J/AJ/167/262ivo://CDS.VizieR/J/AJ/167/262doi:10.26093/cds/vizier.51670262CDSSpeckert M.Massey P.Skiff B.A.2024-11-06T20:20:15Z2024-06-28T07:43:19ZCDS support team

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

cds-question@unistra.fropen-star-clustersb-starssupergiant-starsphotometryvisible-astronomyspectroscopytrigonometric-parallaxproper-motionsWe observed the Galactic open cluster Berkeley-50 in order to determine its stellar content, distance, and age. We obtained UBV photometry of 1145 stars in a 12.3x12.3' field, and used Gaia proper motions and parallaxes to identify 64 members, of which we obtained spectra of the 17 brightest members. The majority of the observed population we classified as Bdwarfs, with the exception of a newly identified red supergiant star, which our spectroscopy shows has a B-type companion. Our study establishes the distance as 3.8kpc, with an average color-excess E(B-V)=0.9. Comparison of the physical properties of the cluster with the Geneva evolutionary tracks places the age of the cluster as 50-60Myr, with its most massive members being ~7M{sun}.2024AJ....167..262Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/262CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)II/183 : UBVRI Photometric Standards (Landolt 1992)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/ApJ/576/880 : CCD UBV photometry of h and {chi} Per (Slesnick+, 2002)J/MNRAS/389/285 : Proper motions & JHK of 24 Berkeley clusters (Tadross, 2008)J/A+A/537/A146 : Stellar models with rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)J/A+A/543/A156 : Milky Way global survey of star clusters (Kharchenko+, 2012)J/AJ/156/121 : Catalog of 518 likely open cluster NGC6405 member (Gao, 2018)J/ApJ/873/91 : Interferometric obs. B-type stars with CHARA (Gordon+, 2019)J/ApJ/875/124 : Binary red supergiants. II. Btype companions (Neugent+, 2019)J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)J/ApJ/900/118 : RSGs in LMC & sp. follow-up for LMC & SMC (Neugent+, 2020)J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)J/ApJ/908/87 : 182 RSGs and OB-stars in M31 and M33 (Neugent, 2021)J/A+A/673/A114 : Improving the open cluster census. II. (Hunt+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/262https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/262http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/262https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/262https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/262http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/262GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/167/262/table1 (Stars measured in our LMI field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/262/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/262/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/262/table1?GETtext/xml+votable180.050000true302.39312534.97672220.0055555555555555566/14628https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/167/262?format=asciiOpticaldefaultJ/AJ/167/262/table1Stars measured in our LMI fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identifiermeta.id;meta.maincharprimaryrho[0.1/8.83] Angular separation from the RSGarcminpos.angDistancefloatRAJ2000[20] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[34/35] Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[10.6/19.7] Apparent V magnitudemagphot.mag;em.opt.VfloatB-V[0.17/2.79] B-V colormagphot.color;em.opt.B;em.opt.Vfloatplx[-0.62/5.87]? Gaia DR3 parallax (1)maspos.parallax.trigfloatnullablepm[0.1/53.1]? Gaia DR3 proper motion (1)mas/yrpos.pmfloatnullablepmRA[-52.76/29.45]? Gaia DR3 proper motion in Right Ascension (1)mas/yrpos.pm;pos.eq.rafloatnullablepmDE[-39.66/18.29]? Gaia DR3 proper motion in Declination (1)mas/yrpos.pm;pos.eq.decfloatnullableCluster?Cluster member (table2)meta.ref.urlcharJ/AJ/167/262/table2Cluster membersStarStar identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeSpectral typesrc.spTypecharVmag[11.96/18.74] Apparent V magnitudemagphot.mag;em.opt.VfloatB-V[0.63/2.06] B-V colormagphot.color;em.opt.B;em.opt.VfloatVMag[-3.73/3.05] Absolute V magnitudemagphys.magAbsfloat[Teff][3.58/4.184] Log of effective temperaturelog(K)phys.temperature.effectivefloat[Lum][0.76/3.8] Log of luminositylog(solLum)phys.luminosityfloat