J/A+A/349/448ivo://CDS.VizieR/J/A+A/349/448doi:10.26093/cds/vizier.33490448CDSSanner J.Geffert M.Brunzendorf J.Schmoll J.1999-10-18T13:19:33Z1999-10-18T13:18:58ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometryvisible-astronomybroad-band-photometryproper-motionsWe present CCD photometry and a proper motion study of the young open star cluster, NGC 581 (M 103). Fitting isochrones to the colour magnitude diagram, we found an age of 16+/-4Myr and a distance of roughly 3kpc for this cluster. The proper motion study identifies 77 stars of V=14.5mag or brighter to be cluster members. We combine membership determination by proper motions and statistical field star subtraction to derive the IMF of the cluster and find a quite steep slope of {Gamma}=-1.80.1999A&A...349..448Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/349/448CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+A/357/471 : Open star clusters. II. NGC 1960 + NGC 2194 (Sanner+, 2000)J/A+A/369/511 : Open star clusters. III. NGC 4103, 5281, 4755 (Sanner+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/349/448https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/349/448http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/349/448https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/349/448https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/349/448http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/349/448GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/349/448/table7 (Proper motions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/349/448/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/349/448/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/349/448/table7?GETtext/xml+votable180.050000true22.9326560.680416670.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/349/448?format=asciiOpticaldefaultJ/A+A/349/448/table4BV photometrySeqStar numberintprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intxposX position on CCD (1)pixdoubleyposY position on CCD (1)pixdoubleB-VB-V colourmagfloatVmagV magnitudemagfloate_BmagPhotometric error in Bmagfloate_VmagPhotometric error in VmagfloatJ/A+A/349/448/table7Proper motionsSeqStar numberintprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intRA2000Right ascension (2000.0)DE2000Declination (2000.0)pmRAProper motion in RA (mu_alpha cos delta)mas/yrfloatpmDEProper motion in DEmas/yrfloat