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夏普力-索耶集中度分类法

夏普力–索耶集中度分类法(Shapley–Sawyer Concentration Class)是依据球状星团的集中度以罗马数字Ⅰ至ⅩⅡ进行分类的方法。集中度最高的星团,像是M75,分类为Ⅰ;依序逐渐降低集中度至最低的ⅩⅡ,例如帕罗马 12。(有时会以数字1~12来取代罗马数字。)

历史

从1927至1929年,哈洛·夏普力和海伦·索耶·霍格开始依据球状星团系统向中心集中的程度有系统的进行分类的编目工作。这成为今日所熟知的夏普力–索耶集中度分类法[1]

分类

分类 说明 范例
I 高度向中心集中
II 中心密度集中
M2
III 核心的恒星丰富
M54
IV 中等丰度凝聚
M15
V 中等的凝聚
M30
VI 中间的
M3
VII 中间的(Intermediate)
M22
VIII 向中心的集中颇为松散
M14
IX 宽松的趋向中心
M12
X 松散的
M68
XI 朝向中心非常松散
M55
XII 几乎没有朝向中心聚集
帕罗马12

[2]

参考资料

  1. ^ Hogg, Helen Battles Sawyer. Harlow Shapley and Globular Clusters. Publications of the Astronomical Society of the Pacific. October 1965, 77 (458): 336–46. Bibcode:1965PASP...77..336S. JSTOR 40674226. doi:10.1086/128229 –通过JSTOR. 
  2. ^ Burton, Jeff. Shapley–Sawyer Globular Cluster Concentration Class. July 26, 2011. (原始内容存档于2012年3月22日). 
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夏普力-索耶集中度分类法
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