J/PASP/121/1188ivo://CDS.VizieR/J/PASP/121/1188doi:10.26093/cds/vizier.61211188CDSSukhbold T.Howell S.B.2025-09-09T14:13:34Z2010-11-26T14:22:39ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryccd-photometryWe present the results of a search for periodic variables within 4078 time-series light curves and an analysis of the period-color plane for stars in the field of the open cluster NGC 2301. One hundred thirty-eight periodic variables were discovered, of which five are eclipsing binary candidates with unequal minima. The remaining 133 periodic variables appear to consist mainly of late-type stars whose variation is due to rotation modulated by star spot activity. The determined periods range from less than a day to over 14 days and have nearly unreddened B-R colors in the range of 0.8 to 2.8. The Barnes (2003ApJ...586..464B) interpretation of the period-color plane of late type stars is tested with our data. Our data did not show distinct I and C sequences, likely due to nonmember field stars contaminating in the background, as we estimate the total contamination to be 43%. Using different assumptions, the gyrochronological age of the cluster is calculated to be 210+/-25Myr, which falls in the range of age values (164-250Myr) determined by previous studies. Finally, we present evidence which nullifies the earlier suggestion that two of the variable stars in NGC 2301 might be white dwarfs.2009PASP..121.1188Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/121/1188CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/121/1188https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/121/1188http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/121/1188https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/121/1188https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/121/1188http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/121/1188GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/121/1188/table2 (The 133 additional periodic variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/121/1188/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/121/1188/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/121/1188/table2?GETtext/xml+votable180.050000true102.92660.4254090.0055555555555555566/22121 221232.762881831355591e-19 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/121/1188?format=asciiOpticalInfrareddefaultJ/PASP/121/1188/table2The 133 additional periodic variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable name (<Cl* NGC 2301 HVT "Name"> in Simbad)meta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainPerPerioddtime.periodfloatRampAmplitude in R bandmagarith.rate;phot.mag;em.opt.RdoubleRmagR magnitudemagphot.mag;em.opt.RfloatB-RB-R colour indexmagphot.color;em.opt.B;em.opt.RfloatSimbadSimbad column added by the CDSmeta.refchar