J/A+A/352/605ivo://CDS.VizieR/J/A+A/352/605doi:10.26093/cds/vizier.33520605CDSKaltcheva N.T.Olsen E.H.Clausen J.V.1999-12-18T22:01:10Z1999-12-18T23:00:04ZCDS support team

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

cds-question@unistra.frvisible-astronomymedium-band-photometryearly-type-starsStroemgren and H{beta} photometry of O and B type stars, generally brighter than 10mag is presented for the fields of the galactic OB associations Monoceros OB2, Canis Major OB1 and Collinder 121. The observations are based on the PPM catalogue identifications and are designed to improve the completeness of the existing uvby{beta} data for the bright early-type stars in these fields. We present new uvby photometry for 343 stars and H{beta} photometry for 213 of them. These observations are part of our effort to study the structure of selected star-forming regions in the Milky Way, utilizing uvby{beta} photometry.1999A&A...352..605Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/352/605CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/146 : Positions and Proper Motions - North (Roeser+, 1988)I/193 : Positions and Proper Motions - South (Bastian+ 1993)I/208 : The 90000 stars Supplement to the PPM Cat. (Roeser+, 1994)J/A+A/352/600 : O & B stars uvby-Hbeta photometry. I. (Kaltcheva+, 1999)J/A+AS/146/365 : O + B stars uvby-Hbeta photometry. III. (Kaltcheva+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/352/605https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/352/605http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/352/605https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/352/605https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/352/605http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/352/605GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/352/605/stars (Star positions from Simbad database)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/352/605/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/352/605/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/352/605/stars?GETtext/xml+votable180.050000true93.2433334.8561110.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/352/605?format=asciiOpticaldefaultJ/A+A/352/605/table4Hbeta cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSimbadask the SIMBAD data-base about this objectcharPPMPPM (Cat. <I/146> & <I/193>) numberintprimaryHbetaH{beta} indexmagfloate_HbetaInternal rms errors of one observation (weight 1) on H{beta} indexmagfloatw_HbetaWeight of H{beta} indexinto_HbetaNumber of the nights for each starintFieldThe field where the star is locatedcharJ/A+A/352/605/starsStar positions from Simbad databaserecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSimbadask the SIMBAD data-base about this objectcharRAJ2000Right ascension (J2000.0)DEJ2000Declination (J2000.0)PPMPPM (Cat. <I/146> & <I/193>) designationintprimaryJ/A+A/352/605/table3uvby cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSimbadask the SIMBAD data-base about this objectcharPPMPPM (Cat. <I/146> & <I/193>) numberintprimaryVmagMagnitude transformed to the standard Johnson V magnitudemagfloate_Vmagrms uncertainty on Vmag (1)magfloat(b-y)Stroemgren colour indexmagfloate_(b-y)rms uncertainty on (b-y) (1)magfloatm1m1 = (v-b) - (b-y) colour indexmagfloate_m1rms uncertainty on m1 (1)magfloatc1c1 = (u-v) - (v-b) colour indexmagfloate_c1rms uncertainty on c1 (1)magfloatw_VmagWeight of Vmagintw_m1Weight of 4-colour indicesinto_VmagNumber of the nights for each starintFieldThe field where the star is locatedchar