J/MNRAS/299/834ivo://CDS.VizieR/J/MNRAS/299/834doi:10.26093/cds/vizier.72990834CDSTosi M.Pulone L.Marconi G.Bragaglia A.2024-06-25T20:18:09Z2005-08-18T21:41:26ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe present CCD BVI photometry of the old open cluster Berkeley 21, one of the most distant clusters in the Galactic anticentre direction, and possibly the lowest metallicity object in the open clusters sample. Its position and metal abundance make it very important for the study of the Galactic disc. Using the synthetic colour-magnitude diagram method, we estimate values for the distance modulus (m-M)_0_=13.4-13.6, reddening E(B-V)=0.74-0.78 (with possible differential absorption), and age= 2.2-2.5Gyr.1998MNRAS.299..834Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/299/834CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/299/834https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/299/834http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/299/834https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/299/834https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/299/834http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/299/834GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/299/834/table (Photometry BVIc and positions for 1567 stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/299/834/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/299/834/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/299/834/table?GETtext/xml+votable180.050000true87.8967886121.841941940.0055555555555555566/24330https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/299/834?format=asciiOpticalInfrareddefaultJ/MNRAS/299/834/tablePhotometry BVIc and positions for 1567 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTPMIdentification number (Cl* Berkeley 21 TPM NNNN in Simbad)intVmagV magnitude (1)magfloatV-IcCousins V-I colour indexmagfloatB-V? B-V colour indexmagfloatnullableXpixX position (1pix=0.377")pixfloatYpixY position (1pix=0.377")pixfloat_RAPosition (computed from Xpix and Ypix, the original position being inaccurate) (right ascension part)degpos.eq.ra;meta.main_DEPosition (computed from Xpix and Ypix, the original position being inaccurate) (declination part)degpos.eq.dec;meta.main