J/AJ/150/129ivo://CDS.VizieR/J/AJ/150/129doi:10.26093/cds/vizier.51500129CDSSiegel M.H.Porterfield B.L.Balzer B.G.Hagen L.M.Z.2022-11-28T13:28:07Z2015-11-05T08:12:21ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsultraviolet-photometryWe present the first results of a Near-UltraViolet (NUV) survey of RR Lyrae stars from the Ultraviolet Optical Telescope (UVOT) on board the Swift Gamma-ray Burst Mission. It is well-established that RR Lyrae stars have large amplitudes in the far- and near-ultraviolet. We have used UVOT's unique wide-field NUV imaging capability to perform the first systematic NUV survey of variable stars in the Galactic globular clusters M3 and M15. We identify 280 variable stars, comprised of 275 RR Lyrae, 2 anomalous Cepheids, 1 classical Cepheid, 1 SX Phoenicis star, and 1 possible long-period or irregular variable. Only two of these are new discoveries. We compare our results to previous investigations and find excellent agreement in the periods with significantly larger amplitudes in the NUV. We map out, for the first time, an NUV Bailey diagram from globular clusters, showing the usual loci for fundamental mode RRab and first overtone RRc pulsators. We show the unique sensitivity of NUV photometry to both the temperatures and the surface gravities of RR Lyrae stars. Finally, we show evidence of an NUV period-metallicity-luminosity relationship. Future investigations will further examine the dependence of NUV pulsation parameters on metallicity and Oosterhoff classification.2015AJ....150..129Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/135/1459 : Period of M15 variable stars (Corwin+, 2008)J/ApJ/670/379 : UV photometry of M15 (Dieball+, 2007)J/MNRAS/372/1657 : BVI(c) light curves of variables in M3 (Benko+, 2006)J/AJ/129/1596 : BVI photometric variability survey of M3 (Hartman+, 2005)J/AJ/129/267 : RR Lyrae variables in NGC 5272 (Cacciari+, 2005)J/AcA/50/221 : Astrometry of variable stars in M3 (Bakos+, 2000)J/AJ/110/704 : RR Lyrae Variables in M15 (Silbermann+ 1995)J/AJ/108/1786 : Blue stragglers and variables in M3 (Guhathakurta+, 1994)J/AJ/106/154 : HST Observations in inner region of M15 (Ferraro+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/129https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/129/stars (Parameters of variable stars in M3 (table2) and M15 (table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/129/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/129/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/129/stars?GETtext/xml+votable180.050000true205.546291728.34263890.0055555555555555566/10336-10337 124057.863825992111117e-19 9.824864290000335e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/129?format=asciiUVdefaultJ/AJ/150/129/starsParameters of variable stars in M3 (table2) and M15 (table3)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterName of the globular cluster (M3 or M15)meta.id.parentcharNphotmeta.numberintnullableNameStellar identifier (G1)meta.id;meta.maincharf_Name[*] Star has a SHARP value greater than 0.5 (G2)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainPer[0.07163/253]? Perioddtime.perioddoublenullable<UVM2>[0/21] Mean Swift/UVOT UVM2 band magnitudemagphot.mag;em.UVfloatAmp[0.2/2.8]? Amplitude of the Swift/UVOT UVM2 band magnitudemagphot.magfloatnullableVar[0.22/25.96] Variability index from DAOPHOTsrc.var.indexfloatSHARP[-0.4/2.1] The SHARP parameter from DAOPHOTstat.fit.paramfloatLCLight Curvemeta.ref.urlcharJ/AJ/150/129/photometryPhotometry of variable stars in M3 (table4) and M15 (table5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterName of the globular cluster (M3 or M15)meta.id.parentcharNameStellar identifier (G1)meta.id;meta.maincharf_Name[*] Star has a SHARP value greater than 0.5 (G2)meta.codecharJDJulian Date of observationdtime.epochdoubleindexedUVM2[13.9/22] Swift/UVOT UVM2 band magnitudemagphot.mag;em.UVfloate_UVM2[0.016/0.398] Uncertainty in UVM2magstat.errorfloat