J/A+A/695/A164ivo://CDS.VizieR/J/A+A/695/A164doi:10.26093/cds/vizier/bc-nq/lbgeCDSCruz Reyes M.Anderson I.R.Das S.2026-08-28T11:55:52Z2025-03-18T11:08:29ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starspopulation-ii-starsWe have identified a sample of 88 bona fide population II Cepheids (henceforth: Cepheids) and 44 candidates in Galactic globular clusters (GCs). Seventy-eight of the Cepheids in the sample align within 2{sigma} of the period-luminosity relation for Milky Way Type II Cepheids (T2CEP). Nine align with the period-luminosity relation for fundamental-mode Anomalous Cepheids (ACEPs), and only one (BL Bootis) follows the relation for first-overtone ACEPs determined using the Large Magellanic Cloud. For sources in common between our catalog and the OGLE catalog, the classification agrees in 94% of cases. In comparison, for sources shared between Gaia SOS and OGLE, the agreement is 74%. In the dense environments of GCs, our analysis shows that the completeness of the Gaia catalogs for Cepheids is 64% for the SOS (Specific Object Study) and 74% for the classifier of variable stars. Using linear MESA-RSP models, we determined the red and blue edges of the instability strip for T2CEPs. We found that the models providing the best fit to the observations are able to fit 90% of the stars in our sample. They have the following parameters: M=0.6M_{sun}_, Z=0.0003, and this percentage does not change for two different values of the helium abundance (Y=0.220 and 0.245). Higher values of Y lower this percentage, and the same effect is observed with lower values of Z. In the future, combining the sample of T2CEPs with the precise parallaxes obtained from GCs will strengthen the geometric calibration of a distance ladder based on Population II stars. This will be useful for determining distances within the Milky Way and for cross-checking distances to Local Group galaxies determined through other methods.2025A&A...695A.164Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A164CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/AcA/70/101 : OGLE IV Galactic Cepheids (Soszynski+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A164https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A164http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A164https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A164https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A164http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A164GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/695/A164/tablea1 (Cepheids in globular clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A164/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A164/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A164/tablea1?GETtext/xml+votable180.050000true114.530018528030438.91281919405850.0055555555555555566/6389 9436 9666 10008 10321 10336 12405 12425 12531 14489 19091 21017 27237 28705 28717 28769 28778 28815 28817 28838 28877 28970 28972-28973 29184 29195 29216 29222 29233 29248 29377 29632 30329 30998 31019 31043 31115 31416-31417 33321 37294 41257 42314 42336 42466 42700 42841 42990 43125 43227 43230 44220 44427 47127 47168 47777 48035https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A164?format=asciidefaultJ/A+A/695/A164/tablea1Cepheids in globular clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmoreindicates more informations in table A2meta.ref.urlcharGaiaDR3Gaia DR3 source_idmeta.id;meta.maincharprimaryRA_ICRSGaia DR3 Barycentric right ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainDE_ICRSGaia DR3 Barycentric declination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainClusterCluster namemeta.id.parentcharLike? Likelihoodstat.likelihoodfloatnullablePrior[0/1] Prior probabilitystat.fit.goodnessfloatPosterior[0/1]? Posterior probabilitystat.fit.goodnessfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableClassClassification assigned in this studymeta.code.classcharFinal[False True] A Boolean column that specifies whether the star is part of Final sample of Cepheids in clustersmeta.codecharCand[False True] A Boolean column identifying Cepheids whose membership could not be confirmeddegmeta.codecharPeriod? Pulsation period used to determine the classificationdmeta.code.classdoublenullableSOS[False True] Boolean column indicating whether SOS photometry is available in the Gaia archivemeta.codecharJ/A+A/695/A164/tablea2Cepheid identifiers and their assigned classification in other catalogsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 source_idmeta.id;meta.maincharClusterCluster namemeta.id.parentcharC17Identifier in the Clement (2017EPJWC.15201021C) catalogmeta.idcharOGLEIdentifier in the OGLE IV catalog, OGLE-BLG-T2CEP-NNNN or OGLE-GD-T2CEP-NNNmeta.idcharClassSOSClassification assigned in the SOS catalogmeta.code.classcharClassC17Classification assigned in the C17 catalogmeta.code.classcharClassClassification assigned by the classifier of variable sources of Gaia (DR3)meta.code.classcharG23Primary classification assigned in the G23 catalogmeta.code.classchar