J/ApJ/790/164ivo://CDS.VizieR/J/ApJ/790/164doi:10.26093/cds/vizier.17900164CDSCalamida A.Sahu K.C.Anderson J.Casertano S.Cassisi S.Salaris M.,Brown T.Sokol J.Bond H.E.Ferraro I.Ferguson H.Livio M.,Valenti J.Buonanno R.Clarkson W.Pietrinferni A.2017-05-22T14:51:27Z2017-03-29T14:28:05ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsmilky-way-galaxyhst-photometryproper-motionsWe present Hubble Space Telescope data of the low-reddening Sagittarius window in the Galactic bulge. The Sagittarius Window Eclipsing Extrasolar Planet Search field (~3'x3'), together with three more Advanced Camera for Surveys and eight Wide-Field Camera 3 fields, were observed in the F606W and F814W filters, approximately every two weeks for 2 yr, with the principal aim of detecting a hidden population of isolated black holes and neutron stars through astrometric microlensing. Proper motions were measured with an accuracy of ~0.1 mas/yr (~4 km/s) at F606W ~25.5 mag, and better than ~0.5 mas/yr (~20 km/s) at F606W ~28 mag, in both axes. Proper-motion measurements allowed us to separate disk and bulge stars and obtain a clean bulge color-magnitude diagram. We then identified for the first time a white dwarf (WD) cooling sequence in the Galactic bulge, together with a dozen candidate extreme horizontal branch stars. The comparison between theory and observations shows that a substantial fraction of the WDs (~30%) are systematically redder than the cooling tracks for CO-core H-rich and He-rich envelope WDs. This evidence would suggest the presence of a significant number of low-mass WDs and WD-main-sequence binaries in the bulge. This hypothesis is further supported by the finding of two dwarf novae in outburst, two short-period (P <~ 1 day) ellipsoidal variables, and a few candidate cataclysmic variables in the same field.2014ApJ...790..164Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/790/164CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/549/A147 : Abundances of microlensed bulge dwarf stars. V.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/790/164https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/790/164http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/790/164https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/790/164https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/790/164http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/790/164GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/790/164/table1 (List of the Candidate Bulge WDs in the SWEEPS Field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/790/164/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/790/164/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/790/164/table1?GETtext/xml+votable180.050000true269.7715417-29.19360830.0055555555555555566/288642.0401237512456292e-19 3.9057996558789745e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/790/164?format=asciidefaultJ/ApJ/790/164/table1List of the Candidate Bulge WDs in the SWEEPS FieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCandidate bulge WD identifier (1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainF814WmagF814W-band apparent magnitudemagphot.mag;em.opt.IfloatF606WmagF606W-band apparent magnitudemagphot.mag;em.opt.RfloatpmGLATProper motion along GLATmas/yrpos.pmfloatpmGLONProper motion along GLONmas/yrpos.pmfloat