J/AJ/122/3219ivo://CDS.VizieR/J/AJ/122/3219doi:10.26093/cds/vizier.51223219CDSRey S.-C.Yoon S.-J.Lee Y.-W.Chaboyer B.Sarajedini A.2023-04-06T16:50:45Z2003-07-01T22:51:23ZCDS support team

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

cds-question@unistra.frglobular-star-clustersccd-photometryvisible-astronomyWide-band photometryWe present high-precision V, B-V color-magnitude diagrams (CMDs) for the classic second-parameter globular clusters M3 and M13 from wide-field, deep CCD photometry. The data for the two clusters were obtained during the same photometric nights with the same instrument, allowing us to determine accurate relative ages. Based on a differential comparison of the CMDs using the {Delta}(B-V) method, an age difference of 1.7+/-0.7Gyr is obtained between these two clusters. We compare this result with our updated horizontal-branch (HB) population models, which confirm that the observed age difference can produce the difference in HB morphology between the clusters. This provides further evidence that age is the dominant second parameter that influences HB morphology.2001AJ....122.3219Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/122/3219CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/290/69 : M3 photographic photometry (Buonanno+, 1994)J/A+A/320/757 : M3 stars CCD photometry (Ferraro+ 1997)J/AJ/108/1786 : Blue stragglers + variable stars in M3 (Guhathakurta+, 1994)J/PAZh/20/693 : Identification and coordinates in NGC 5272 (Evstigneeva+ 1994)J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)J/A+AS/102/397 : Colour magnitude diagram of M13 (Guarnieri+ 1993)J/AJ/113/669 : Stars in M13 core (Cohen+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/122/3219https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/122/3219http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/122/3219https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/122/3219https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/122/3219http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/122/3219GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/122/3219/table2 (CCD Photometry for M13)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/3219/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/3219/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/3219/table2?GETtext/xml+votable180.050000true250.295471436.51052170.0055555555555555566/9436https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/122/3219?format=asciiOpticaldefaultJ/AJ/122/3219/table1CCD Photometry for M3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRYLM3 identification number (Cl* NGC 5272 RYL NNNN)meta.id;meta.mainintXpixThe X pixel coordinate (G1)pixpos.cartesian.x;instr.detfloatYpixThe Y pixel coordinate (G1)pixpos.cartesian.y;instr.detfloatVmagThe V band magnitudemagphot.mag;em.opt.Vfloate_VmagThe uncertainty in Vmagmagstat.errorfloatB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloate_B-VThe uncertainty in B-Vmagstat.errorfloatJ/AJ/122/3219/table2CCD Photometry for M13recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRYLM13 identification number (Cl* NGC 6205 RYL NNNN)meta.id;meta.mainintXpixThe X pixel coordinate (G1)pixpos.cartesian.x;instr.detfloatYpixThe Y pixel coordinate (G1)pixpos.cartesian.y;instr.detfloatVmagThe V band magnitudemagphot.mag;em.opt.Vfloate_VmagThe uncertainty in Vmagmagstat.errorfloatB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloate_B-VThe uncertainty in B-Vmagstat.errorfloat_RAPositions computed from (Xpix, Ypix) (right ascension part)degpos.eq.ra;meta.main_DEPositions computed from (Xpix, Ypix) (declination part)degpos.eq.dec;meta.main