The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. I. Photometry
The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. I. Photometry
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哈勃太空望远镜 ACS 观测小麦哲伦星云中的恒星形成区 NGC 346。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
T. Henning
中科院分区：
文献类型：
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作者：
D. Gouliermis;A. Dolphin;W. Brandner;T. Henning
我们提出了一个恒星形成区域NGC 346及其周围领域的小麦哲伦星云的光度研究，使用的数据与先进的相机测量（ACS）上的哈勃太空望远镜（HST）。该数据集包含增加动态范围的短曝光和长曝光，并使用恒星测光包DOLPHOT的ACS模块进行测光。我们探测到了近10万颗恒星，其星等范围从V ~ 11到V ~ 28等，包括从最大质量的年轻恒星到微弱的低主序星和前主序星的所有恒星类型。我们发现，这一地区，其特点是大量的恒星系统和有趣的对象，是一个杰出的例子混合恒星种群。我们考虑到所有检测到的恒星的颜色星等图的不同功能，以区分两个主要的恒星系统：恒星协会NGC 346和旧的球形星星集群BS 90。这些观测提供了一个完整的恒星样本，该样本围绕着该星系中最活跃的恒星形成区域，大约为5′ × 5′。考虑到这些数据的重要性，在该地区的各种调查，我们提供了完整的恒星目录，从我们的测光。本文是正在进行的研究的第一部分，详细调查该地区的两个主要恒星系统及其周围的领域。
We present a photometric study of the star-forming region NGC 346 and its surrounding field in the Small Magellanic Cloud, using data taken with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). The data set contains both short and long exposures for increased dynamic range, and photometry was performed using the ACS module of the stellar photometry package DOLPHOT. We detected almost 100,000 stars over a magnitude range of V ~ 11 to V ~ 28 mag, including all stellar types from the most massive young stars to faint lower main-sequence and pre-main-sequence stars. We find that this region, which is characterized by a plethora of stellar systems and interesting objects, is an outstanding example of mixed stellar populations. We take into account different features of the color-magnitude diagram of all the detected stars to distinguish the two dominant stellar systems: The stellar association NGC 346 and the old spherical star cluster BS 90. These observations provide a complete stellar sample of a field about 5′ × 5′ around the most active star-forming region in this galaxy. Considering the importance of these data for various investigations in the area, we provide the full stellar catalog from our photometry. This paper is the first part of an ongoing study to investigate in detail the two dominant stellar systems in the area and their surrounding field.