J/MNRAS/372/69ivo://CDS.VizieR/J/MNRAS/372/69doi:10.26093/cds/vizier.73720069CDSLazaro C.Arellano Ferro A.Arevalo A.Bramich D.M.Giridhar S.,Poretti E.2024-07-03T20:14:35Z2013-02-22T14:02:53ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsccd-photometryWe report the results of CCD V and R photometry of the RR Lyrae stars in M2. The periodicities of most variables are revised and new ephemerides are calculated. Light-curve decomposition of the RR Lyrae stars was carried out and the corresponding mean physical parameters [Fe/H]=-1.47, Teff=6276K, logL=1.63L_{sun}_ and M_V_=0.71 from nine RRab and [Fe/H]=-1.61, M=0.54M_{sun}_, Teff=7215K, logL=1.74L_{sun}_ and M_V_=0.71 from two RRc stars were calculated. A comparison of the radii obtained from the above luminosity and temperature with predicted radii from non-linear convective models is discussed. The estimated mean distance to the cluster is 10.49+/-0.15kpc. These results place M2 correctly in the general globular cluster sequences for Oosterhoff type, mass, luminosity and temperature, all as a function of the metallicity. Mean relationships for M, logL/L_{sun}_, Teff and MV as a function of [Fe/H] for a family of globular clusters are offered. These trends are consistent with evolutionary and structural notions on the horizontal branch. Eight new variables are reported.2006MNRAS.372...69Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/372/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/2868 : BV photometry in M2 (NGC 7089) (Lee+, 1999)V/97 : Updated 3rd Cat Variable Stars in Globular Clusters (Clement+ 1997)http://www.astro.utoronto.ca/~cclement/read.html : Christine Clement'shttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/372/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/372/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/372/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/372/69https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/372/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/372/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/372/69/stars (Summary of observed stars (from table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/372/69/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/372/69/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/372/69/stars?GETtext/xml+votable180.050000true323.3685833-0.79872220.0055555555555555566/19091https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/372/69?format=asciiOpticaldefaultJ/MNRAS/372/69/starsSummary of observed stars (from table3)LCmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star numbermeta.id;meta.maincharprimaryRRtRR Lyr variability type (ab or c) (1)meta.code;src.varcharNobsNumber of observations for this starmeta.numberintnullableRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainPerPeriod (1)dtime.perioddoubleT0? Epoch (JD-2400000) (1)dtime.epochdoublenullableSimbadSimbad column added by the CDSmeta.refcharJ/MNRAS/372/69/varphotCCD time-series V and R photometry of 30 variables in M2 (NGC7089)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star ID (V35 to V42)meta.id;meta.maincharFilter[VR] Observation filterobs.param;obscharHJDHeliocentric Julian date at mid-exposuredtime.epochdoublemagst? Standard magnitudemagphot.magfloatnullablemaginstInstrumental magnitudemagphot.magfloate_maginstMagnitude uncertainty (standard or instrumental)magstat.errorfloat