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dc.contributor.authorChené, André-Nicolaspt_BR
dc.contributor.authorBorissova, Jurapt_BR
dc.contributor.authorClarke, J. R. A.pt_BR
dc.contributor.authorBonatto, Charles Josept_BR
dc.contributor.authorMajaess, Daniel J.pt_BR
dc.contributor.authorMoni Bidin, Christianpt_BR
dc.contributor.authorSale, Stuart E.pt_BR
dc.contributor.authorMauro, Francescopt_BR
dc.contributor.authorKurtev, Radostin Georgievpt_BR
dc.contributor.authorBaume, Gustavo Luispt_BR
dc.contributor.authorFeinstein Baigorri, Carlospt_BR
dc.contributor.authorIvanov, Valentin D.pt_BR
dc.contributor.authorGeisler, Dougpt_BR
dc.contributor.authorCatelan, Márciopt_BR
dc.contributor.authorMinniti, Dantept_BR
dc.contributor.authorLucas, Philip W.pt_BR
dc.contributor.authorGrijs, Richard dept_BR
dc.contributor.authorKumar, M. S. N.pt_BR
dc.date.accessioned2014-08-05T02:07:37Zpt_BR
dc.date.issued2012pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/99093pt_BR
dc.description.abstractContext. The ESO Public Survey “VISTA Variables in the Vía Láctea” (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide–field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J − H)/E(H − Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Les Ulis. Vol. 545 (Sep. 2012), A54, 18 p.pt_BR
dc.rightsOpen Accessen
dc.subjectOpen clusters and associations: generalen
dc.subjectAglomerados estelarespt_BR
dc.subjectEstrelas variaveispt_BR
dc.subjectInfrared: starsen
dc.subjectSurveysen
dc.subjectFotometria estelarpt_BR
dc.subjectEvolucao estelarpt_BR
dc.subjectEspectros infravermelhospt_BR
dc.subjectGalaxiapt_BR
dc.subjectAstronomia infravermelhapt_BR
dc.titleMassive open star clusters using the VVV survey : I. Presentation of the data and description of the approachpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000901295pt_BR
dc.type.originEstrangeiropt_BR


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