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arXiv 0909.4712astro-ph.SRastro-ph.GA
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小麦哲伦星云双星团的天体物理性质

Astrophysical properties of binary star clusters in the Small Magellanic Cloud

J. F. C. Santos, A. A. Schmidt, E. Bica

摘要:

为了研究双星团的演化,我们用SOAR 4-m望远镜用B和V滤光片对小麦哲伦星云中的7个系统进行了成像。样品中含有分离良好的组分对(d < 30 pc),以及明显合并的系统,如其不寻常的结构所证明的那样。通过采用等时线拟合他们的CMD,我们已经确定了红化,年龄和金属丰度和拟合国王模型的径向恒星密度分布,我们估计核心半径。密度分布的扰动被解释为相互作用的证据。作为组件之间的距离和他们的年龄差异的情况下,涉及到访问系统的物理连接的时间尺度来解决。在两个例子中,年龄差异超过5000万年,这表明偶然的对齐,捕获或连续的恒星形成。

英文摘要:

To study the evolution of binary star clusters we have imaged 7 systems in the Small Magellanic Cloud with SOAR 4-m telescope using B and V filters. 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 stellar 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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