J/ApJ/829/26ivo://CDS.VizieR/J/ApJ/829/26doi:10.26093/cds/vizier.18290026CDSCusano F.Garofalo A.Clementini G.Cignoni M.Federici L.Marconi M.,Ripepi V.Musella I.Testa V.Carini R.Faccini M.2019-05-15T06:38:44Z2017-01-17T07:51:06ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomybroad-band-photometryvariable-starsWe present B and V time series photometry of Andromeda XXV, the third galaxy in our program on the Andromeda's satellites, which we have imaged with the Large Binocular Cameras of the Large Binocular Telescope. The field of Andromeda XXV is found to contain 62 variable stars, for which we present light curves and characteristics of the light variation (period, amplitudes, variability type, mean magnitudes, etc.). The sample includes 57 RR Lyrae variables (46 fundamental-mode-RRab, and 11 first-overtone-RRc, pulsators), 3 anomalous Cepheids, 1 eclipsing binary system, and 1 unclassified variable. The average period of the RRab stars (<Pab>=0.60 {sigma}=0.04d) and the period-amplitude diagram place Andromeda XXV in the class of the Oosterhoff-Intermediate objects. From the average luminosity of the RR Lyrae stars we derive for the galaxy a distance modulus of (m-M)_0_=24.63+/-0.17mag. The color-magnitude diagram reveals the presence in Andromeda XXV of a single, metal-poor ([Fe/H]=-1.8dex) stellar population as old as ~10-12Gyr, traced by a conspicuous red giant branch and the large population of RR Lyrae stars. We discovered a spherically shaped high density of stars near the galaxy center. This structure appears to be at a distance consistent with Andromeda XXV and we suggest it could either be a star cluster or the nucleus of Andromeda XXV. We provide a summary and compare the number and characteristics of the pulsating stars in the M31 satellites analyzed so far for variability.2016ApJ...829...26Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/829/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/143 : Revised Bologna Catalog of M31 clusters, V.5 (Galleti+ 2012)J/MNRAS/437/2307 : LMC anomalous Cepheid Ks light curves (Ripepi+, 2014)J/ApJ/779/7 : dSph satellites of M31. I. Variables in And XIX (Cusano+, 2013)J/MNRAS/435/1928 : Dwarf galaxy planes in Local Group (Pawlowski+, 2013)J/ApJ/776/80 : PAndAS view of Andromeda satellites. I. (Martin+, 2013)J/ApJ/768/172 : Kinematic analysis of red giant in M31 dSphs (Collins+, 2013)J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012)J/AJ/138/184 : RR Lyrae stars in 2 fields in M31 spheroid (Sarajedini+, 2009)J/AJ/129/2232 : Variable stars in And I and And III (Pritzl+, 2005)J/A+A/421/937 : Metal abundances of LMC RR Lyrae (Gratton+, 2004)J/AJ/127/2738 : ACS VI photometry of M31 halo RR Lyrea (Brown+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/829/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/829/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/829/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/829/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/829/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/829/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/829/26/table2 (Identification and properties of the variable stars detected in And XXV)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/829/26/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/829/26/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/829/26/table2?GETtext/xml+votable180.050000true7.5445333346.856030560.0055555555555555566/2766 27673.322582951404819e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/829/26?format=asciiOpticaldefaultJ/ApJ/829/26/table2Identification and properties of the variable stars detected in And XXVrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable star identifier (V1 to V63)meta.id;meta.maincharf_NameStar flag (1)meta.codecharRAJ2000[0] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[46] Degree of declination (J2000)pos.eq.dec;meta.mainTypeVariable Type, ? = uncertain typesrc.classcharPer[0.2/1.4] Perioddtime.perioddoubleEpochEpoch (max); HJD-2455000dtime.epochfloat<Bmag>[21.4/26] LBT/LBC intensity-weighted mean B band magnitudemagphot.mag;em.opt.Bfloat<Vmag>[19.9/25.6] LBT/LBC intensity-weighted mean V band magnitudemagphot.mag;em.opt.VfloatAmp-B[0.2/2] Amplitude of the B band light variationmagsrc.var.amplitude;em.opt.BfloatAmp-V[0.1/1.4] Amplitude of the V band light variationmagsrc.var.amplitude;em.opt.VfloatNpNumber of photometric measurements for this starmeta.numberintnullableLCInteractive LC plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/829/26/fig1Photometric data behind Figure 1 light curvesHJD[55852.6/55859] Observation date, HJD-2400000dtime.epochdoublemag[19.8/26.7] Photometric magnitude in filtermagphot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable star identifier as in table 2meta.id;meta.maincharFilt[B,V] Filter usedinstr.setup;instr.filterchar