J/AJ/121/841ivo://CDS.VizieR/J/AJ/121/841doi:10.26093/cds/vizier.51210841CDSPiatek S.Pryor C.Armandroff T.E.Olszewski E.W.2023-04-06T16:50:43Z2009-04-19T14:14:17ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryccd-photometryWe report R- and V-band photometry derived from CCD imaging for objects in nine fields in and around the Draco dwarf spheroidal galaxy. The most distant fields are about 1.3{deg} from the center. We use these data to search for Draco stars outside of its measured tidal boundary. The search involves three methods: (1) plotting color-magnitude diagrams for individual fields, for sections of fields, and for combined fields and sections - a colour-magnitude diagram can reveal a population of Draco stars by the presence of the expected principal sequences; (2) measuring field-to-field fluctuations in the surface density of objects located near the Draco principal sequences in the color-magnitude diagram; (3) measuring intrafield fluctuations in the surface density of those objects. We find evidence for the presence of Draco stars immediately beyond the measured tidal boundary of Draco and place an upper limit on the number of such stars in more distant fields that lie close to the extension of its major axis. The best evidence is the presence of the Draco principal sequences in the color-magnitude diagram for some combined fields and sections of fields. The measurements of the field-to-field fluctuations in the stellar surface density confirm this result.2001AJ....121..841Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/841CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/2131 : M/L for Draco and UMi. I. (Armandroff+ 1995)J/MNRAS/330/792 : Radial velocity in Draco (Kleyna+, 2002)J/AJ/123/2511 : Draco dwarf spheroidal galaxy RV photometry (Piatek+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/841https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/841http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/841https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/841https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/841http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/841GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/841/table1 (Information about fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/841/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/841/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/841/table1?GETtext/xml+votable180.050000true260.029958357.92661110.005555555555555556Cone search capability for table J/AJ/121/841/table4 (R and V Photometry of Draco)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/841/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/841/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/841/table4?GETtext/xml+votable180.050000true260.05537557.97474170.0055555555555555565/2545 6/10094-10095 10185 10187-10189 10191-10192 10194https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/841?format=asciiOpticaldefaultJ/AJ/121/841/table1Information about fieldsDEJ2000Declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField designation (1)meta.id;meta.maincharDateObservation datetime.epoch;obsnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloato_TexpVNumber of expositions in V bandmeta.numberintTexpVTime of each expositions in V bandstime.duration;obs.exposureinto_TexpRNumber of expositions in R bandmeta.numberintTexpRTime of each expositions in R bandstime.duration;obs.exposureintFWHMV? FWHM in V bandpixphys.angSize;em.opt.Vfloatnullablee_FWHMV? rms uncertainty on FWHMVpixstat.errorfloatnullableFWHMR? FWHM in R bandpixphys.angSize;em.opt.Rfloatnullablee_FWHMR? rms uncertainty on FWHMRpixstat.errorfloatnullableJ/AJ/121/841/table4R and V Photometry of DracorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PPA2001]Star designation, WWN NNNNN (1)meta.id;meta.maincharindexedXpixX pixel coordinate on the R framepixpos.framedoubleYpixY pixel coordinate on the R framepixpos.framedoubleRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)pos.eq.dec;meta.mainindexedRmagR band magnitudemagphot.mag;em.opt.Rfloate_RmagUncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatVmagV band magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatChiAverage robust measure of {chi}^2^physfloatSharpAverage sharpness value of object (2)src.class.starGalaxydoubleLink1Display the Field characteristicsmeta.ref.urlchar