Hubble Space Telescope observations of M31 associations
Hubble Space Telescope observations of M31 associations
复制标题
哈勃太空望远镜对 M31 协会的观测
DOI：
10.1093/mnras/292.3.490
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Paradijs
中科院分区：
文献类型：
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作者：
E. Magnier;P. Hodge;P. Battinelli;W. Lewin;J. Paradijs
我们利用hstwfpc -2对M31东部旋臂区域的五个场的观测来研究恒星群。我们使用恒星模型的拟合来确定这些领域中OB协会中的恒星的消光。每个集群内的消光范围是我们确定每个关联的准确参数的能力的主要约束。我们能够将集群的年龄确定为对数年龄的~ 0.2，这足以区分较老和较年轻的关联。这些观测为我们提供了对M31中年轻恒星云年龄的第一次测量，并使我们能够与其他校准较差的关联年龄示踪剂进行比较，特别是Ha和Himorphologies。
We have usedHSTWFPC-2 observations of five fields along the eastern spiral arm regions of M31 to study the stellar populations. We use fits to stellar models to determine extinction individually for the stars in OB associations in these fields. The range of extinction within each cluster is the major constraint on our ability to determine accurate parameters for each association. We are able to determine ages of the clusters to ∼0.2 in log age, which is sufficient to distinguish between the older and younger associations. These observations provide us with the first measurement of the ages of young star clouds in M31 and allow us to make comparisons with other, less well-calibrated tracers of the association ages, in particular the Ha and Himorphologies.