在小麦哲伦星云的突出的恒星爆发区域中的一个非常年轻的组成部分
A very young component in the pre-eminent starburst region of the Small Magellanic Cloud
摘要：
本文研究了SMC突出星暴区N66/NGC 346中的致密H Ⅱ区N66 A。尽管对N66/NGC 346复合体的各种成分进行了广泛的研究，但迄今为止很少有研究集中在N66 A上，N66 A是整个复合体中的一个特殊对象，因此值得仔细研究。在麦哲伦星云中大质量恒星形成的框架中，对这个紧凑的H II区域及其同伴天体的研究似乎很重要。这项分析主要基于我们的光学ESO NTT观测，包括成像和光谱，以及存档的HST ACS数据和斯皮策红外图像（IRAC 3.6，4.5，5.8和8.0微米）。我们得到了致密H Ⅱ区N66 A的一些物理特性。此外，我们还首次用光谱学方法对N66 A的主激发星进行了光谱分类。它的光谱特征表明它是一颗O 8型的主序星。我们比较了这个结果的基础上恒星莱曼连续通量估计电离气体H-β通量。致密的H II区属于麦哲伦星云中一类罕见的H II区，称为高激发斑点（HEBs）。N66 A很可能代表了N66复合体中一个非常年轻的大质量恒星形成事件，它有一系列的年龄。
英文摘要：
We present a study of the compact H II region N66A in the SMC pre-eminent starburst region N66/NGC346. Despite extensive research on various components of the N66/NGC346 complex, few studies have so far focused on N66A, which is a special object in the whole complex and therefore deserves scrutiny. The study of this compact H II region and its fellow objects seems important in the framework of massive star formation in the Magellanic Clouds. This analysis is based mainly on our optical ESO NTT observations, both imaging and spectroscopy, coupled with archive HST ACS data and Spitzer infrared images (IRAC 3.6, 4.5, 5.8, and 8.0 microns). We derive a number of physical characteristics of the compact H II region N66A. Moreover, we present the spectral classification of the main exciting star of N66A for the first time using spectroscopy. Its spectral features indicate a main sequence massive star of type O8. We compare this result with that based on the stellar Lyman continuum flux estimated from the ionized gas H-beta flux. The compact H II region belongs to a rare class of H II regions in the Magellanic Clouds, called High-excitation Blobs (HEBs). N66A most probably represents a very young massive star formation event in the N66 complex, which has a range of ages.
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