J/AJ/134/2398ivo://CDS.VizieR/J/AJ/134/2398doi:10.26093/cds/vizier.51342398CDSCovey K.R.Ivezic Z.Schlegel D.Finkbeiner D.Padmanabhan N.,Lupton R.H.Agueros M.A.Bochanski J.J.Hawley S.L.West A.A.Seth A.,Kimball A.Gogarten S.M.Claire M.Haggard D.Kaib N.Schneider D.P.,Sesar B.2010-04-24T17:56:45Z2010-04-04T15:48:53ZCDS support team

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

cds-question@unistra.frvisible-astronomysloan-photometryinfrared-photometryspectral-energy-distributionThe Sloan Digital Sky Survey (SDSS) and Two Micron All Sky Survey (2MASS) are rich resources for studying stellar astrophysics and the structure and formation history of the Galaxy. As new surveys and instruments adopt similar filter sets, it is increasingly important to understand the properties of the ugrizJHKs stellar locus, both to inform studies of "normal" main-sequence stars and enable robust searches for point sources with unusual colors. Using a sample of ~600000 point sources detected by SDSS and 2MASS, we tabulate the position and width of the ugrizJHKs stellar locus as a function of g-i color, and provide accurate polynomial fits. We map the Morgan-Keenan spectral type sequence to the median stellar locus by using synthetic photometry of spectral standards and by analyzing 3000 SDSS stellar spectra with a custom spectral typing pipeline, described in the Appendix to this paper. We develop an algorithm to calculate a point source's minimum separation from the stellar locus in a seven-dimensional color space, and use it to robustly identify objects with unusual colors, as well as spurious SDSS/2MASS matches.2007AJ....134.2398Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/134/2398CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/PASP/110/863 : A Stellar Spectral Flux Library: 1150-25000A (Pickles 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/134/2398https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/134/2398http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/134/2398https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/134/2398https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/134/2398http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/134/2398GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/134/2398/table3Synthetic SDSS/2MASS photometry of Pickles (1998, Cat. J/PASP/110/863) solar metallicity standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeMK spectral typesrc.spTypecharLClassLuminosity classsrc.class.luminositycharu-gThe (u-g) color indexmagphot.color;em.opt.U;em.opt.Bfloatg-rThe (g-r) color indexmagphot.color;em.opt.B;em.opt.Rfloatr-iThe (r-i) color indexmagphot.color;em.opt.R;em.opt.Ifloati-zThe (i-z) color indexmagphot.color;em.opt.I;em.opt.Ifloatz-JThe (z-J) color indexmagphot.color;em.IR;em.IRfloatJ-HThe (J-H) color indexmagphot.color;em.IR.J;em.IR.HfloatH-KsThe (H-Ks) color indexmagphot.color;em.IR.H;em.IR.KfloatJMAGAbsolute J band magnitudemagphys.magAbs;em.IR.JfloatJ/AJ/134/2398/table1Locus colors as a function of g-i colorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintg-iThe (g-i) color indexmagphot.colorfloatNstarsNumber of starsmeta.numberintu-gThe (u-g) color indexmagphot.color;em.opt.U;em.opt.Bfloate_u-gThe 1{sigma} error in u-gmagstat.errorfloatg-rThe (g-r) color indexmagphot.color;em.opt.B;em.opt.Rfloate_g-rThe 1{sigma} error in g-rmagstat.error;phot.color;em.opt.Bfloatr-iThe (r-i) color indexmagphot.color;em.opt.R;em.opt.Ifloate_r-iThe 1{sigma} error in r-imagstat.error;phot.color;em.opt.Rfloati-zThe (i-z) color indexmagphot.color;em.opt.I;em.opt.Ifloate_i-zThe 1{sigma} error in i-zmagstat.errorfloatz-JThe (z-J) color indexmagphot.color;em.IR;em.IRfloate_z-JThe 1{sigma} error in z-Jmagstat.errorfloatJ-HThe (J-H) color indexmagphot.color;em.IR.J;em.IR.Hfloate_J-HThe 1{sigma} error in J-Hmagstat.error;phot.color;em.IR.JfloatH-KsThe (H-Ks) color indexmagphot.color;em.IR.H;em.IR.Kfloate_H-KsThe 1{sigma} error in H-Ksmagstat.error;phot.color;em.IR.Hfloat