J/A+A/390/931ivo://CDS.VizieR/J/A+A/390/931doi:10.26093/cds/vizier.33900931CDSOrtolani S.Bica E.Barbuy B.Momany Y.2002-08-22T22:16:38Z2002-08-22T22:16:31ZCDS support team

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

cds-question@unistra.fropen-star-clustersphotometryPismis 23 and Stephenson 2 are two very reddened open clusters, projected close to the Galactic plane. We present VI and JH photometry for Pismis 23 and I and Gunn z for Stephenson 2. We derive a relatively old age of ~700Myr for Pismis 23, with a reddening value of E(B-V)=1.73 and a distance d_{sun}_~2.6kpc from the Sun. Stephenson 2 has a clump of red supergiants, indicating a young age of about 20Myr, somewhat younger and more distant (d_{sun}_~6kpc) than recently reported in the literature. The age estimate for such a young object is crucial for the distance estimate. The high reddening of these two clusters relative to predictions from the diffuse interstellar medium at their distances is due to discrete intervening clouds.2002A&A...390..931Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/390/931CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/390/931https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/390/931http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/390/931https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/390/931https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/390/931http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/390/931GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/390/931/pismis23X,Y and V,I photometry of Pismis 23SeqSequence numbermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposx pixel coordinate in V image (1)pixpos.cartesian.x;instr.detfloatYposy pixel coordinate in V image (1)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.VfloatV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.IfloatJ/A+A/390/931/stephen2X,Y and I photometry of Stephenson 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequence numbermeta.idintXposx pixel coordinate as in Fig. 1 (1)pixpos.cartesian.x;instr.detfloatYposy pixel coordinate as in Fig. 1 (1)pixpos.cartesian.y;instr.detfloatIcmagKron-Cousins I magnitudemagphot.mag;em.opt.Ifloat