J/A+A/531/A73ivo://CDS.VizieR/J/A+A/531/A73doi:10.26093/cds/vizier.35310073CDSBaume G.Carraro G.Comeron F.de Elia G.C.2011-08-07T16:01:35Z2011-06-15T16:38:50ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryThe Ara OB1a association is a nearby complex in the fourth Galactic quadrant where a number of young/embedded star clusters are projected close to more evolved, intermediate age clusters. It is also rich in interstellar matter, and contains evidences of the interplay between massive stars and their surrounding medium, like the rim HII region NGC 6188. We provide more solid estimates of the fundamental parameters (age and distance) of the two most prominent stellar clusters, NGC 6167 and NGC 6193, that may be used as a basis to study the star formation history of the region. The study is based on a photometric optical survey (UBVIHa) of NGC 6167 and NGC 6193 and their nearby field, complemented with public data from 2MASS-VVV, UCAC3 and IRAC-Spitzer in this region. We produced a uniform photometric catalogue and we estimated more robustly the fundamental parameters for NGC 6167, NGC 6193 and the IRAS 16375-4854 source. As a consequence, all of them are located at approximately the same distance from the Sun in the Sagittarius-Carina Galactic arm. However, the ages we estimated differ widely: NGC 6167 results to be an intermediate-age cluster (20-30Myr), NGC 6193 a very young one (1-5Myr) with PMS, H{alpha} emitters, and class II objects; and the IRAS 16375-4854 source is revealed as the youngest of the three containing several YSOs. These results support a picture in which Ara OB1a is a region where star formation has proceeded for several tens of Myr up to the present. The difference in ages of different stellar groups can be interpreted as a consequence of a triggered star formation process. Additionally, in the specific case of NGC 6193, an indication of possible non-coeval star formation was found.2011A&A...531A..73Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/531/A73CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/315 : UCAC3 Catalogue (Zacharias+ 2009)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/531/A73https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/531/A73http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/531/A73https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/531/A73https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/531/A73http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/531/A73GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/531/A73/ngc6167 (Astrometry/photometry of NGC 6167 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/531/A73/ngc6167?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/531/A73/ngc6167?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/531/A73/ngc6167?GETtext/xml+votable180.050000true248.59609583-49.7698750.005555555555555556Cone search capability for table J/A+A/531/A73/ngc6193 (Astrometry/photometry of NGC 6193 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/531/A73/ngc6193?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/531/A73/ngc6193?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/531/A73/ngc6193?GETtext/xml+votable180.050000true250.33506778-48.762938890.0055555555555555566/42190-42191 42208-42209 42212-422132.0616683193919197e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/531/A73?format=asciiOpticalInfrareddefaultJ/A+A/531/A73/ngc6167Astrometry/photometry of NGC 6167 regionB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatnullableHa? H{alpha} index {Delta}H{alpha} [=H{alpha}(on)-H{alpha}(off)]magphot.color;em.opt.V;em.line.Halphafloatnullablee_Ha? rms uncertainty on Hamagstat.errorfloatnullableW(Ha)? Estimated H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphadoublenullablee_W(Ha)? rms uncertainty on W(Ha)0.1nmstat.errorfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullablef.mag? UCAC3 fit magnitude (Cat. I/315)magphot.mag;em.optfloatnullablepmRA? Proper motion along RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? rms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? rms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableRAJ2000Right ascension in decimal degrees (J2000) (observed at Las Campanas Obs. on 25 June 2006 and 24 June 2009)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000) (observed at Las Campanas Obs. on 25 June 2006 and 24 June 2009)degpos.eq.dec;meta.mainindexedJ/A+A/531/A73/ngc6193Astrometry/photometry of NGC 6193 regionSeqSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatnullableHa? H{alpha} index {Delta}H{alpha} [=H{alpha}(on)-H{alpha}(off)]magphot.color;em.opt.V;em.line.Halphafloatnullablee_Ha? rms uncertainty on Hamagstat.errorfloatnullableW(Ha)? Estimated H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphadoublenullablee_W(Ha)? rms uncertainty on W(Ha)0.1nmstat.errorfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullablef.mag? UCAC3 fit magnitude (Cat. I/315)magphot.mag;em.optfloatnullablepmRA? Proper motion along RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? rms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? rms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableRAJ2000Right ascension in decimal degrees (J2000) (observed at Cerro Tololo Obs. on 26 March 2006 and 21 May 2006)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000) (observed at Cerro Tololo Obs. on 26 March 2006 and 21 May 2006)degpos.eq.dec;meta.mainindexed