J/AJ/127/2738ivo://CDS.VizieR/J/AJ/127/2738doi:10.26093/cds/vizier.51272738CDSBrown T.M.Ferguson H.C.Smith E.Kimble R.A.Sweigart A.V.,Renzini A.Rich R.M.2023-12-20T08:24:12Z2006-04-09T08:19:19ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe present a complete census of RR Lyrae stars in a halo field of the Andromeda galaxy. These deep observations, taken as part of a program to measure the star formation history in the halo, spanned a period of 41 days with sampling on a variety of timescales, enabling the identification of short- and long-period variables. Although the long-period variables cannot be fully characterized within the time span of this program, the enormous advance in sensitivity provided by the Advanced Camera for Surveys on the Hubble Space Telescope allows accurate characterization of the RR Lyrae population in this field. We find 29 RRab stars with a mean period of 0.594 days, 25 RRc stars with a mean period of 0.316 days, and one RRd star with a fundamental period of 0.473 days and a first-overtone period of 0.353 days. These 55 RR Lyrae stars imply a specific frequency S_RR_~5.6, which is large given the high mean metallicity of the halo, but not surprising given that these stars arise from the old, metal-poor tail of the distribution.2004AJ....127.2738Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/127/2738CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/402/113 : (RI)c photometry of variables in M31 (Joshi+, 2003)J/AJ/124/234 : M31 outer halo UBVRI phot. and metallicity (Reitzel+, 2002)J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/127/2738https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/127/2738http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/127/2738https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/127/2738https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/127/2738http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/127/2738GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/127/2738/table1 (RR Lyrae properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/2738/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/2738/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/2738/table1?GETtext/xml+votable180.050000true11.49940.68838890.005555555555555556Cone search capability for table J/AJ/127/2738/table3 (Positions of other variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/2738/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/2738/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/2738/table3?GETtext/xml+votable180.050000true11.491291740.71336110.0055555555555555566/26232.0401237512456292e-19 3.9057996558789745e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/127/2738?format=asciidefaultJ/AJ/127/2738/table1RR Lyrae propertiesPer? Period (only in table1.dat)dtime.periodfloatnullable<F606W>? F606W (V) mean magnitude (only in table1.dat)magphot.mag;em.opt.Rfloatnullable<F814W>? F814W (I) mean magnitude (only in table1.dat)magphot.mag;em.opt.IfloatnullableAF606W? Absorption in F606W band (only in table1.dat)magphys.absorptionfloatnullableAF814W? Absorption in F814W band (only in table1.dat)magphys.absorptionfloatnullableType? [abcd ] RR Lyrae class (only in table1.dat)meta.code;src.varcharPlotplot the observations of this star as a function of timemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BFS2004]Variable number, VNNNmeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainJ/AJ/127/2738/table2RR Lyrae photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BFS2004]Variable number, VNNNmeta.id;meta.maincharMJDModified Julian Date (JD-2400000.5)dtime.epochdoubleindexedBandFilter (F606W or F814W)instr.bandpasscharmag? Magnitude in Bandmagphot.magfloatnullableJ/AJ/127/2738/table3Positions of other variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BFS2004]Variable number, VNNNmeta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainPer? Period (only in table1.dat)dtime.periodfloatnullable