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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Clustering of Emission-Line Stars in the W 5 E H II Region
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Clustering of Emission-Line Stars in the W 5 E H II Region

机译：W 5 E H II地区的发射线恒星聚类

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摘要

We have made a new survey of emission-line stars in the W 5 E H II region to investigate the population of PMS stars near the OB stars by using the Wide Field Grisin Spectrograph 2 (WFGS2). A total of 139 H alpha emission stars were detected and their g'i'-photometry was performed. Their spatial distribution shows three aggregates, i.e., two aggregates near the bright-rimmed clouds at the edge of the W 5 E H II region (BRC 13 and BRC 14) and one near the exciting O7 V star. The age and mass of each H alpha star were estimated from an extinction-corrected color-magnitude diagram and theoretical evolutionary tracks. We found, for the first time in this region, that the young stars near the exciting star are systematically older (4 Myr) than those near the edge of the H II region (1 Myr). This result supports that the formation of stars proceeds sequentially from the center of H II region to the eastern bright rim. We further suggest a possibility that the birth of low-mass stars near the exciting star of the H it region precedes the production of massive OB stars in the pre-existing molecular cloud.
机译：我们对W 5 E H II区域的发射线恒星进行了一项新的调查，以使用广域格里辛光谱仪2（WFGS2）调查OB恒星附近的PMS恒星。总共检测到139个H alpha发射星，并执行了它们的g'i'-光度法。它们的空间分布显示出三个聚集体，即W 5 E H II区域（BRC 13和BRC 14）边缘的亮缘云附近的两个聚集体，以及令人兴奋的O7 V星附近的两个聚集体。根据消光校正后的色度图和理论演化轨迹，估算出每颗Hα星的年龄和质量。我们在该区域首次发现，靠近恒星的年轻恒星系统地比位于H II区边缘的年轻恒星（1 Myr）大（4 Myr）。这一结果支持恒星的形成从H II区的中心到东部明亮边缘依次进行。我们进一步提出了这样一种可能性，即低质量恒星在Hit区域令人兴奋的恒星附近诞生之前，先于现有的分子云中产生了大型OB恒星。

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