期刊
ASTRONOMY & ASTROPHYSICS
卷 555, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220567
关键词
stars: Population II; globular clusters: individual: NGC 1844; binaries: general; Magellanic Clouds
资金
- Australian Research Council [DP120100475]
- Universita di Padova [CPDA101477]
- PRIN INAF Formation and Early Evolution of Massive Star Clusters
- PRIN MIUR [prot. 2010LY5N2T]
- IAC [310394]
- Education and Science Ministry of Spain [AYA2007-3E3506, AYA2010-16717]
We used Hubble Space Telescope observations to study the young cluster NGC 1844 in the Large Magellanic Cloud (LMC). We estimated the fraction and the mass-ratio distribution of photometric binaries and report that the main sequence presents an intrinsic breadth which cannot be explained only in terms of photometric errors, and is unlikely because of differential reddening. We attempted different interpretations of this feature, including stellar rotation, binary stars, and the presence of multiple stellar populations of different ages, metallicity, helium, or C+N+O abundance. Although we have excluded age, helium, and C+N+O variations of being responsible for the main-sequence spread, none of the other interpretations is conclusive.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据