J/AJ/110/1141ivo://CDS.VizieR/J/AJ/110/1141doi:10.26093/cds/vizier.51101141CDSMateo M.Kubiak M.Szymanski M.Kaluzny J.Krzeminski W.Udalski A.2023-04-06T16:50:17Z1997-12-09T20:28:00ZCDS support team

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

cds-question@unistra.frgravitational-lensingccd-photometryvariable-starsWe present time-series CCD photometry of a field in the newly discovered dwarf spheroidal galaxy in Sagittarius (hereafter Sgr), and of a nearby control field. These data, which consist of VI images obtained during the 1994 OGLE season, were used to identify and study variable stars in both fields. We discovered ten variable stars in the Sgr field, nine of which have light curves and periods consistent with RR Lyr stars or anomalous Cepheids. The control field contains four short-period contact eclipsing binaries, but no pulsating variables. The variables in the Sgr field include a bright RR Lyr star that is almost certainly located in front of Sgr in the galactic bulge, a short-period contact binary located near or within Sgr, and a short-period pulsating star that may either be a foreground halo RR Lyr star or an anomalous Cepheid within Sgr. The seven remaining variables in the Sgr field are RR Lyr stars with very similar mean apparent magnitudes; we conclude that they are members of Sgr. We estimate the total number of RR Lyr stars in Sgr to be 1930+/-730 if M(V,Sgr)=-13, or 310+/-120 if M(V,Sgr)=-11. The frequency of pulsating variables in Sgr is consistent with earlier conclusions that the galaxy consists of a predominant old (age>~10Gyr) population.1995AJ....110.1141Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/110/1141CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/110/1141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/110/1141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/110/1141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/110/1141https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/110/1141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/110/1141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/110/1141/table5aV-band data for the Sgr-field variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleVmagV1[]? Sgr V1 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV1[]? VmagV1 errormagstat.errorfloatPhasV1[0/1[? Sgr V1 phasetime.phasefloatVmagV2[]? Sgr V2 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV2[]? VmagV2 errormagstat.errorfloatPhasV2[0/1[? Sgr V2 phasetime.phasefloatVmagV3[]? Sgr V3 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV3[]? VmagV3 errormagstat.errorfloatPhasV3[0/1[? Sgr V3 phasetime.phasefloatVmagV4[]? Sgr V4 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV4[]? VmagV4 errormagstat.errorfloatPhasV4[0/1[? Sgr V4 phasetime.phasefloatVmagV5[]? Sgr V5 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV5[]? VmagV5 errormagstat.errorfloatPhasV5[0/1[? Sgr V5 phasetime.phasefloatVmagV6[]? Sgr V6 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV6[]? VmagV6 errormagstat.errorfloatPhasV6[0/1[? Sgr V6 phasetime.phasefloatVmagV7[]? Sgr V7 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV7[]? VmagV7 errormagstat.errorfloatPhasV7[0/1[? Sgr V7 phasetime.phasefloatVmagV8[]? Sgr V8 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV8[]? VmagV8 errormagstat.errorfloatPhasV8[0/1[? Sgr V8 phasetime.phasefloatVmagV9[]? Sgr V9 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV9[]? VmagV9 errormagstat.errorfloatPhasV9[0/1[? Sgr V9 phasetime.phasefloatVmagV10[]? Sgr V10 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV10[]? VmagV10 errormagstat.errorfloatPhasV10[0/1[? Sgr V10 phasetime.phasefloatJ/AJ/110/1141/table5bV-band data for the Control-field variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleVmagV1c[]? Control V1 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV1c[]? VmagV1c errormagstat.errorfloatPhasV1c[0/1[? Control V1 phasetime.phasefloatVmagV2c[]? Control V2 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV2c[]? VmagV2c errormagstat.errorfloatPhasV2c[0/1[? Control V2 phasetime.phasefloatVmagV3c[]? Control V3 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV3c[]? VmagV3c errormagstat.errorfloatPhasV3c[0/1[? Control V3 phasetime.phasefloatVmagV4c[]? Control V4 calibrated V magnitudemagphot.mag;em.opt.Vfloate_VmagV4c[]? VmagV4c errormagstat.errorfloatPhasV4c[0/1[? Control V4 phasetime.phasefloatJ/AJ/110/1141/table5cI-band data for the Sgr-field variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleImagV1[]? Sgr V1 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV1[]? ImagV1 errormagstat.errorfloatPhasV1[0/1[? Sgr V1 phasetime.phasefloatImagV2[]? Sgr V2 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV2[]? ImagV2 errormagstat.errorfloatPhasV2[0/1[? Sgr V2 phasetime.phasefloatImagV3[]? Sgr V3 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV3[]? ImagV3 errormagstat.errorfloatPhasV3[0/1[? Sgr V3 phasetime.phasefloatImagV4[]? Sgr V4 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV4[]? ImagV4 errormagstat.errorfloatPhasV4[0/1[? Sgr V4 phasetime.phasefloatImagV5[]? Sgr V5 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV5[]? ImagV5 errormagstat.errorfloatPhasV5[0/1[? Sgr V5 phasetime.phasefloatImagV6[]? Sgr V6 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV6[]? ImagV6 errormagstat.errorfloatPhasV6[0/1[? Sgr V6 phasetime.phasefloatImagV7[]? Sgr V7 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV7[]? ImagV7 errormagstat.errorfloatPhasV7[0/1[? Sgr V7 phasetime.phasefloatImagV8[]? Sgr V8 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV8[]? ImagV8 errormagstat.errorfloatPhasV8[0/1[? Sgr V8 phasetime.phasefloatImagV9[]? Sgr V9 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV9[]? ImagV9 errormagstat.errorfloatPhasV9[0/1[? Sgr V9 phasetime.phasefloatImagV10[]? Sgr V10 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV10[]? ImagV10 errormagstat.errorfloatPhasV10[0/1[? Sgr V10 phasetime.phasefloatJ/AJ/110/1141/table5dI-band data for the Control-field variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleImagV1c[]? Control V1 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV1c[]? ImagV1c errormagstat.errorfloatPhasV1c[0/1[? Control V1 phasetime.phasefloatImagV2c[]? Control V2 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV2c[]? ImagV2c errormagstat.errorfloatPhasV2c[0/1[? Control V2 phasetime.phasefloatImagV3c[]? Control V3 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV3c[]? ImagV3c errormagstat.errorfloatPhasV3c[0/1[? Control V3 phasetime.phasefloatImagV4c[]? Control V4 calibrated I magnitudemagphot.mag;em.opt.Ifloate_ImagV4c[]? ImagV4c errormagstat.errorfloatPhasV4c[0/1[? Control V4 phasetime.phasefloat