J/MNRAS/502/818ivo://CDS.VizieR/J/MNRAS/502/818doi:10.26093/cds/vizier/bg-fp-sjCDSHoffman A.M.Murakami Y.S.Zheng W.Stahl B.E.Filippenko A.V.2026-08-03T07:31:16Z2023-11-16T08:31:26ZCDS support team

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

cds-question@unistra.frvariable-starsglobular-star-clustersvisible-astronomyWe present measurements of the periods, amplitudes, and types of 74 RR Lyrae stars in the globular cluster M15 derived from Nickel 1m telescope observations conducted at Lick Observatory in 2019 and 2020. Of these RR Lyrae stars, two were previously reported but without a determination of the period. In addition, we identify five Type II Cepheid variable stars for which we report three novel period determinations, and a further 34 stars with uncertain classifications and periods. We discuss the development and subsequent application to our data of a new PYTHON package, Period-determination and Identification Pipeline Suite (PIPS), based on a new adaptive free-form fitting technique to detect the periods of variable stars with a clear treatment of uncertainties.2021MNRAS.502..818Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/502/818CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/502/818https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/502/818http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/502/818https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/502/818https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/502/818http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/502/818GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/502/818/tablea1 (Results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/502/818/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/502/818/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/502/818/tablea1?GETtext/xml+votable180.050000true322.45912.1740.0055555555555555566/12405https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/502/818?format=asciiOpticaldefaultJ/MNRAS/502/818/tablea1ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (VNNNa)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainPBest-fitting period of the fundamental modedtime.perioddoublee_P? Error on Pdstat.errordoublenullableP2? Best-fitting period of the secondary pulsation modedtime.perioddoublenullablee_P2? Error on P2dstat.errordoublenullableA1Amplitude of the fundamental modemagsrc.var.amplitudefloatA2? Amplitude of the secondary pulsation modemagsrc.var.amplitudefloatnullableVmag? Mean V-band magnitudemagphot.mag;em.opt.VfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableTypeStar classificationsrc.classchar