J/MNRAS/439/2618ivo://CDS.VizieR/J/MNRAS/439/2618doi:10.26093/cds/vizier.74392618CDSMcDonald I.Zijlstra A.A.Sloan G.C.Kerins E.Lagadec E.Minniti D.2024-08-08T20:12:47Z2015-03-12T16:38:43ZCDS support team

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

cds-question@unistra.frgalaxiesvariable-starsphotometryVariability is examined in over 2.6 million stars covering 11 square degrees of the core of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) from Visible and Infrared Survey Telescope for Astronomy Z-band observations. Generally, pulsation on the Sgr dSph giant branches appears to be excited by the internal {kappa} mechanism. Pulsation amplitudes appear identical between red and asymptotic (red giant branch/asymptotic giant branch) giant stars, and between unreddened carbon and oxygen-rich stars at the same luminosity. The lack of correlation between infrared excess and variability among oxygen-rich stars indicates that pulsations do not contribute significantly to wind driving in oxygen-rich stars in the Sgr dSph, though the low amplitudes of these stars mean this may not apply elsewhere. The dust-enshrouded carbon stars have the highest amplitudes of the stars we observe. Only in these stars does an external {kappa}-mechanism-driven pulsation seem likely, caused by variations in their more opaque carbon-rich molecules or dust. This may allow pulsation driving of winds to be effective in carbon stars. Variability can be simplified to a power law (A{prop.to}L/T_2_), as in other systems. In total, we identify 3026 variable stars (with rms variability of {delta}Z>~0.015mag), of which 176 are long-period variables associable with the upper giant branches of the Sgr dSph. We also identify 324 candidate RR Lyrae variables in the Sgr dSph and 340 in the outer Galactic bulge.2014MNRAS.439.2618Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/439/2618CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/427/2647 : Sgr dSph stars spectral classification (McDonald+, 2012)J/MNRAS/436/413 : Sgr dSph ZJKs photometry (McDonald+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/439/2618https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/439/2618http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/439/2618https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/439/2618https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/439/2618http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/439/2618GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/439/2618/variables (Variables in our data: candidate short-period variables (table 1), bright Long-Period variables (table2), and candidate faint LPVs (table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/439/2618/variables?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/439/2618/variables?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/439/2618/variables?GETtext/xml+votable180.050000true281.58910167-29.451430560.0055555555555555565/12008 12010 6/28756-28757 28759 28928-28930 47861 47863 47869-47871 48010-48011 48014-48015 48036-48038 48044 480468.643406281242892e-20 2.393642124494231e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/439/2618?format=asciiOpticaldefaultJ/MNRAS/439/2618/variablesVariables in our data: candidate short-period variables (table 1), bright Long-Period variables (table2), and candidate faint LPVs (table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTabSimbad column added by the CDSmeta.id;meta.datasetcharNameStar designation (1)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainZmagVISTA Z magnitudemagphot.mag;em.opt.Ifloate_ZmagStandard deviation of Zmag (rms variability in the light-curve)magstat.error;phot.mag;em.opt.Ifloat<Zmag>Total observed rangemagarith.rate;src.var.amplitudefloatJmagVISTA J magnitudemagphot.mag;em.IR.JfloatKsmagVISTA Ks magnitudemagphot.mag;em.IR.Kfloat