J/ApJ/743/19ivo://CDS.VizieR/J/ApJ/743/19doi:10.26093/cds/vizier.17430019CDSClementini G.Contreras Ramos R.Federici L.Macario G.Beccari G.,Testa V.Cignoni M.Marconi M.Ripepi V.Tosi M.Bellazzini M.,Fusi Pecci F.Diolaiti E.Cacciari C.Marano B.Giallongo E.,Ragazzoni R.Di Paola A.Gallozzi S.Smareglia R.2018-01-30T07:18:08Z2013-05-28T16:45:52ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomybroad-band-photometrygalaxiesPhotometry in B, V (down to V~26mag) is presented for two 23'x23' fields of the Andromeda galaxy (M31) that were observed with the blue channel camera of the Large Binocular Telescope during the Science Demonstration Time. Each field covers an area of about 5.1x5.1kpc^2^ at the distance of M31 ({mu}_M31_~24.4mag), sampling, respectively, a northeast region close to the M31 giant stream (field S2) and an eastern portion of the halo in the direction of the galaxy minor axis (field H1). The stream field spans a region that includes Andromeda's disk and giant stream, and this is reflected in the complexity of the color-magnitude diagram of the field. One corner of the halo field also includes a portion of the giant stream. Even though these demonstration time data were obtained under non-optimal observing conditions, the B photometry, which was acquired in time-series mode, allowed us to identify 274 variable stars (among which 96 are bona fide and 31 are candidate RR Lyrae stars, 71 are Cepheids, and 16 are binary systems) by applying the image subtraction technique to the selected portions of the observed fields. Differential flux light curves were obtained for the vast majority of these variables. Our sample mainly includes pulsating stars that populate the instability strip from the Classical Cepheids down to the RR Lyrae stars, thus tracing the different stellar generations in these regions of M31 down to the horizontal branch of the oldest (t~10Gyr) component.2011ApJ...743...19Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/743/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/141/171 : RR Lyrae stars in six ultra-deep fields of M31 (Jeffery+, 2011)J/ApJ/708/817 : RR Lyrae variables in M32 and M31 (Fiorentino+, 2010)J/AJ/138/184 : RR Lyrae variables in 2 fields in M31 (Sarajedini+, 2009)J/MNRAS/390/1437 : Stellar streams in Andromeda (M31) (Chapman+, 2008)J/AJ/127/2738 : ACS VI photometry of M31 halo RR Lyrea (Brown+, 2004)J/A+A/402/113 : (RI)c photometry of variables in M31 (Joshi+, 2003)J/AJ/124/234 : M31 halo UBVRI photometry and metallicity (Reitzel+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/743/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/743/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/743/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/743/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/743/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/743/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/743/19/table9 (Identification and characteristics of candidate variable stars identified in the M31 fields S2 and H1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/19/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/19/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/19/table9?GETtext/xml+votable180.050000true12.187542.3513890.005555555555555556Cone search capability for table J/ApJ/743/19/table10 (Properties of confirmed variable stars in the M31 field S2 with light curves on a magnitude scale)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/19/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/19/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/19/table10?GETtext/xml+votable180.050000true12.15166742.2491670.0055555555555555566/2621 2666 2667https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/743/19?format=asciiOpticaldefaultJ/ApJ/743/19/table9Identification and characteristics of candidate variable stars identified in the M31 fields S2 and H1Per? Perioddtime.periodfloatnullableNoteAdditional note(s) (4)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCCD[1/2] CCD numbermeta.id;instrintFldField location (H1 or S2)meta.notecharISIS[728/12408]? ISIS identification number (G1)meta.idintnullableDoP[80/54011]? DoPHOT identification number (1)meta.idintnullableRAJ2000[0] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[40/42] Degree of Declination (J2000)pos.eq.dec;meta.mainu_Per[?] Uncertainty flag on Permeta.code.errorcharBmag[19.62/26.52]? The B band magnitude (2)magphot.mag;em.opt.BfloatnullableBrand? B band random phase magnitudemagphot.mag;em.opt.BfloatnullableVmag? The V band magnitude (2)magphot.mag;em.opt.VfloatnullableVrand? V band random phase magnitudemagphot.mag;em.opt.VfloatnullableTypeVariable type (3)src.classcharVIDConfirmed variable (id from table 10)meta.idcharprimaryJ/ApJ/743/19/table10Properties of confirmed variable stars in the M31 field S2 with light curves on a magnitude scalerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVIDVariable namemeta.id;meta.maincharprimaryISIS[4562/9171]? ISIS identification number (G1)meta.idintnullableRAJ2000[0] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[42] Degree of declination (J2000)pos.eq.dec;meta.mainTypeVariable type (RRab, Cepheid or Binary)src.classcharPer[0.574/9.4] Perioddtime.periodfloatu_PerUncertainty flag on Permeta.code.errorcharEpochEpoch (JD-2450000) (1)dtime.epochdoubleu_EpochUncertainty flag on Epochmeta.code.error;time.epochcharNVNumber of V measurementsmeta.numberintNBNumber of B measurementsmeta.numberint<Bmag>Intensity-averaged mean B magnitudemagphot.mag;em.opt.Bfloatu_<Bmag>Uncertainty flag on <Bmag>meta.code.errorcharABB-band extinctionmagphys.absorption;em.opt.Bfloatu_ABUncertainty flag on ABmeta.code.errorchar<Vmag>Intensity-averaged mean V magnitude (2)magphot.mag;em.opt.Vfloatu_<Vmag>Uncertainty flag on <Vmag>meta.code.error;pos.cartesian.ychar