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New Galactic star clusters discovered in the VVV survey

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New Galactic star clusters discovered in the VVV survey

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Título New Galactic star clusters discovered in the VVV survey
Autor Borissova, Jura
Bonatto, Charles Jose
Kurtev, Radostin Georgiev
Clarke, J. R. A.
Peñaloza, Francisco
Sale, Stuart E.
Minniti, Dante
Alonso Garcia, Javier
Artigau, Étienne
Barbá, Rodolfo H.
Bica, Eduardo Luiz Damiani
Baume, Gustavo Luis
Catelan, Márcio
Chené, André-Nicolas
Dias, Bruno Moreira de Souza
Folkes, S. L.
Froebrich, Dirk
Geisler, Doug
Grijs, Richard de
Hanson, M. M.
Hempel, Maren
Ivanov, Valentin D.
Kumar, M. S. N.
Lucas, Philip W.
Mauro, Francesco
Moni Bidin, Christian
Rejkuba, Marina
Saito, Roberto K.
Tamura, Motohide
Toledo, Ignacio
Abstract Context. VISTA Variables in the Vía Láctea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent section of the disk, where star formation activity is high. One of the principal goals of the VVV Survey is to find new star clusters of different ages. Aims. In order to trace the early epochs of star cluster formation we concentrated our search in the directions to those of known star formation regions, masers, radio, and infrared sources. Methods. The disk area covered by VVV was visually inspected using the pipeline processed and calibrated KS-band tile images for stellar overdensities. Subsequently, we examined the composite JHKS and ZJKS color images of each candidate. PSF photometry of 15 × 15 arcmin fields centered on the candidates was then performed on the Cambridge Astronomy Survey Unit reduced images. After statistical field-star decontamination, color–magnitude and color–color diagrams were constructed and analyzed. Results. We report the discovery of 96 new infrared open clusters and stellar groups. Most of the new cluster candidates are faint and compact (with small angular sizes), highly reddened, and younger than 5 Myr. For relatively well populated cluster candidates we derived their fundamental parameters such as reddening, distance, and age by fitting the solar-metallicity Padova isochrones to the color–magnitude diagrams.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 532 (Aug. 2011), A131, 12 p.
Assunto Aglomerados estelares
Formacao de estrelas
Fotometria estelar
Galaxia
Masers astronômicos
[en] Infrared: general
[en] Open clusters and associations: general
[en] Stars: early-type
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/99317
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