J/ApJ/723/1632ivo://CDS.VizieR/J/ApJ/723/1632doi:10.26093/cds/vizier.17231632CDSNorris J.E.Wyse R.F.G.Gilmore G.Yong D.Frebel A.Wilkinson M.I.,Belokurov V.Zucker D.B.2017-07-06T06:25:46Z2012-08-16T13:24:34ZCDS support team

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

cds-question@unistra.frchemical-abundancesgalaxiesvisible-astronomysloan-photometrygiant-starsradial-velocityWe present an AAOmega spectroscopic study of red giants in the ultra-faint dwarf galaxy Bootes I (M_V_~-6) and the Segue 1 system (M_V_~-1.5), either an extremely low luminosity dwarf galaxy or an unusually extended globular cluster. Both Bootes I and Segue 1 have significant abundance dispersions in iron and carbon. Bootes I has a mean abundance of [Fe/H]=-2.55+/-0.11 with an [Fe/H] dispersion of {sigma}=0.37+/-0.08, and abundance spreads of {Delta}[Fe/H]=1.7 and {Delta}[C/H]=1.5. Segue 1 has a mean of [Fe/H]=-2.7+/-0.4 with [Fe/H] dispersion of {sigma}=0.7+/-0.3, and abundances spreads of {Delta}[Fe/H]=1.6 and {Delta}[C/H]=1.2. Moreover, Segue 1 has a radial-velocity member at four half-light radii that is extremely metal-poor and carbon-rich, with [Fe/H]=-3.5, and [C/Fe]=+2.3. Modulo an unlikely non-member contamination, the [Fe/H] abundance dispersion confirms Segue 1 as the least-luminous ultra-faint dwarf galaxy known.2010ApJ...723.1632Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/723/1632CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/ApJ/692/1464 : Spectroscopy of Segue 1 (Geha+, 2009)J/MNRAS/380/281 : Faint Galactic satellites survey (Martin+, 2007)J/AJ/117/981 : Estimation of stellar metal abundance. II. (Beers+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/723/1632https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/723/1632http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/723/1632https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/723/1632https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/723/1632http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/723/1632GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/723/1632/stars (Observational data and derived heliocentric velocities for stars in the Bootes I and Segue 1 fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/723/1632/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/723/1632/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/723/1632/stars?GETtext/xml+votable180.050000true209.759708314.50644440.0055555555555555565/1104 2186 6/4425 8738 8739 8748 8750https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/723/1632?format=asciiOpticaldefaultJ/ApJ/723/1632/memberObservational data and derived atmospheric parameters for candidate member stars of Bootes I and Segue 1SeqStar numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalSimbad column added by the CDSmeta.id.parentcharf_Seq[cde] Question about membership (1)meta.codecharRad[2.1/48.8] Radius from centerarcminphys.angSizefloatHRV[94/216] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintgmag[17.52/19.3] SDSS-DR4 g-band magnitudemagphot.mag;em.opt.Bfloat(g-r)0Corrected (g-r) color indexmagphot.color;em.opt.B;em.opt.Rfloat(r-z)0? Corrected (r-z) color indexmagphot.colorfloatnullableK'? CaII K line-strength index (K') defined by Beers et al. (1999, Cat. J/AJ/117/981)0.1nmspect.line.intensityfloatnullableTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]? Abundance of [Fe/H]log(Sun)phys.abund.Fefloatnullablef_[Fe/H][abcgh] Origin of [Fe/H] (1)meta.codechar[C/H]? Abundance of [C/H]log(Sun)phys.abundfloatnullable[C/Fe]? Abundance of [C/Fe]log(Sun)phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/723/1632/starsObservational data and derived heliocentric velocities for stars in the Bootes I and Segue 1 fieldsMmSimbad column added by the CDSmeta.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalSimbad column added by the CDSobs.fieldcharSeqIdentification numbermeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maingmag[17.25/21.49] SDSS-DR4 g band magnitudemagphot.mag;em.opt.BfloatimagSDSS-DR4 i band magnitudemagphot.mag;em.opt.IfloatXpixX pixel locationarcminpos.cartesian.x;instr.detfloatYpixY pixel locationarcminpos.cartesian.y;instr.detfloatRad[2.1/60] Radius from centerarcminphys.angSizefloatHRV[-207/327] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintMem?[y/n] Candidate member? (1)meta.code.membercharDR7+DR8Link to SDSS-DR7 and -DR8 photometric catalogs within 1.5"meta.ref.urlcharSloanDisplay the SDSS online data for this starmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar