标题： 小麦哲伦云中10个富星团的表面亮度分布与结构参数 显示英文标题

标题： Surface Brightness Profiles and Structural Parameters for 10 Rich Stellar Clusters in the Small Magellanic Cloud

摘要： 作为我们最近对大麦哲伦云（LMC）星团样本研究的后续工作（astro-ph/0209031），我们利用存档的哈勃太空望远镜快拍数据，对十个小麦哲伦云（SMC）星团的结构进行了类似的研究。 我们为每个星团提供了表面亮度分布，并使用与LMC样本完全相同的方法推导出结构参数，包括核心半径和光度及质量估计。 由于样本量较小，SMC的结果不如LMC样本那么详细。我们没有观测到任何核心坍缩后的星团（尽管我们并未期望观测到），并且我们的样本中几乎没有双星团的证据。 尽管样本量小，但我们首次表明SMC星团几乎完全遵循LMC系统中观测到的核心半径随年龄变化的趋势，包括在几百Myr时出现的明显分支现象。这进一步加强了我们的论点，即这种关系代表了这些星团的真实物理演化，其中一些由于某种尚未确定的物理过程而发展出显著扩展的核心。 为了澄清许多问题，仍需要更多的观测数据和来自N体模拟的数据。 显示英文摘要

摘要： As a follow up to our recent study of a large sample of LMC clusters (astro-ph/0209031), we have conducted a similar study of the structures of ten SMC clusters, using archival Hubble Space Telescope snapshot data. We present surface brightness profiles for each cluster, and derive structural parameters, including core radii and luminosity and mass estimates, using exactly the same procedure as for the LMC sample. Because of the small sample size, the SMC results are not as detailed as for the larger LMC sample. We do not observe any post core-collapse clusters (although we did not expect to), and there is little evidence for any double clusters in our sample. Nonetheless, despite the small sample size, we show for the first time that the SMC clusters follow almost exactly the trend in core radius with age observed for the LMC system, including the apparent bifurcation at several hundred Myr. This further strengthens our argument that this relationship represents true physical evolution in these clusters, with some developing significantly expanded cores due to an as yet unidentified physical process. Additional data, both observational and from N-body simulations, is still required to clarify many issues.