J/AJ/165/79ivo://CDS.VizieR/J/AJ/165/79doi:10.26093/cds/vizier.51650079CDSYontan T.2024-02-12T10:50:41Z2023-06-15T08:11:00ZCDS support team

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

cds-question@unistra.fropen-star-clustersvisible-astronomybroad-band-photometrytrigonometric-parallaxproper-motionsWe performed detailed photometric and astrometric analyses of the open star clusters Berkeley68 and Stock20. This was based on ground-based CCD UBV photometric data complemented by space-based Gaia Data Release 3 (DR3) photometry and astrometry. A total of 198 and 51 stars were identified as likely cluster members for Berkeley68 and Stock20, respectively. Two-color diagrams were used to derive the reddening and photometric metallicity for each cluster. The reddening for Berkeley68 and Stock20 is E(B-V)=0.520{+/-}0.032mag and 0.400{+/-}0.048mag, respectively. Photometric metallicity [Fe/H] is -0.13{+/-}0.08dex for Berkeley68 and -0.01{+/-}0.06dex for Stock20. Keeping as constant reddening and metallicity, we determined the distance moduli and ages of the clusters through fitting isochrones to the UBV and Gaia-based color-magnitude diagrams. Photometric distances are d=3003{+/-}165pc for Berkeley68 and 2911{+/-}216pc for Stock20. The cluster ages are 2.4{+/-}0.2Gyr and 50{+/-}10Myr for Berkeley68 and Stock20, respectively. Present-day mass function slopes were found to be {Gamma}=1.38{+/-}0.71 and {Gamma}=1.53{+/-}0.39 for Berkeley68 and Stock20, respectively. These values are compatible with the value of Salpeter. The relaxation times were estimated as 32.55 and 23.17Myr for Berkeley68 and Stock20, respectively. These times are less than the estimated cluster ages, indicating that both clusters are dynamically relaxed. Orbit integration was carried out only for Berkeley68 since radial velocity data were not available for Stock20. Analysis indicated that Berkeley68 was born outside the solar circle and belongs to the thin-disk component of the Milky Way.2023AJ....165...79Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+AS/133/387 : NGC 1817 and NGC 1807 proper motions (Balaguer-Nunnez+ 1998)J/AJ/115/592 : VI photometry of NGC 2157 (Fischer+, 1998)J/A+A/329/101 : Masses of Pleiades members (Raboud+ 1998)J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)J/AJ/137/4186 : UBVRI standards around celestial equator (Landolt, 2009)J/AJ/141/92 : BVI photometry of 10 distant open clusters (Janes+, 2011)J/A+A/543/A156 : Milky Way global survey of star clusters (Kharchenko+, 2012)J/MNRAS/436/1465 : Star clusters distances and extinctions (Buckner+, 2013)J/MNRAS/430/3350 : Proper motions and membership in NGC 3766 (Yadav+, 2013)J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)J/other/ApSS/355.267 : NGC 6811 CCD UBVRI photometry (Yontan+, 2015)J/other/ApSS/361.126 : NGC 6819 CCD UBV photometry (Ak+, 2016)J/other/ASpR/58.1900 : NGC 225 CCD UBV photometry (Bilir+, 2016)J/AJ/153/99 : Galactic outer disk field toward Tombaugh 1 (Carraro+, 2017)J/A+A/618/A93 : Gaia DR2 open clusters in Milky Way (Cantat-Gaudin+, 2018)J/A+A/618/A59 : Gaia DR2 new nearby open clusters (Castro-Ginard+, 2018)J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)J/A+A/624/A126 : New open clusters Perseus direction (Cantat-Gaudin+, 2019)J/A+A/627/A35 : New open clusters Galactic anticentre (Castro-Ginard+, 2019)J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019)J/MNRAS/487/2385 : Distances and ages of 150 open clusters (Monteiro+, 2019)J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)J/A+A/635/A45 : 570 new open cluster in Galactic disc (Castro-Ginard+, 2020)J/A+A/640/A127 : Open cluster properties with Gaia and LAMOST (Zhong+, 2020)J/other/ApSS/366.68 : Czernik 2 & NGC 7554 CCD UBV photometry (Akbulut+, 2021)J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)J/A+A/652/A102 : 3794 open clusters parameters (Hao+, 2021)J/other/RAA/21.93 : 74 new open clusters found in Gaia DR2 (He+, 2021)J/A+A/651/A104 : Spiral arms Gaia EDR3 (Poggio+, 2021)J/AJ/162/146 : Kinematic & photometry of King 11, Gaia EDR3 (Sariya+, 2021)J/A+A/647/A19 : 3D Kinematics and age of OCs (Tarricq+, 2021)J/AN/342/538 : Frolov 1 and NGC 7510 CCD UBV photometry (Yontan+, 2021)J/AJ/163/191 : Photometry & astrometry in NGC1664 and NGC6939 (Koc+, 2022)J/other/RMxAA/58.333 : NGC 1193 and NGC 1798 CCD UBV photometry (Yontan+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/79https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/79/table5 (The catalogs for Berkeley 68 and Stock 20)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/79/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/79/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/79/table5?GETtext/xml+votable180.050000true70.880708342.17939440.0055555555555555566/1446 1452 30591.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/79?format=asciiOpticaldefaultJ/AJ/165/79/table5The catalogs for Berkeley 68 and Stock 20recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/3548] Stellare identifier within the clustermeta.id;meta.mainintRAJ2000[0/4] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[41/62] Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[9.2/22.9] Apparent V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.001/0.5] Uncertainty in Vmagmagstat.error;phot.magfloatU-B[-3.42/2.05]? The (U-B) colormagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B[0.001/0.6]? Uncertainty in U-Bmagstat.error;phot.color;em.opt.UfloatnullableB-V[-1.38/3.97] The (B-V) colormagphot.color;em.opt.B;em.opt.Vfloate_B-V[0.001/0.8] Uncertainty in B-Vmagstat.error;phot.color;em.opt.BfloatGmag[9.07/21.7]? Gaia DR3 apparent G band colormagphot.mag;em.optfloatnullablee_Gmag[0.003/0.05]? Uncertainty in Gmagmagstat.error;phot.magfloatnullableBP-RP[-0.19/4.06]? Gaia DR3 Blue-Red passband colormagphot.color;em.opt.B;em.opt.Rfloatnullablee_BP-RP[0.005/0.74]? Uncertainty in BP-RPmagstat.errorfloatnullablepmRA[-85/218]? Gaia DR3 proper motion along RAcosDEmas/yrpos.pm;pos.eq.radoublenullablee_pmRA[0.008/2]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-174/37.3]? Gaia DR3 proper motion along DEmas/yrpos.pm;pos.eq.decdoublenullablee_pmDE[0.009/2]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableplx[-3.52/24.1]? Gaia DR3 parallaxmaspos.parallax.trigfloatnullablee_plx[0.009/2]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullableProb[0/1]? Membership probabilitystat.probabilityfloatnullableClusterCluster identifier Berkeley 68 (B68) or Stock 20 (S20)meta.id.parentchar