J/MNRAS/367/1441ivo://CDS.VizieR/J/MNRAS/367/1441doi:10.26093/cds/vizier.73671441CDSBaume G.Moitinho A.Vazquez R.A.Solivella G.Carraro G.Villanova S.2024-07-02T20:17:07Z2006-06-23T09:08:56ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryBased on a deep optical CCD (UBV(RI)_C) photometric survey and on the Two-Micron All-Sky-Survey (2MASS, <II/246>) data we derived the main parameters of the open cluster NGC 2401. We found this cluster is placed at 6.3+/-0.5kpc (Vo-Mv=14.0+/-0.2) from the Sun and is 25Myr old, what allows us to identify NGC 2401 as a member of the young population belonging to the innermost side of the extension of the Norma-Cygnus spiral-arm in the Third Galactic Quadrant. A spectroscopic study of the emission star LSS 440 that lies in the cluster area revealed it is a B0Ve star; however, we could not confirm it is a cluster member. We also constructed the cluster luminosity function (LF) down to V~22 and the cluster initial mass function (IMF) for all stars with masses above M~1-2M_{sun}_. It was found that the slope of the cluster IMF is x~1.8+/-0.2. The presence of a probable PMS star population associated to the cluster is weakly revealed.2006MNRAS.367.1441Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/367/1441CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/259 : The Tycho-2 Catalogue (Hog+ 2000)J/other/BASI/32.295 : CCD UBVRI phot. of 3 open clusters (Sujatha+, 2004)J/A+A/417/961 : UBV(RI)c phot. of NGC 2580 & NGC 2588 (Baume+, 2004)J/A+A/445/493 : UBV(RI)c phot. of NGC 2425 & NGC 2635 (Moitinho+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/367/1441https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/367/1441http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/367/1441https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/367/1441https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/367/1441http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/367/1441GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/367/1441/table1 (Photometric catalogue of the NGC 2401 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/367/1441/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/367/1441/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/367/1441/table1?GETtext/xml+votable180.050000true112.331667-14.010750.0055555555555555566/215528.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/367/1441?format=asciiOpticalInfrareddefaultJ/MNRAS/367/1441/table1Photometric catalogue of the NGC 2401 regionDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag? Johnson V magnitudemagphot.mag;em.opt.VfloatnullableB-V? Johnson B-V color indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-Vmagstat.error;phot.color;em.opt.Bfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableSeqIdentification number (this work)meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position in arcseconds from the center (1)arcsecpos.cartesian.x;instr.detfloatYposY position in arcseconds from the center (1)arcsecpos.cartesian.y;instr.detfloatRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainU-B? Johnson U-B color indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? Error in U-Bmagstat.error;phot.color;em.opt.UfloatnullableV-Rc? Johnson-Cousins V-Rc color indexmagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-Rc? Error in V-Rcmagstat.error;phot.color;em.opt.VfloatnullableV-Ic? Johnson-Cousins V-Ic color indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? Error in V-Icmagstat.error;phot.color;em.opt.VfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Error in Kmagmagstat.error;phot.mag;em.IR.KfloatnullableJ-K? 2MASS J-K color indexmagphot.color;em.IR.J;em.IR.Kfloatnullablee_J-K? Error in J-Kmagstat.error;phot.color;em.IR.JfloatnullableH-K? 2MASS H-K color indexmagphot.color;em.IR.H;em.IR.Kfloatnullablee_H-K? Error in H-Kmagstat.error;phot.color;em.IR.HfloatnullablezoneZone where star is located (2)obs.fieldcharMembMembership assignment (3)meta.code.memberchar