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Young Stellar Objects in the Large Magellanic Cloud: N63 and N180 H II Regions

机译:麦哲伦星云中的年轻恒星物体:N63和N180 H II地区

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We used Spitzer infrared observations to find the young stars of two H II regions in the Large Magellanic Cloud, N63 and N180. The young stellar object (YSO) candidates were identified in each nebula by means of color-color, color-magnitude diagrams, and the shapes of their spectral energy distributions (SEDs). The most luminous YSOs are found near the ionization fronts within strong 8 μm emission clumps. Most YSOs, less luminous, are seen in projection inside the H II regions. HST images show several Class I stars that have emerged along the borders of the H II regions; other YSOs are embedded in cometary clouds. The most luminous YSO of N63 is connected to a string of pointlike sources. Its SED can be modeled by a central source of stellar mass M between 7 and 11 M☉, with a circumstellar disk of outer radius Rd of ~55 AU, and an envelope of moderate accretion rate, of ~2 × 10?5 M☉ yr?1. N180 is experiencing a phase of star formation more intense than N63, attested by the properties of its most luminous YSO: M of 25 M☉, Rd of ~200 AU, and of ~1.5 × 10?3 M☉ yr?1. The modes of triggered star formation in N63 and N180 appear similar to those seen in Galactic H II regions.
机译:我们使用Spitzer红外观测在大麦哲伦星云N63和N180中找到了两个H II区的年轻恒星。通过彩色,彩色大小图及其光谱能量分布(SED)的形状,在每个星云中确定了年轻的恒星目标(YSO)候选对象。在8μm强发射团块内的电离前沿附近发现了发光度最高的YSO。在H II区域内的投影中可以看到大多数亮度较低的YSO。 HST图像显示了沿H II地区边界出现的几颗I类恒星;其他YSO嵌入在彗星云中。 N63的最发光的YSO连接到一串点状光源。它的SED可以由7至11 M between的恒星质量M的中心源模拟,外半径Rd约为55 AU的星际盘,并且具有约2×10?5M☉的中等吸积率包络。 1。 N180正在经历比N63更强烈的恒星形成阶段,这是由其最明亮的YSO特性证明的:M为25M☉,Rd为〜200 AU和〜1.5×10?3M☉yr?1。在N63和N180中,触发恒星形成的模式与在银河H II区中看到的模式相似。

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