J/AJ/127/1579ivo://CDS.VizieR/J/AJ/127/1579doi:10.26093/cds/vizier.51271579CDSBriley M.M.Cohen J.G.Stetson P.B.2021-02-01T06:06:07Z2006-03-08T07:04:56ZCDS support team

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

cds-question@unistra.frglobular-star-clusterschemical-abundancesphotometryBuilding upon earlier observations that demonstrate substantial star-to-star differences in the carbon abundances of M13 subgiants, we present new Keck LRIS spectra reaching more that 1.5mag below the M13 main-sequence turnoff (to V~20). Our analysis reveals a distribution of C abundances similar to that found among the subgiants, implying little change in the compositions of the M13 stars at least through the main-sequence turnoff. We presume these differences to be the result of some process operating early in the cluster history. Additional spectra of previously studied bright M13 giants have been obtained with the 5m Hale Telescope.2004AJ....127.1579Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/127/1579CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/122/3219 : M3 and M13 CCD BV photometry (Rey+, 2001)J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)J/A+AS/144/227 : BV photometry of M71 (Geffert+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/127/1579https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/127/1579http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/127/1579https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/127/1579https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/127/1579http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/127/1579GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/127/1579/table3 (M13 Current Program Stars: Photometry, Indices, and Abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/1579/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/1579/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/1579/table3?GETtext/xml+votable180.050000true250.337916736.39694440.005555555555555556Cone search capability for table J/AJ/127/1579/table5 (M71 Subgiants from Briley & Cohen (2001AJ....122..242B): Program Stars, Photometry, Indices, and Abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/1579/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/1579/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/1579/table5?GETtext/xml+votable180.050000true298.402689118.75817830.005555555555555556Cone search capability for table J/AJ/127/1579/table4 (M13 Subgiants from Briley & Cohen (2002ApJ...579L..17B): Program Stars, Photometry, Indices, and Abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/1579/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/1579/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/1579/table4?GETtext/xml+votable180.050000true250.345833336.43444440.0055555555555555566/9436 10460 129432.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/127/1579?format=asciidefaultJ/AJ/127/1579/table3M13 Current Program Stars: Photometry, Indices, and AbundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BCS2004]Star identification, "MMSSs_MMSS" for position 16:MM:SS.s +36:MM:SSmeta.id;meta.maincharVmagThe Johnson V-band magnitudemagphot.mag;em.opt.VfloatIcmagThe Cousins I-band magnitudemagphot.mag;em.opt.IfloatV-IcThe (V-Ic) color indexmagphot.color;em.opt.V;em.opt.IfloatI(CH)Cohen ( 1999AJ....117.2434C) CH index (1)spect.indexfloatsNH? Briley & Smith (1993PASP..105.1260B) NH indexspect.indexfloatnullable[C/Fe]? Logarithm of the carbon-to-iron abundancephys.abundfloatnullable[N/Fe]? Logarithm of the nitrogen-to-iron abundancephys.abundfloatnullable_RAPosition (derived from the [BCS2004] name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (derived from the [BCS2004] name) (declination part)degpos.eq.dec;meta.mainJ/AJ/127/1579/table5M71 Subgiants from Briley & Cohen (2001AJ....122..242B): Program Stars, Photometry, Indices, and AbundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BCS2004]Star identification, "CMMSSs+MMSS for position 19:MM:SS.s +18:MM:SSmeta.id;meta.maincharRcmagThe Cousins R-band magnitudemagphot.mag;em.opt.RfloatB-RcThe (B-Rc) band magnitudemagphot.color;em.opt.B;em.opt.RfloatI(CH)Cohen (1999AJ....117.2434C) CH index (1)spect.indexfloatS(3839)The S(3839) indexspect.indexfloat[C/Fe]? Logarithm of the carbon-to-iron abundancephys.abundfloatnullable[N/Fe]? Logarithm of the nitrogen-to-iron abundancephys.abundfloatnullable_RABcompPosition from [BCS2004] (see also Cohen 1999AJ....117.2434C) (right ascension part)degpos.eq.ra;meta.main_DEBcompPosition from [BCS2004] (see also Cohen 1999AJ....117.2434C) (declination part)degpos.eq.dec;meta.main_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedJ/AJ/127/1579/table4M13 Subgiants from Briley & Cohen (2002ApJ...579L..17B): Program Stars, Photometry, Indices, and AbundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BCS2004]Star identification, "MMSSs_MMSS" for position 16:MM:SS.s +36:MM:SSmeta.id;meta.maincharVmag? The Johnson V-band magnitudemagphot.mag;em.opt.VfloatnullableIcmagThe Cousins I-band magnitudemagphot.mag;em.opt.IfloatV-Ic? The (V-Ic) color indexmagphot.color;em.opt.V;em.opt.IfloatnullableI(CH)Cohen (1999AJ....117.2434C) CH index (1)spect.indexfloat[C/Fe]? Logarithm of the carbon-to-iron abundancephys.abundfloatnullablef_[C/Fe][a] when [C/Fe] is absent (2)meta.codechar_RAPosition (derived from the [BCS2004] name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (derived from the [BCS2004] name) (declination part)degpos.eq.dec;meta.main