| Apresentação/Painel: | |
| Autor: | João Francisco C. Santos Jr.1 |
| Alex A. Schmidt2 | |
| Eduardo Bica3 | |
| Instituição: | 1UFMG - Belo Horizonte |
| 2UFSM - Santa Maria /font> | |
| 3UFRGS - Porto Alegre | |
| Formato: | Painel |
| Título: | Photometry of binary star clusters in the Small Magellanic Cloud |
| Resumo: | Out of ~1200 star clusters catalogued in the SMC, ~150 belong to groupings. The physical nature of these groupings was investigated for selected objects using the SOAR Optical Imager. Fundamental astrophysical properties and structural characteristics were determined by employing the BV calibrated photometry of seven SMC fields including physical binary cluster candidates and merger candidates. To reach a conclusion about the nature of each object, analyses of colour-magnitude diagrams, radial density profiles and stellar density maps were accomplished. The sample contains pairs with well-separated components (d < 30 pc) as well as systems that apparently merged, as evidenced by their unusual structures. By employing isochrone fittings to their CMDs we have determined reddening, age and metallicity and by fitting King models to their radial density profile we have estimated core radius. Disturbances of the density profile are interpreted as an evidence of interaction. Circunstances as distances between components and their age difference are addressed in terms of the timescales involved to access the physical connection of the system. In two cases the age difference is above 50 Myr, which suggests chance alignment, capture or sequential star formation. |
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