J/A+A/650/A146ivo://CDS.VizieR/J/A+A/650/A146doi:10.26093/cds/vizier.36500146CDSMauron N.Gigoyan K.S.Kendall T.R.Hambleton K.M.2022-07-06T06:35:58Z2021-06-23T08:44:53ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygiant-starsm-starslate-type-starsTo investigate the asymptotic giant branch (AGB) population in the Galactic halo, we search for pulsating AGB stars at a heliocentric distance over 50kpc. Our research is based on the Catalina Southern Survey (CSS) catalogue of variables, comprising 1286 long-period variables (LPVs) with declination less than -20{deg}. We first focus on the 77 stars in the cap abs(b)>30deg for which spectral M-type or C-type classification can be derived from Hamburg-ESO objective prism spectra. Most of these are oxygen-rich (M-type) and very few are carbon rich. The periods are in the range 100-500 days, and CSS amplitudes are up to 3mag. In this small sample, no halo AGB star is fainter than Ks0=12.5. This may be due to the scarcity of AGBs in the outer halo, or insufficient instrumental depth. Leaving aside spectral information, we then searched for even fainter pulsators (Ks>12.5) in the entire CSS catalogue. Gaia astrometry makes it possible to identify some contaminants. Our final result is the identification of ten candidate distant LPVs. If these ten stars obey the fundamental mode K-band period luminosity relation used for Miras and small-amplitude Miras, their distances are between 50 and 120kpc from the Sun. In a diagram showing distance versus Gaia tangential velocity, these ten stars have positions similar to those of other objects in the halo, such as globular clusters and dwarf galaxies. We also detect some underluminous AGBs that deserve further study. A detailed catalogue of the 77 high-latitude M or C stars will be made available at the CDS.2021A&A...650A.146Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/650/A146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/MNRAS/469/3688 : CSS Periodic Variable Star Catalogue (Drake+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/650/A146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/650/A146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/650/A146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/650/A146https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/650/A146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/650/A146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/650/A146/table5 (Parameters for 77 stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/650/A146/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/650/A146/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/650/A146/table5?GETtext/xml+votable180.050000true3.14270694-22.9213350.0055555555555555566/16607 16616 21120 24578 24647 24653 24662 24697 24814 24896 25089 25128 33063 33086 33135 33146-33147 33209 33221 33435 33618 33780 33862 33869 34131 34637 35182 35468 35720 35955 35969 35977 38778 43850 43875 43888 43944 44016 44565 44593 44598 44623 45427 45438 45543 45843 45991 46001 46165 46292 46311 46420 46492 46625 46637 46683 46781 46813 46832 46834 46890 46892 46898 46901 46920 47005 47024 47045 47084 47089 48216 48222 48248 48386 48696https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/650/A146?format=asciidefaultJ/A+A/650/A146/table5Parameters for 77 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar denominationmeta.id;meta.maincharRAJ2000Right Ascension J2000 (1)degpos.eq.ra;meta.mainDEJ2000Declination J2000 (1)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatLsgrLongitude(Sgr) (2)degpos.framefloatBsgrLatitude(Sgr) (2)degpos.framefloatE(B-V)Extinction from Schlegel (3)magphot.color.excessfloatKsmag0Dereddened Ks 2MASS photometrymagphot.mag;em.IR.Kfloat(J-Ks)0Dereddened J-Ks colormagphot.color;em.IR.J;em.IR.KfloatKsMAG0? Ks-band absolute magnitudemagphys.magAbsfloatnullableiflag[1/6] Information flag (4)meta.codeintDkpc? Distance (5)kpcpos.distancefloatnullablee_Dkpc? Uncertainty on Dkpckpcstat.errorfloatnullableZkpc? Height from the Galactic plane (6)kpcpos.cartesian.z;pos.galacticfloatnullablePPeriod in days (7)dtime.periodfloatDeltamAmplitude (CSS); peak-to-peakmagphot.magfloatmCSSTime-averaged CSS-band magnitude (8)magphot.mag;em.optfloatplxGAIA EDR3 parallaxmaspos.parallax.trigdoublepmRAGAIA EDR3 proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublee_pmRAGAIA EDR3 error on pmRAmas/yrstat.error;pos.pm;pos.eq.radoublepmDEGAIA EDR3 proper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmDEGAIA EDR3 error on pmDEmas/yrstat.error;pos.pm;pos.eq.decdoubleRV? Heliocentric radial velocity (9)km/sspect.dopplerVeloc;pos.heliocentricdoublenullablee_RV? Uncertainty on RV (10)km/sstat.errorfloatnullabler_RVIndicates the source of the RV (11)meta.ref;pos.framecharTypeSpectral type (M-type or C-type)src.spTypechar2MASSStandard 2MASS identificationmeta.idcharCSSnameCSS name of star, Drake et al. (2017MNRAS.469.3688D, Cat. J/MNRAS/469/3688)meta.idcharCommCandi/LMC/Sculp/Fornax/etc (12)meta.notecharpmTotal proper motionmas/yrpos.pmfloatVtang? Tangential velocity (13)km/sphys.veloc.transversefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar