七个SMC中老年星团的结构参数
Structural Parameters of Seven SMC Intermediate-Age and Old Star Clusters
摘要：
本文给出了小麦哲伦星云中7个中老年星团NGC 121、Lindsay 1、Kron 3、NGC 339、NGC 416、Lindsay 38和NGC 419的结构参数。我们适合国王配置文件和埃尔森，秋天，和弗里曼配置文件的表面亮度和恒星计数的数据与先进的相机上的哈勃太空望远镜的调查。年龄大于1 Gyr的星团核心半径随年龄增加而增加，而最年轻的星团核心相对紧凑。没有发现核后坍缩的证据。我们发现核半径和到SMC中心的距离之间没有相关性，尽管与其他矮星系的研究一致，一些相对古老和大质量的星系团具有低密度。最古老的SMC星团，唯一的球状星团NGC 121，是研究的星团中最椭圆的天体。没有相关性之间的椭圆度和距离SMC中心。因此，这些巨大的中间年龄（1-8 Gyr）SMC星团的结构似乎主要是内部进化过程的结果。
英文摘要：
We present structural parameters for the seven intermediate-age and old star clusters NGC121, Lindsay 1, Kron 3, NGC339, NGC416, Lindsay 38, and NGC419 in the Small Magellanic Cloud. We fit King profiles and Elson, Fall, and Freeman profiles to both surface-brightness and star count data taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. Clusters older than 1 Gyr show a spread in cluster core radii that increases with age, while the youngest clusters have relatively compact cores. No evidence for post core collapse clusters was found. We find no correlation between core radius and distance from the SMC center, although consistent with other studies of dwarf galaxies, some relatively old and massive clusters have low densities. The oldest SMC star cluster, the only globular NGC121, is the most elliptical object of the studied clusters. No correlation is seen between ellipticity and distance from the SMC center. The structures of these massive intermediate-age (1-8 Gyr) SMC star clusters thus appear to primarily result from internal evolutionary processes.
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