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Probing the Large Magellanic Cloud age gap at intermediate cluster masses

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Probing the Large Magellanic Cloud age gap at intermediate cluster masses

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Título Probing the Large Magellanic Cloud age gap at intermediate cluster masses
Autor Balbinot, Eduardo
Santiago, Basilio Xavier
Kerber, Leandro de Oliveira
Barbuy, Beatriz
Dias, Bruno Moreira de Souza
Abstract The Large Magellanic Cloud (LMC) has a rich star cluster system spanning a wide range of ages and masses. One striking feature of the LMC cluster system is the existence of an age gap between 3 and 10 Gyr. But this feature is not clearly seen among field stars. Three LMC fields containing relatively poor and sparse clusters whose integrated colours are consistent with those of intermediate-age simple stellar populations have been imaged in BVI with the Optical Imager (SOI) at the Southern Telescope for Astrophysical Research (SOAR). A total of six clusters, five of them with estimated initial massesM <10 4Mʘ, were studied in these fields. Photometry was performed and colour–magnitude diagrams (CMDs) were built using standard point spread function fitting methods. The faintest stars measured reach V ~ 23. The CMD was cleaned from field contamination by making use of the three-dimensional colour and magnitude space available in order to select stars in excess relative to the field. A statistical CMD comparison method was developed for this purpose. The subtraction method has proven to be successful, yielding cleaned CMDs consistent with a simple stellar population. The intermediate-age candidates were found to be the oldest in our sample, with ages between 1 and 2 Gyr. The remaining clusters found in the SOAR/SOI have ages ranging from 100 to 200 Myr. Our analysis has conclusively shown that none of the relatively low-mass clusters studied by us belongs to the LMC age gap.
Contido em Monthly notices of the royal astronomical society. Oxford. Vol. 404, no. 3 (May 2010), p. 1625-1632
Assunto Aglomerados estelares
Formacao de estrelas
Fotometria astronômica
Nuvens de magalhaes
[en] Galaxies: star clusters
[en] Galaxies: stellar content
[en] Magellanic clouds
[en] Stars: statistics
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/90459
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