›› 2016, Vol. 1 ›› Issue (12): 26-29.

• 物理学 • 上一篇    下一篇

球状星团Hodge11、NGC1466、NGC2257的颜色-星等图研究

  

  1. (大理大学天文与科技史研究所,云南大理671003)
  • 收稿日期:2016-09-14 修回日期:2016-11-01 出版日期:2016-12-15 发布日期:2016-12-15
  • 作者简介:罗起苹,2010级电子信息科学与技术专业本科生.
  • 基金资助:

    国家自然科学基金资助项目(11563002);中德科学基金资助项目(GZ1284);云南省应用基础研究计划项目
    (2016FB010)

A Study of the Color-magnitude Diagrams of Globular Clusters Hodge11, NGC1466, NGC2257

  1. (Institute for Astronomy and History of Science and Technology, Dali University, Dali, Yunnan 671003, China)
  • Received:2016-09-14 Revised:2016-11-01 Online:2016-12-15 Published:2016-12-15

摘要:

使用新型星族合成方法对哈勃太空望远镜在大麦哲伦云中观测到的球状星团Hodge11、NGC1466、NGC2257进行颜色-
星等图研究。在不考虑观测误差的前提下,通过拟合确定出这3个星团的距离模数、色余、金属丰度、年龄、星暴次数、双星比
例、恒星形成历史等参数。结果表明,这3个星团有着共同的特征:属于年老星团、平均年龄在14 Gyr以上,金属丰度都为
0.000 3,都是由单次星暴产生的简单星族,几个星团均含60%左右的双星。我们发现,使用新型星族合成方法比传统星族合成
方法对观测结果的拟合明显更好。

关键词: 球状星团, 颜色-星等图, 星族合成, 双星, 参数

Abstract:

Advanced stellar population synthesis(ASPS)was used to study the color- magnitude diagrams of globular clusters
Hodge11, NGC1466, and NGC2257, which were observed by the Hubble Space Telescope(HST)in the Large Magellanic Cloud.
Without the consideration of errors in the observation, the distance modulus, color excess, metallicity, age, star burst number, binary
fraction, and star formation history of clusters were determined through fitting. The result shows that the three star clusters are old(with
average age of more than 14 Gyr), and of a metallicity Z of 0.000 3. All of them are shown to be like single stellar populations and have
about 60 percent binaries. It is shown that ASPS fits to the observations better than traditional models.

Key words: globular clusters, color-magnitude diagram, stellar population synthesis, binary star, parameters

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