J/ApJS/166/549ivo://CDS.VizieR/J/ApJS/166/549doi:10.26093/cds/vizier.21660549CDSGouliermis D.A.Dolphin A.E.Brandner W.Henning T.2007-04-17T11:16:00Z2007-04-17T10:03:09ZCDS support team

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

cds-question@unistra.fropen-star-clustersmagellanic-cloudsinfrared-photometryvisible-astronomyphotometryWe present a photometric study of the star-forming region NGC 346 and its surrounding field in the Small Magellanic Cloud, using data taken with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). The data set contains both short and long exposures for increased dynamic range, and photometry was performed using the ACS module of the stellar photometry package DOLPHOT. We detected almost 100,000 stars over a magnitude range of V~11 to V~28 mag, including all stellar types from the most massive young stars to faint lower main-sequence and pre-main-sequence stars. We find that this region, which is characterized by a plethora of stellar systems and interesting objects, is an outstanding example of mixed stellar populations. We take into account different features of the color-magnitude diagram of all the detected stars to distinguish the two dominant stellar systems: the stellar association NGC 346 and the old spherical star cluster BS 90. These observations provide a complete stellar sample of a field about 5'x5' around the most active star-forming region in this galaxy. Considering the importance of these data for various investigations in the area, we provide the full stellar catalog from our photometry. This paper is the first part of an ongoing study to investigate in detail the two dominant stellar systems in the area and their surrounding field.2006ApJS..166..549Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/166/549CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/PASP/98/1133 : The open cluster NGC 346 (Niemela+, 1986)J/AJ/98/1305 : Stellar content of NGC 346 (Massey+, 1989)J/A+A/405/111 : LMC Survey of Young Stellar Systems (Gouliermis+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/166/549https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/166/549http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/166/549https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/166/549https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/166/549http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/166/549GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/166/549/table2 (Photometric catalog of stars observed with HST/ACS in the region of NGC 346)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/166/549/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/166/549/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/166/549/table2?GETtext/xml+votable180.050000true14.67675-72.161950.005555555555555556HST6/33317 33328https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/166/549?format=asciiOpticalInfrareddefaultJ/ApJS/166/549/table2Photometric catalog of stars observed with HST/ACS in the region of NGC 346recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumStar numbermeta.idintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainindexedVmagThe V band (Vega) magnitude (F555W)magphot.mag;em.opt.Vfloate_VmagThe 1{sigma} error in Vmagmagstat.error;phot.mag;em.opt.VfloatImagThe I band (Vega) magnitude (F814W)magphot.mag;em.opt.Ifloate_ImagThe 1{sigma} error in Imagmagstat.error;phot.mag;em.opt.Ifloat