and M-subdwarfs based on quantitative measures of TiO and CaH features in the region 6200 - 7400 Angstroms. Our sample of cool stars covers the range from solar metallicity stars to the most extreme subdwarfs known. Using synthetic spectra computed by Allard and Hauschildt (1995), we derive metallicities for the stars. Stars are classified as dwarfs (M V), subdwarfs (sdM), or extreme subdwarfs (esdM). These classifications correspond to [m/H] = 0.0, -1.2, and -2.0 respectively. Our metallicity scale agrees with theoretical HR diagrams and HST globular cluster measurements. We discuss some nearby subdwarfs of particular interest in light of our metallicity scale. We include photometry compiled from the literature.1997AJ....113..806Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/113/806CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/198 : PMSU (Palomar/MSU nearby star spectroscopic survey; Hawley+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/113/806https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/113/806http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/113/806https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/113/806https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/113/806http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/113/806GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/113/806/table2Spectroscopic observations (table 2)LHS*Number in LHS catalogmeta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName*Other namemeta.id;meta.maincharTiO5TiO5 index: F(7126-7135)/F(7042-7046)spect.indexfloatCaH1CaH1 index: F(6380-6390)/F (6345-6355,6410-6420))spect.indexfloatCaH2CaH2 index: F(6814-6846)/F(7042-7046)spect.indexfloatCaH3CaH3 index: F(6960-6990)/F(7042-7046)spect.indexfloatRV*Radial Velocitykm/sphys.veloc;pos.heliocentricfloatSpSpectral typesrc.spTypecharcode*Telescope codemeta.codecharJ/AJ/113/806/table4Photometry (table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLHSNumber in LHS catalogmeta.id;meta.maincharprimaryVApparent V magnitudemagphot.mag;em.opt.VfloatB-V? B-V colormagphot.color;em.opt.B;em.opt.VfloatnullableV-R? V-R (Cousins) colormagphot.color;em.opt.V;em.opt.RfloatnullableR-I? R-I (Cousins) colormagphot.color;em.opt.R;em.opt.IfloatnullableV-I? V-I (Cousins) colormagphot.color;em.opt.V;em.opt.IfloatnullablePlx? Trigonometric parallaxarcsecpos.parallax.trigfloatnullablee_Plx? Uncertainty {sigma} of parallaxarcsecstat.errorfloatnullableDeltaLK*? Lutz-Kelker correctionmagphot.mag;arith.difffloatnullableMV*? Absolute V magnitudemagphys.magAbs;em.optfloatnullableref*Source of parallax and photometrymeta.refchar