J/MNRAS/427/2647ivo://CDS.VizieR/J/MNRAS/427/2647doi:10.26093/cds/vizier.74272647CDSMcDonald I.White J.R.Zijlstra A.A.Guzman Ramirez L.Szyszka C.,van Loon J.T.Lagadec E.Jones O.C.2024-07-19T20:17:08Z2013-08-22T15:01:51ZCDS support team

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

cds-question@unistra.frgalaxieslate-type-starscarbon-starsradial-velocityspectroscopymorgan-keenan-classificationinfrared-photometryWe present spectra of 1142 colour-selected stars in the direction of the Sagittarius Dwarf Spheroidal (Sgr dSph) galaxy, of which 1058 were taken with VLT/FLAMES multi-object spectrograph and 84 were taken with the SAAO Radcliffe 1.9-m telescope grating spectrograph. Spectroscopic membership is confirmed (at >99 per cent confidence) for 592 stars on the basis of their radial velocity, and spectral types are given. Very slow rotation is marginally detected around the galaxy's major axis. We identify five S stars and 23 carbon stars, of which all but four carbon stars are newly determined and all but one (PQ Sgr) are likely Sgr dSph members. We examine the onset of carbon richness in this metal-poor galaxy in the context of stellar models. We compare the stellar death rate (one star per 1000-1700yr) with the known planetary nebula dynamical ages and find that the bulk population produce the observed (carbon-rich) planetary nebulae. We compute average lifetimes of S and carbon stars as 60-250 and 130-500kyr, compared to a total thermal-pulsing asymptotic giant branch lifetime of 530-1330kyr. We conclude by discussing the return of carbon-rich material to the interstellar medium.2012MNRAS.427.2647Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/427/2647CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/414/503 : Abundances in the Sgr dSph (Bonifacio+, 2004)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)J/A+A/513/A62 : Sgr dSph VIMOS photometry & radial velocity (Giuffrida+, 2010)J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)J/ApJ/708/1290 : A 2MASS view of the Sgr dSph. VI. (Chou+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/427/2647https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/427/2647http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/427/2647https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/427/2647https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/427/2647http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/427/2647GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/427/2647/table2 (Spectral types and radial velocities of targets observed with the VLT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/427/2647/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/427/2647/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/427/2647/table2?GETtext/xml+votable180.050000true283.8018333-30.39416670.005555555555555556Cone search capability for table J/MNRAS/427/2647/table3 (Spectral types of targets observed with the SAAO Radcliffe 1.9-m)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/427/2647/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/427/2647/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/427/2647/table3?GETtext/xml+votable180.050000true284.0468333-29.065250.0055555555555555565/12008 12010 6/47863 47869 48036 48038 480448.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/427/2647?format=asciiOpticalInfrareddefaultJ/MNRAS/427/2647/table2Spectral types and radial velocities of targets observed with the VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential number (1)meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (G1)src.spTypecharKsmag2MASS Ks magnitudemagphot.mag;em.IR.KfloatJ-Ks2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatsigmaVelocity dispersionkm/sphys.veloc.dispersionfloatPmembProbability of membership of the Sgr dSph%statfloatTiOTiO band strength indexspect.indexfloatZrOZrO band strength indexspect.indexfloatSimbadNameSimbad column added by the CDSmeta.idcharJ/MNRAS/427/2647/table3Spectral types of targets observed with the SAAO Radcliffe 1.9-mrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainKsmag2MASS Ks magnitudemagphot.mag;em.IR.KfloatJ-Ks2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatSpType[CMU] Spectral type (G1)src.spTypecharSimbadNameSimbad column added by the CDSmeta.idchar