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Astrophysical properties of binary star clusters in the Small Magellanic Cloud†

Published online by Cambridge University Press:  18 January 2010

João F. C. Santos Jr. ,
Alex A. Schmidt  and
Eduardo Bica
João F. C. Santos Jr.
Affiliation:
Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte 31270-901, MG, Brazil email: [email protected]
Alex A. Schmidt
Affiliation:
Departamento de Matemática, Universidade Federal de Santa Maria, Av. Roraima 1000, Santa Maria 97105-900, RS, Brazil
Eduardo Bica
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre 91501-970, RS, Brazil
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Abstract

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To study the evolution of binary star clusters, we have imaged seven systems in the Small Magellanic Cloud with the SOAR 4m telescope using B and V filters. The sample contains pairs with well-separated components (d < 30 pc) as well as systems that apparently have merged, as evidenced by their unusual structures. By employing isochrone fitting to their color–magnitude diagrams, we have determined reddening values, ages and metallicities, and by fitting King models to their radial stellar-density profiles we estimated core radii. Disturbances of the density profiles are interpreted as evidence of interactions. Properties such as the distances between their components and their age differences are addressed in terms of the timescales involved, to assess the physical connection of the system. In two cases, the age difference is more than 50 Myr, which suggests a chance alignment, capture or sequential star formation.

Keywords

Magellanic Cloudsgalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 533 - 536
Copyright
Copyright © International Astronomical Union 2010

References

Bhatia, R. K. 1990, PASJ, 42, 757Google Scholar
Bhatia, R. K. & Hatzidimitriou, D. 1988, A&A, 230, 215Google Scholar
Bhatia, R. H., Read, M. A., Tritton, S., & Hatzidimitriou, D. 1991, A&AS, 87, 335Google Scholar
Bica, E., Bonatto, C., Dutra, C. M., & Santos, J. F. C. Jr. 2008, MNRAS, 389, 678CrossRefGoogle Scholar
Carvalho, L., Saurin, T. A., Bica, E., Bonatto, C., & Schmidt, A. A. 2008, A&A, 485, 71Google Scholar
Chiosi, E., Vallenari, A., Held, E. V., Rizzi, L., & Moretti, A. 2006, A&A, 452, 179Google Scholar
de Oliveira, M. R., Dutra, C. M., Bica, E., & Dottori, H. 2000, A&AS, 146, 57Google Scholar
Dieball, A., Müller, H., & Grebel, E. K. 2002, A&A, 391, 547Google Scholar
Diolaiti, E., Bendinelli, O., Bonaccini, D., Close, L., Currie, D., & Parmeggiani, G. 2000, A&AS, 147, 335Google Scholar
Girardi, L., Bertelli, G., Bressan, A., Chiosi, C., Groenewegen, M. A. T., Marigo, P., Salasnich, B., & Weiss, A. 2002, A&A, 391, 195Google Scholar
King, I. 1966, AJ, 71, 64CrossRefGoogle Scholar
Mackey, A. D., Broby Nielsen, P., Ferguson, A. M. N., & Richardson, J. C. 2008, ApJ (Letters), 681, L17CrossRefGoogle Scholar
Mackey, A. D. & Gilmore, G. F. 2003, MNRAS, 338, 120CrossRefGoogle Scholar
Matteucci, A., Ripepi, V., Brocato, E., & Castellani, V. 2002, A&A, 387, 861Google Scholar
Piatti, A. E., Sarajedini, A., Geisler, D., Clark, D., & Seguel, J. 2007, MNRAS, 377, 300CrossRefGoogle Scholar
Pietrzyński, G. & Udalski, A. 1999, AcA, 49, 157Google Scholar
Sugimoto, D. & Makino, J. 1989, PASJ, 41, 1117Google Scholar
Vallenari, A., Bettoni, D., & Chiosi, C. 1998, A&A, 331, 506Google Scholar