J/MNRAS/509/2885ivo://CDS.VizieR/J/MNRAS/509/2885doi:10.26093/cds/vizier.75092885CDSRodriguez-Segovia N.Hajdu G.Catelan M.Espinoza-Arancibia F.,Boggiano G.Cenzano C.Garces E.H.Joachimi K.Munoz-Lopez C.,Ordenes-Huanca C.Orquera-Rojas C.Torres P.Valenzuela-Navarro A.2025-02-12T20:12:00Z2024-10-11T14:40:58ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsvisible-astronomyphotometryastrometryThe period-change rate (PCR) of pulsating variable stars is a useful probe of changes in their interior structure, and thus of their evolutionary stages. So far, the PCRs of classical Cepheids in the Large Magellanic Cloud (LMC) have been explored in a limited sample of the total population of these variables. Here, we use a template-based method to build observed-minus-computed (O - C) period diagrams, from which we can derive PCRs for these stars by taking advantage of the long time baseline afforded by the Digital Access to a Sky Century @Harvard light curves, combined with additional data from the Optical Gravitational Lensing Experiment, the MAssive Compact Halo Object project, Gaia's Data Release 2, and in some cases the All-Sky Automated Survey. From an initial sample of 2315 sources, our method provides an unprecedented sample of 1303 LMC classical Cepheids with accurate PCRs, the largest for any single galaxy, including the Milky Way. The derived PCRs are largely compatible with theoretically expected values, as computed by our team using the Modules for Experiments in Stellar Astrophysics code, as well as with similar previous computations available in the literature. Additionally, five long-period (P > 50 d) sources display a cyclic behaviour in their O - C diagrams, which is clearly incompatible with evolutionary changes. Finally, on the basis of their large positive PCR values, two first-crossing Cepheid candidates are identified.2022MNRAS.509.2885Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/509/2885CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/65/297 : OGLE4 LMC and SMC Cepheids (Soszynski+, 2015)J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)II/264 : ASAS Variable Stars in Southern hemisphereJ/AcA/62/247 : LMC photometric maps from OGLE-III shallow surveyI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/509/2885https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/509/2885http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/509/2885https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/509/2885https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/509/2885http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/509/2885GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/509/2885/table2 (Computed period-change rates (PCRs) for our 1303 variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/509/2885/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/509/2885/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/509/2885/table2?GETtext/xml+votable180.050000true68.881335-69.734943890.0055555555555555564/2068 5/8263 8268-8269 8276 8278 8280-8281 6/33046-33047 33049-33051 33081 33084-33085 33108 33110-33111 33116-33118 33128-33129 33132 33136-33138 37504 37514-37515 37536-37538 37544https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/509/2885?format=asciiOpticaldefaultJ/MNRAS/509/2885/table2Computed period-change rates (PCRs) for our 1303 variablesDataData available for the source code (Data) (2)meta.codecharNFsNumber of terms in Fourier series used for building the light curve (Fourier) (3)meta.numberintTemplateData used to build the light curve template (Template) (2)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarOGLE-IV identifier following the format OGLE-LMC-CEP-NNNN (Source) (1)meta.id;meta.mainintRAJ2000Right Ascension provided by OGLE (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination provided by OGLE (J2000) (Dec)degpos.eq.dec;meta.mainPP_OGLE_ equal to OGLE-IV periods used for creating the light curve template (P_OGLE_)dinstr.setupdoubledP/dtComputed period-change rate PCR rounded to one decimal (PCR)d/Myrarith.rate;time.periodfloate_dP/dtUncertainty adopted as the mean and standard deviation of the marginalized posterior distribution rounded to one decimal (err_PCR)d/Myrstat.errorfloatSimbadNameSimbad column added by the CDSmeta.idcharnullable