J/AJ/139/2014ivo://CDS.VizieR/J/AJ/139/2014doi:10.26093/cds/vizier.51392014CDSKinman T.D.Brown W.R.2017-07-04T07:09:28Z2012-06-17T21:13:02ZCDS support team

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

cds-question@unistra.frvariable-starsccd-photometryvisible-astronomyWide-band photometryIt is not easy to identify and classify low-amplitude variables, but it is important that the classification is done correctly. We use photometry and spectroscopy to classify low-amplitude variables in a 246deg^2^ part of the Akerlof et al. (2000, Cat. J/AJ/119/1901) field. Akerlof and Collaborators found that 38% of the RR Lyrae stars in their 2000deg^2^ test field were RR1 (type c). This suggests that these RR Lyrae stars belong to an Oosterhoff Type II population, while their period distribution is primarily Oosterhoff Type I. Our observations support their RR0 (type ab) classifications; however, six of the seven stars that they classified as RR1 (type c) are eclipsing binaries. Our classifications are supported by spectroscopic metallicities, line-broadening, and Galactic rotation measurements. Our 246deg^2^ field contains 16 RR Lyrae stars that are brighter than m_R_=14.5; only four of these are RR1 (type c). This corresponds to an Oosterhoff Type I population in agreement with the period distribution.2010AJ....139.2014Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/139/2014CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/139/2014https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/139/2014http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/139/2014https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/139/2014https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/139/2014http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/139/2014GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/139/2014/table1 (ROTSE1 RR Lyrae variables that are identified in the GCVS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/139/2014/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/139/2014/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/139/2014/table1?GETtext/xml+votable180.050000true187.28112534.64722220.005555555555555556Cone search capability for table J/AJ/139/2014/newVar (ROTSE1 RR Lyrae variables not identified in the GCVS, with spectroscopic results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/139/2014/newVar?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/139/2014/newVar?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/139/2014/newVar?GETtext/xml+votable180.050000true188.209708329.35655560.0055555555555555566/10292 10303 10344 10395 10406 10411 10415 10424 10444 10458 10473 10480 10486 10759 10778 10781 10792 10797 10802 10810 10816 10825 28030 28114 28116 28135 28143 28155 28156 28499 285023.322582951404819e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/139/2014?format=asciiOpticaldefaultJ/AJ/139/2014/table1ROTSE1 RR Lyrae variables that are identified in the GCVSROTSE1ROTSE1 designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeRR Lyrae type (G1)meta.code;src.varcharPerPerioddtime.perioddoubleWmagUnfiltered CCD mean magnitude of variablemagphot.mag;em.optfloatAmpUnfiltered CCD amplitude of variablemagsrc.var.amplitude;instr.detfloatNameIdentification in GCVSmeta.idcharType2Variable type given in GCVSmeta.note;src.morph.typecharPer2Period given in GCVSdtime.perioddoubleSimbadSimbad column added by the CDSmeta.refchar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/139/2014/newVarROTSE1 RR Lyrae variables not identified in the GCVS, with spectroscopic resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLClight curvesmeta.ref.urlcharROTSE1ROTSE1 designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryRRtRR Lyrae type (G1)meta.code;src.varcharPerPerioddtime.perioddoublee_Perrms uncertainty on Perdstat.errordoubleJDmaxJulian Date of maximum light (+2400000)dtime.epochdoubleDAccumulated phase error after 3 yearsstat.errorfloatWmagUnfiltered CCD mean magnitude of variablemagphot.mag;em.optfloatAmpUnfiltered CCD amplitude of variablemagsrc.var.amplitude;instr.detfloatQualQuality on scale 10 (excellent) downwardmeta.code.qual;instr.scaleintNote? Individual Notes and other designations (2)meta.noteintnullablePhot[T] T for Tenagra photometry (table 4)meta.codecharSimbadSimbad column added by the CDSmeta.refcharTypeRR Lyrae type or Eclipsing system (1)meta.code;src.varcharHJD? Heliocentric Julian Date of mid-exposure (+2,454,000.0)dtime.epochdoublenullableInt? Integration timestime.epochintnullablePhase? Phase of mid-exposuretime.phasefloatnullableHRV? Heliocentric radial velocity (2)km/sspect.dopplerVeloc;pos.heliocentricintnullableEWH? Mean pseudo-equivalent width of H{gamma} & H{delta}0.1nmspect.line.width;em.line.Hdelta;stat.meanfloatnullableEWK? Pseudo equivalent width of CaII K-line0.1nmspect.line.eqWidthfloatnullableDS? Non-standard {Delta}S indexspect.indexfloatnullableFWHM? FWHM of MgII {lambda}4481 line0.1nmspect.line.width;spect.linefloatnullablephi31? Fourier coefficient derived from hand-drawn light curveradstat.Fourierfloatnullable[m/H]1? Non-standard metallicity [m/H] derived from the spectraphys.abundfloatnullableu_[m/H]1Uncertainty flag on [m/H]1phys.abundchar[m/H]2? Non-standard [m/H] derived from the Fourier coefficient phi31phys.abundfloatnullableu_[m/H]2Uncertainty flag on [m/H]2phys.abundchar[m/H]3? Non-standard [m/H] derived from the V amplitude.phys.abundfloatnullable[m/H]4? Non-standard [m/H] derived from the Rise-time (phase difference between minimum and following maximum)phys.abundfloatnullable[m/H]? Adopted non-standard metallicity [m/H]phys.abundfloatnullableu_[m/H]Uncertainty flag on [m/H]phys.abundcharVMAGAbsolute magnitude derived as described in the textmagphys.magAbsfloatDistDistancekpcpos.distance;pos.heliocentricfloatVGalactic velocity vectorkm/sphys.veloc;pos.galacticinte_Vrms uncertainty on Galactic velocity vectorkm/sstat.error;pos.cartesian.yintu_V[)] Uncertainty flag on Vmeta.code.error;pos.cartesian.ychar_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.mainJ/AJ/139/2014/table3Photoelectric photometry of ROTSE1 variables in Table 2HJDHeliocentric Julian Datedtime.epochdoublePhasePhasetime.phasefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintROTSE1Star identification in Akerlof et al. (2000, Cat. J/AJ/119/1901)meta.id;meta.maincharVmagThe Johnson V magnitudemagphot.mag;em.opt.VfloatB-VThe Johnson (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatJ/AJ/139/2014/table4Tenagra CCD photometry of 6 ROTSE1 variables in Table 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintROTSE1Star identification in Akerlof et al. (2000, Cat. J/AJ/119/1901)meta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleVmag? The Johnson V band magnitudemagphot.mag;em.opt.VfloatnullableBmag? The Johnson B band magnitudemagphot.mag;em.opt.BfloatnullablePhasePhasetime.phasefloat