J/A+A/511/A25ivo://CDS.VizieR/J/A+A/511/A25doi:10.26093/cds/vizier.35110025CDSRauw G.Manfroid J.De Becker M.2010-05-04T22:56:26Z2010-03-16T12:54:17ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsinfrared-photometryvisible-astronomyWide-band photometryh-alpha-photometryThe very young open cluster NGC 6383 centered on the O-star binary HD 159176 is an interesting place for studying the impact of early-type stars with strong radiation fields and powerful winds on the formation processes of low-mass stars. To investigate this process, it is necessary to determine the characteristics (age, presence, or absence of circumstellar material) of the population of low-mass pre-main-sequence (PMS) stars in the cluster. We obtained deep U B V Rc Ic H{alpha} photometric data of the entire cluster as well as medium-resolution optical spectroscopy of a subsample of X-ray selected objects. Our spectroscopic data reveal only very weak H{alpha} emission lines in a few X-ray selected PMS candidates. We photometrically identify a number of H-{alpha} emission candidates but their cluster membership is uncertain. We find that the fainter objects in the field of view have a wide range of extinction (up to A_V_=20), one X-ray selected OB star having A_V_~8. Our investigation uncovers a population of PMS stars in NGC 6383 that are probably coeval with HD 159176. In addition, we detect a population of reddened objects that are probably located at different depths within the natal molecular cloud of the cluster. Finally, we identify a rather complex spatial distribution of H{alpha} emitters, which is probably indicative of a severe contamination by foreground and background stars.2010A&A...511A..25Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/511/A25CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/357/345 : Pulsating pre-main-sequence stars in NGC6383 (Zintz+, 2005)J/A+A/462/157 : Stromgren CCD photometry in NGC 6383 (Paunzen+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/511/A25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/511/A25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/511/A25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/511/A25https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/511/A25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/511/A25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/511/A25/table2 (Photometric data of NGC 6383)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/511/A25/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/511/A25/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/511/A25/table2?GETtext/xml+votable180.050000true263.93955806-32.853996940.0055555555555555566/28809 28811-28812https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/511/A25?format=asciiOpticalInfrareddefaultJ/A+A/511/A25/table2Photometric data of NGC 6383recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqInternal number of the sourcemeta.numberintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmagJohnson V-band magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatU-VJohnson U-V colour indexmagphot.color;em.opt.U;em.opt.Vfloate_U-VUncertainty on U-Vmagstat.error;phot.color;em.opt.UfloatB-VJohnson B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-VUncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatV-RcJohnson-Cousins V-Rc colour indexmagphot.color;em.opt.V;em.opt.Rfloate_V-RcUncertainty on V-Rcmagstat.error;phot.color;em.opt.VfloatV-IcJohnson-Cousins V-Ic colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-IcUncertainty on V-Icmagstat.error;phot.color;em.opt.VfloatRc-HaRc-H{alpha} indexmagphot.color;em.opt.V;em.line.Halphafloate_Rc-HaUncertainty on the Rc-H{alpha} indexmagstat.error;phot.color;em.opt.Rfloat