J/AJ/158/35ivo://CDS.VizieR/J/AJ/158/35doi:10.26093/cds/vizier.51580035CDSSiegel M.H.LaPorte S.J.Porterfield B.L.Hagen L.M.Z.Gronwall C.A.2020-12-23T07:39:09Z2019-09-13T14:25:59ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersultraviolet-photometryvisible-astronomybroad-band-photometrymetallicitysurveysAs part of the Swift/Ultraviolet-Optical Telescope Stars Survey, we present near-ultraviolet (NUV; 3000-1700 {AA}) point-source photometry for 103 Galactic open clusters. These data, taken over the span of the mission, provide a unique and unprecedented set of NUV point-source photometry on simple stellar populations. After applying a membership analysis fueled mostly by Gaia DR2 (Cat. I/345) proper motions, we find that 49 of these 103 have clear precise color-magnitude diagrams (CMDs) amenable to investigation. We compare the CMDs to theoretical isochrones and find good agreement between the theoretical isochrones and the CMDs. The exceptions are the fainter parts of the main sequence and the red giant branch in the uvw2-uvw1 CMDs, which is most likely due to either the difficulty of correcting for the red leak in the uvw2 filter or limitations in our understanding of UV opacities for cool stars. For the most part, our derived cluster parameters - age, distance, and reddening - agree with the consensus literature, but we find a few clusters that warrant substantial revision from literature values, notably NGC 2304, NGC 2343, NGC 2360, NGC 2396, NGC 2428, NGC 2509, NGC 2533, NGC 2571, NGC 2818, Collinder 220, and NGC 6939. A number of these are clusters in the third Galactic quadrant, where previous studies may have mistaken the disk sequence for the cluster. However, the Gaia DR2 proper motions clearly favor a different sequence. A number of clusters also show white dwarf and blue straggler sequences. We confirm the presence of extended main-sequence turnoffs in NGC 2360 and NGC 2818 and show hints of them in a number of other clusters that may warrant future spectroscopic study. Most of the clusters in the study have low extinction, and the rest are well fit by a "Milky Way-like" extinction law. However, Collinder 220 hints at a possible "LMC-like" extinction law. We finally provide a comprehensive point-source catalog to the community as a tool for future investigation.2019AJ....158...35Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/158/35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/102/642 : UBV photometry in Westerlund 2 (Moffat+, 1991)J/A+AS/94/73 : UBVI Photometry in 7 open clusters (Ramsay+ 1992)J/AJ/106/220 : UBVI photometry in Berkeley 31 (Guetter 1993)J/AJ/106/1533 : NGC 2287 (Harris+, 1993)J/ApJS/93/187 : UBV Photometry in NGC 7419 (Beauchamp+ 1994)J/PASP/106/281 : Photometry and radial velocities in NGC752 (Daniel+, 1994)J/AJ/111/1193 : Proper motion in M34 (Jones+ 1996)J/AJ/113/1723 : UBVI photometry in 4 open clusters (Kassis+, 1997)J/A+A/375/30 : Radial velocities in open clusters (Mermilliod+, 2001)J/A+A/381/884 : UBVI CCD photometry in NGC 2571 (Giorgi+, 2002)J/A+A/404/927 : UBVRI photometry of NGC 2422 (Prisinzano+, 2003)J/MNRAS/346/390 : VI and CMT1 photometry of NGC 2627 (Piatti+, 2003)J/AJ/127/1000 : Stromgren and Ca photometry of NGC 3680J/AJ/127/2210 : u'g'r'i'z' photometry in NGC 2548 (M48) (Rider+, 2004)J/A+A/437/457 : NGC 2548 uvbyH{beta} and proper motionsJ/AN/326/3 : BVRI photometry of 4 open clusters (Ahumada+, 2005)J/AJ/131/461 : Stromgren photometry of NGC 2420 (Anthony-Twarog+, 2006)J/AJ/132/1669 : Wide-field CCD phot. around nine open clustersJ/A+A/463/789 : Blue stragglers in open clusters (Ahumada+, 2007)J/A+A/464/573 : VI photometry of 5 open clusters (Carraro+, 2007)J/AJ/134/1216 : Abundances of NGC 7142, 6939, and IC 4756 starsJ/A+A/480/79 : Abundances of giants in five Galactic clustersJ/A+A/485/303 : Radial velocities for 1309 stars and 166 OClJ/AN/329/609 : Red giant candidates in 10 open clusters (Claria+, 2008)J/A+A/504/681 : Integrated BVJHKs for 650 open clusters (Kharchenko+, 2009)J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)J/MNRAS/401/621 : UBVRI photometry in Be 15, Be 80 and NGC 2192 (Tapia+, 2010)J/MNRAS/402/2720 : UBVI photometry of 5 open clusters (Piatti+, 2010)J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)J/MNRAS/412/1265 : Photometry of 3 open clusters (Andreuzzi+, 2011)J/A+A/548/A122 : Berkeley 39 stars photometry and abundancesJ/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)J/A+A/558/A53 : Milky Way global survey of star clusters. II.J/MNRAS/431/3338 : Abundances of red giants in open clusters (Reddy+, 2013)J/A+A/562/A54 : Galactic open clusters in RAVE (Conrad+, 2014)J/AJ/147/139 : UBVRI CCD photometry of open clusters. II. NGC 6866J/AJ/148/83 : Spectroscopy in NGC 2360, NGC 3680, and NGC 5822J/AJ/150/129 : Swift UVOT stars survey. II. RR Lyrae in M3 and M15J/AJ/150/134 : uvbyCaH{beta} photometry of NGC 752 (Twarog+, 2015)J/MNRAS/446/3562 : Abundances of red giants in NGC752 (Bocek Topcu+, 2015)J/MNRAS/450/4301 : Line list for red giants in open clusters (Reddy+, 2015)J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)J/MNRAS/453/4185 : NGC 2355 BVI photometry (Donati+, 2015)J/PASP/127/31 : CCD photometry of NGC 2482 (Krisciunas+, 2015)J/A+A/585/A101 : Milky Way global survey of star clusters. V.J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)J/AJ/152/192 : WOCS. LXXII. A uvbyCaHb study of NGC 2506J/MNRAS/469/3042 : Metallicities in the Geneva photometric systemJ/A+A/618/A59 : Gaia DR2 confirmed new nearby open clustersJ/A+A/618/A93 : Gaia DR2 open clusters in the Milky WayJ/AJ/155/138 : WOCS.LXXVI.Velocity & abundances in NGC2506J/ApJ/854/184 : Abundances of stars in 3 open clusters (Pena Suarez+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/158/35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/158/35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/158/35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/158/35https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/158/35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/158/35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/158/35/table1 (Swift/UVOT observations of open clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/158/35/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/158/35/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/158/35/table1?GETtext/xml+votable180.050000true1.0291667-29.83333330.0055555555555555566/2395 2436 3307 4078 4298 6149 6691 6760 6817 12510 13049 13952 14033 14059 14353 14575 14622 14749 15376 15396 15432 15434 15595 16490 20562 20763 20797 20814 20853 20903 21471 21520 21523 21529 21531 21538 21549 21561 21586 21647 21719 21774 22021 22097 22111 22123 22139 22222 22252 22433 22478 22499 23577 23601 23633 23861 23906 24448 24483 28828 29523 37246 37343 37351 37594 37745 37753 37789 37919 37923 37924 37930 38073 38242 39131 39354 39356 39374 39766 39775 39901 39930 39956 40071 40101 40104 40106 40490 40601 40625 40696 41599 41699 42159 42170 42206 42365 42438https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/158/35?format=asciiUVOpticaldefaultJ/AJ/158/35/table1Swift/UVOT observations of open clustersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster identifiermeta.id;meta.maincharprimarymoreindicates parameters of cluster in Table 2meta.ref.urlcharONameAlternative cluster identifiermeta.idcharExp-u[0/99634] Swift/UVOT u band exposure timekstime.duration;obs.exposureintExp-uvw1[0/62519] Swift/UVOT uvw1 band exposure timekstime.duration;obs.exposureintExp-uvm2[0/63788] Swift/UVOT uvm2 band exposure timekstime.duration;obs.exposureintExp-uvw2[0/119992] Swift/UVOT uvw2 band exposure timekstime.duration;obs.exposureintDate1Beginning observation datetime.start;obsnullableDate2End observation datetime.end;obsnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/AJ/158/35/table2Parameters of clusters in this studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster identifiermeta.id;meta.maincharm-M[8.01/13.6] Distance modulusmagphot.mag.distModfloatE(B-V)[0/0.83] The (B-V) color excessmagphot.color.excessfloatf_E(B-V)[a] Flag on E(B-V) (1)meta.codecharf_log(Age)[< =] Limit flag on log(Age)meta.codecharlog(Age)[7.0/9.75] Log agelog(yr)time.agefloat[Fe/H][-0.5/0.1] Metallicitylog(Sun)phys.abund.ZfloatSourceData source(s) (2)meta.bibchar