J/A+A/591/A11ivo://CDS.VizieR/J/A+A/591/A11doi:10.26093/cds/vizier.35910011CDSDias B.Kerber L.Barbuy B.Bica E.Ortolani S.2018-01-08T06:37:42Z2016-06-03T07:56:51ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsopen-star-clustersglobular-star-clustersccd-photometryvisible-astronomybroad-band-photometryThe evolution and structure of the Magellanic Clouds is currently under debate. The classical scenario in which both the Large and Small Magellanic Clouds (LMC, SMC) are orbiting the Milky Way has been challenged by an alternative in which the LMC and SMC are in their first close passage to our Galaxy. The clouds are close enough to us to allow spatially resolved observation of their stars, and detailed studies of stellar populations in the galaxies are expected to be able to constrain the proposed scenarios. In particular, the west halo (WH) of the SMC was recently characterized with radial trends in age and metallicity that indicate tidal disruption. We intend to increase the sample of star clusters in the west halo of the SMC with homogeneous age, metallicity, and distance derivations to allow a better determination of age and metallicity gradients in this region. Distances and positions are compared with the orbital plane of the SMC depending on the scenario adopted. Comparisons of observed and synthetic V(B-V) colour-magnitude diagrams were used to derive age, metallicity, distance, and reddening for star clusters in the SMC west halo. Observations were carried out using the 4.1m SOAR telescope. Photometric completeness was determined through artificial star tests, and the members were selected by statistical comparison with a control field. We derived an age of 1.23+/-0.07Gyr and [Fe/H]=-0.87+/-0.07 for the reference cluster NGC 152, compatible with literature parameters. Age and metallicity gradients are confirmed in the WH: 2.6+/-0.6Gyr/{deg} and -0.19+/-0.09dex/{deg}, respectively. The age-metallicity relation for the WH has a low dispersion in metallicity and is compatible with a burst model of chemical enrichment. All WH clusters seem to follow the same stellar distribution predicted by dynamical models, with the exception of AM-3, which should belong to the counter-bridge. Bruck 6 is the youngest cluster in our sample. It is only 130+/-40Myr old and may have been formed during the tidal interaction of SMC-LMC that created the WH and the Magellanic bridge. We suggest that it is crucial to split the SMC cluster population into groups: main body, wing and bridge, counter-bridge, and WH. This is the way to analyse the complex star formation and dynamical history of our neighbour. In particular, we show that the WH has clear age and metallicity gradients and an age-metallicity relation that is also compatible with the dynamical model that claims a tidal influence of the LMC on the SMC.2016A&A...591A..11Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/591/A11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/389/678 : Magellanic Clouds catalogue of extended objects (Bica+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/591/A11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/591/A11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/591/A11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/591/A11https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/591/A11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/591/A11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/591/A11/ngc152 (Star coordinates, magnitudes for NGC 152)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/ngc152?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/ngc152?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/ngc152?GETtext/xml+votable180.050000true8.35125-73.1594440.005555555555555556Cone search capability for table J/A+A/591/A11/hw6 (Star coordinates, magnitudes for HW 6)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/hw6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/hw6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/hw6?GETtext/xml+votable180.050000true8.239167-72.6950.005555555555555556Cone search capability for table J/A+A/591/A11/kron11 (Star coordinates, magnitudes for Kron 8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/kron11?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/kron11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/kron11?GETtext/xml+votable180.050000true9.085417-72.5203060.005555555555555556Cone search capability for table J/A+A/591/A11/kron8 (Star coordinates, magnitudes for Kron 11)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/kron8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/kron8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/kron8?GETtext/xml+votable180.050000true7.13125-73.3474440.005555555555555556Cone search capability for table J/A+A/591/A11/table2 (*Observation log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/table2?GETtext/xml+votable180.050000true4.825-74.574440.005555555555555556Cone search capability for table J/A+A/591/A11/bruck2 (Star coordinates, magnitudes for Bruck 2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/bruck2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/bruck2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/bruck2?GETtext/xml+votable180.050000true4.78-74.6177780.005555555555555556Cone search capability for table J/A+A/591/A11/bruck4 (Star coordinates, magnitudes for Bruck 4)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/bruck4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/bruck4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/bruck4?GETtext/xml+votable180.050000true6.28625-73.0739170.005555555555555556Cone search capability for table J/A+A/591/A11/bruck6 (Star coordinates, magnitudes for Bruck 6)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/bruck6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/bruck6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/bruck6?GETtext/xml+votable180.050000true7.12625-74.4439720.005555555555555556Cone search capability for table J/A+A/591/A11/lind14 (Star coordinates, magnitudes for Lindsay 14)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/lind14?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/lind14?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/lind14?GETtext/xml+votable180.050000true8.292917-72.6247220.005555555555555556Cone search capability for table J/A+A/591/A11/hw5 (Star coordinates, magnitudes for HW 5)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/591/A11/hw5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/591/A11/hw5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/591/A11/hw5?GETtext/xml+votable180.050000true7.962917-72.3863890.0055555555555555566/33291 33313 33315-33316 33318 33324https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/591/A11?format=asciiOpticaldefaultJ/A+A/591/A11/ngc152Star coordinates, magnitudes for NGC 152recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/hw6Star coordinates, magnitudes for HW 6VmagV magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.Bfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/kron11Star coordinates, magnitudes for Kron 8e_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.VfloatJ/A+A/591/A11/kron8Star coordinates, magnitudes for Kron 11recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/table2*Observation logNameCluster namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainDDiameter (1)arcminphys.angSizefloatObs.dateObservation datetime.epoch;obsnullableB[B] Filterinstr.bandpasscharExpTimeBExposure time in B bandstime.duration;obs.exposure;em.opt.BcharAirMassBAirmass in B bandobs.airMassfloatSeeingBSeeing in B bandarcsecinstr.obsty.seeingfloatV[V] Filterinstr.bandpasscharExpTimeVExposure time in V bandstime.duration;obs.exposure;em.opt.VcharAirMassVAirmass in V bandobs.airMassfloatSeeingVSeeing in V bandarcsecinstr.obsty.seeingfloatFileNameName of the table with BV photometrymeta.id;phot;meta.tablecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/591/A11/bruck2Star coordinates, magnitudes for Bruck 2BmagB magnitudemagphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.maine_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/bruck4Star coordinates, magnitudes for Bruck 4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/bruck6Star coordinates, magnitudes for Bruck 6BmagB magnitudemagphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.maine_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/lind14Star coordinates, magnitudes for Lindsay 14recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.VfloatJ/A+A/591/A11/hw5Star coordinates, magnitudes for HW 5recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_BmagB magnitude errormagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagV magnitude errormagstat.error;phot.mag;em.opt.Vfloat