arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.1742astro-ph.COastro-ph.GA
收藏

基于HST/WFC3早期释放科学观测的M83中的分辨恒星

Resolved Stars in M83 based on HST/WFC3 Early Release Science Observations

Hwihyun Kim, Bradley C. Whitmore, Rogier A. Windhorst

备注：
5 pages, 2 figures; to be published in UP: Have Observations Revealed a Variable Upper End of the Initial Mass Function? Marie Treyer, Ted Wyder, Don Neill, Mark Seibert, and Janice Lee (editors), p. 129 (ASP, in press)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们提出了一个多波长测光研究的基础上采取的观测作为WFC 3早期释放科学（ERS）计划的一部分，个别恒星在M83。利用F336 W、F438 W、F555 W和F814 W四种宽波段滤光片对M83的中心区域进行了UBVI测光色和内禀光度的测量。这些测量被用来确定M83最近（< 1 Gyr）的恒星形成历史。我们选择了50个地区的螺旋臂和臂间区的M83和分类的基础上他们的H？形态学为了确定每个区域恒星的年龄，我们使用了色-星等图（CMD）和色-色图，并使用了金属丰度为Z=0.03（1.5 Z{ \odot }）的帕多瓦等时线。我们使用无红化的Q参数校正了单个恒星的前景和内部消光，并从CMD上的等时线拟合改进了我们对恒星年龄的估计。比较恒星年龄和星团年龄的基础上，他们的H？形态和它们的光谱能量分布（SED）进行了拟合，并显示出相当好的相关性。我们还发现，确定年龄小于10万年的地区位于优先沿活跃的恒星形成区的旋臂。

英文摘要：

We present a multi-wavelength photometric study of individual stars in M83 based on observations taken as part of the WFC3 Early Release Science (ERS) program. The central region of M83 has been imaged in seven broad-band filters to obtain multi-wavelength coverage from the near-UV to near-IR. We use four filters- F336W, F438W, F555W, and F814W-to measure the UBVI photometric colors and intrinsic luminosity for ~10,000 stars. These measurements are used to determine the recent (< 1 Gyr) star formation history of M83. We selected 50 regions in the spiral arm and the inter-arm area of M83 and categorize them based on their H? morphology. To determine ages of stars in each region, the color-magnitude diagrams (CMD) and the color-color diagrams were used with the Padova isochrones with a metallicity of Z=0.03 (1.5 Z{\odot}). We correct the foreground and internal extinction of individual stars using the reddening-free Q parameter and improve our age estimates of stars from the isochrone fitting on the CMDs. Comparisons of stellar ages and cluster ages based on both their H? morphology and their spectral energy distribution (SED) fitting were made and show fairly good correlations. We also find that the regions with ages determined younger than 10 Myr are located preferentially along the active star-forming regions on the spiral arm.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑