J/ApJ/654/915ivo://CDS.VizieR/J/ApJ/654/915doi:10.26093/cds/vizier.16540915CDSSollima A.Ferraro F.R.Bellazzini M.Origlia M.Straniero O.,Pancino E.2007-03-18T12:38:47Z2007-03-18T13:37:08ZCDS support team

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

cds-question@unistra.frglobular-star-clustersinfrared-photometryvisible-astronomyWide-band photometrypopulation-ii-starsWe present the results of a deep photometric survey performed with the VLT FORS1 aimed at investigating the complex main-sequence structure of the stellar system Centauri. We confirm the presence of a double main sequence and identify its blue component (bMS) over a large field of view up to 26' from the cluster center. We found that bMS stars are significantly more concentrated toward the cluster center than the other "normal" MS stars. The bMS morphology and its position in the CMD have been used to constrain the helium overabundance required to explain the observed MS morphology.2007ApJ...654..915Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/654/915CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/250/314 : CCD photometry of omega Cen (Noble+ 1991)J/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)J/PASP/106/828 : BVRI photometry of Omega Cen (Walker 1994)J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)J/AJ/127/958 : CCD BV photometry on Omega Cen (Rey+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/654/915https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/654/915http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/654/915https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/654/915https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/654/915http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/654/915GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/654/915/fors1 ({omega} Cen BR catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/654/915/fors1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/654/915/fors1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/654/915/fors1?GETtext/xml+votable180.050000true201.50007629-47.671440120.0055555555555555566/43225 43227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/654/915?format=asciiOpticalInfrareddefaultJ/ApJ/654/915/fors1{omega} Cen BR catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/66618] Sequential numbermeta.id;meta.mainintBmag? Bessel B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Mean error on B magnitudemagstat.error;phot.mag;em.opt.BfloatnullableRmag? Bessel R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Mean error on R magnitudemagstat.error;phot.mag;em.opt.RfloatnullableRAJ2000Right Ascension J2000 (degrees)degpos.eq.ra;meta.mainindexedDEJ2000Declination J2000 (degrees)degpos.eq.dec;meta.mainindexed