根据星团和恒星光度学解析的NGC 5471亿年恒星形成历史
The 100 Myr Star Formation History of NGC 5471 from Cluster and Resolved Stellar Photometry
摘要：
我们表明，在巨大的HII区域NGC 5471的恒星形成一直在进行中，在过去的1亿年。利用HST/WFPC 2 F547 M和F675 W、地基JHK和GALEX的FUV和NUV图像，我们对M101中巨大的河外HII区NGC 5471的恒星形成历史进行了光度学研究。我们进行光度学研究的颜色星等图（CMD）的解决的恒星，和综合分析的主要个别恒星形成的集群和NGC 5471作为一个整体。整个区域的综合紫外-光学-近红外测光提供了两个不同的参考年龄，800万年和6000万年，揭示了一个复杂的恒星形成的历史，明确证实了CMD解决恒星测光分析。恒星的空间分布表明，NGC 5471的恒星形成至少在过去的1亿年中沿着整个区域进行。目前的电离星团被封闭在一个大气泡内，这很可能是由在2000万年前的一次重大事件中形成的恒星产生的。
英文摘要：
We show that star formation in the giant HII region NGC 5471 has been ongoing during the past 100 Myr. Using HST/WFPC2 F547M and F675W, ground based JHKs, and GALEX FUV and NUV images, we have conducted a photometric study of the star formation history in the massive giant extragalactic HII region NGC 5471 in M101. We perform a photometric study of the colour-magnitude diagram (CMD) of the resolved stars, and an integrated analysis of the main individual star forming clusters and of NGC 5471 as a whole. The integrated UV-optical-nIR photometry for the whole region provides two different reference ages, 8 Myr and 60 Myr, revealing a complex star formation history, clearly confirmed by the CMD resolved stellar photometry analysis. The spatial distribution of the stars shows that the star formation in NGC 5471 has proceeded along the whole region during, at least, the last 100 Myr. The current ionizing clusters are enclosed within a large bubble, which is likely to have been produced by the stars that formed in a major event < 20 Myr ago.
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