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Structures in surface-brightness profiles of LMC and SMC star clusters : evidence of mergers?

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Structures in surface-brightness profiles of LMC and SMC star clusters : evidence of mergers?

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Título Structures in surface-brightness profiles of LMC and SMC star clusters : evidence of mergers?
Autor Carvalho, Luziane Oliveira
Saurin, Tiago Abreu
Bica, Eduardo Luiz Damiani
Bonatto, Charles Jose
Schmidt, Alex Andre
Abstract Context. The LMC and SMC are rich in binary star clusters, and some mergers are expected. It is thus important to characterise single clusters, binary clusters and candidates for mergers. Aims. We selected a sample of star clusters in each Cloud with this aim. Surface photometry of 25 SMC and 22 LMC star clusters was carried with the ESO Danish 1.54 m telescope. 23 clusters were observed for the first time for these purposes. Methods. We fitted Elson, Fall and Freeman (EFF) profiles to the data, deriving structural parameters, luminosities and masses. We also use isophotal maps to constrain candidates for cluster interactions. Results. The structural parameters, luminosities and masses presented good agreement with those in the literature. Three binary clusters in the sample have a double profile. Four clusters (NGC376, K50, K54 and NGC1810) do not have companions and present important deviations from EFF profiles. Conclusions. The present sample contains blue and red Magellanic clusters. Profiles with excess with respect to EFF were detected in some blue clusters. We find evidence that important deviations from the body of EFF profiles might be used as a tool to detect cluster mergers.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 485, no. 1 (Jul. 2008), p. 71-80
Assunto Aglomerados estelares
Brilho
Galaxias
Nuvens de magalhaes
[en] Galaxies: Magellanic Clouds
[en] Galaxies: star clusters
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108030
Arquivos Descrição Formato
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