J/ApJ/836/202ivo://CDS.VizieR/J/ApJ/836/202doi:10.26093/cds/vizier.18360202CDSSpencer M.E.Mateo M.Walker M.G.Olszewski E.W.2017-12-13T19:32:38Z2017-11-06T10:00:03ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomysloan-photometryspectroscopyradial-velocitymetallicitygiant-starsWe conducted a large spectroscopic survey of 336 red giants in the direction of the Leo II dwarf galaxy using Hectochelle on the Multiple Mirror Telescope, and we conclude that 175 of them are members based on their radial velocities and surface gravities. Of this set, 40 stars have never before been observed spectroscopically. The systemic velocity of the dwarf is 78.3+/-0.6km/s with a velocity dispersion of 7.4+/-0.4km/s. We identify one star beyond the tidal radius of Leo II but find no signatures of uniform rotation, kinematic asymmetries, or streams. The stars show a strong metallicity gradient of -1.53+/-0.10dex/kpc and have a mean metallicity of -1.70+/-0.02dex.2017ApJ...836..202Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/202CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/360/185 : VI photometry of the Leo II galaxy (Bellazzini+, 2005)J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006)J/ApJ/649/201 : Veloc. & Washington photom. in Carina dSph (Munoz+, 2006)J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006)J/MNRAS/378/318 : Chemical abundances in Leo I and II dSph (Bosler+, 2007)J/AJ/133/270 : Metallicities and ages in Leo II dSph (Koch+, 2007)J/AJ/134/566 : Leo II stellar kinematics (Koch+, 2007)J/MNRAS/388/1185 : JHKs photometry of LeoII dSph giants (Gullieuszik+, 2008)J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)J/ApJ/675/201 : Radial velocities of stars near Leo I (Mateo+, 2008)J/AJ/137/3100 : Radial velocities of 4 dSph galaxies (Walker+, 2009)J/ApJS/191/352 : Abundances in stars of MW dwarf satellites (Kirby+, 2010)J/MNRAS/411/1013 : CaII triplet in Sextans dSph galaxy (Battaglia+, 2011)J/ApJ/741/100 : Proper motions of Leo II member stars (Lepine+, 2011)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/MNRAS/448/2717 : Bayesian analysis of resolved stellar spectrahttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/202https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/202http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/202https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/202https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/202http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/202GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/836/202/table3 (Spectroscopic properties of stars in the direction of Leo II)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/202/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/202/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/202/table3?GETtext/xml+votable180.050000true168.22874522.368030.005555555555555556Cone search capability for table J/ApJ/836/202/table1 (Photometric properties of stars in the direction of Leo II)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/202/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/202/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/202/table1?GETtext/xml+votable180.050000true168.3457522.15633330.0055555555555555566/28355 28361 283642.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/836/202?format=asciiOpticaldefaultJ/ApJ/836/202/table3Spectroscopic properties of stars in the direction of Leo IIHJDHeliocentric Julian Date; JD-2450000dtime.epochfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRVel[-95.2/280.2] Radial velocity (likely members have 57.7<RVel<101.2km/s)km/sphys.veloc;pos.heliocentricfloate_RVel[0.1/3] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatTeff[4321/7317] Effective temperatureKphys.temperature.effectiveinte_Teff[21/975] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[0.7/5.6] Log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)[0.04/1.4] Uncertainty in log(g)log(cm.s**-2)stat.errorfloat[Fe/H][-3.6/1.4] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.02/1] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.FefloatNobs[1/8] Number of observationsmeta.numberintMmMember of Leo II; "Y"=Yes (289 occurrences; 175 unique sources); or "N"meta.code.member;meta.id.parentcharCombSingle ("S") or combined ("C") measurementmeta.codecharPDisplay the photometric data for this sourcemeta.ref.urlintnullableJ/ApJ/836/202/table1Photometric properties of stars in the direction of Leo IIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmag[15.9/23.7] The g band magnitude (SDSS system)magphot.mag;em.opt.Bfloate_gmag[0.03/1.6] Uncertainty in gmagmagstat.error;phot.mag;em.opt.Bfloatimag[16.9/25.2] The i band magnitude (SDSS system)magphot.mag;em.opt.Ifloate_imag[0.02/1.4] Uncertainty in imagmagstat.error;phot.mag;em.opt.IfloatSDisplay the spectroscopic data for this sourcemeta.ref.urlintnullable