A SPECTROSCOPIC SURVEY OF MASSIVE STARS IN M31 AND M33
A SPECTROSCOPIC SURVEY OF MASSIVE STARS IN M31 AND M33
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DOI：
10.3847/0004-6256/152/3/62
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
P. Massey;K. Neugent;B. Smart
中科院分区：
文献类型：
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作者：
P. Massey;K. Neugent;B. Smart
我们描述了我们对M31和M33的本星系群巡天（LGGS）光度测量的光谱跟踪。我们已经获得了1895颗恒星的新光谱，使我们能够首次对其中的1496颗进行分类。我们的研究已经确定了许多前景恒星，并确定了数百个早期和中型超巨星的成员。我们还发现了9个新的候选亮蓝变量和一颗以前未被发现的沃尔夫-拉叶星。我们重新发布了LGGS M31和M33星表，改进了坐标，包括文献中的光谱学和我们的新结果。本文中的光谱学对这两个邻近的螺旋星系中的绝大多数恒星进行了分类。在我们的样本中，最明亮（因此质量最大）的恒星是早期B型超巨星，正如预期的那样；更大质量的O型恒星在视觉上更加罕见和暗淡，因此到目前为止大多数都没有被观测到。在我们的样本中，大多数未演化的恒星都在20-40 M⊙的范围内。
We describe our spectroscopic follow-up to the Local Group Galaxy Survey (LGGS) photometry of M31 and M33. We have obtained new spectroscopy of 1895 stars, allowing us to classify 1496 of them for the first time. Our study has identified many foreground stars, and established membership for hundreds of early- and mid-type supergiants. We have also found nine new candidate luminous blue variables and a previously unrecognized Wolf–Rayet star. We republish the LGGS M31 and M33 catalogs with improved coordinates, and including spectroscopy from the literature and our new results. The spectroscopy in this paper is responsible for the vast majority of the stellar classifications in these two nearby spiral neighbors. The most luminous (and hence massive) of the stars in our sample are early-type B supergiants, as expected; the more massive O stars are more rare and fainter visually, and thus mostly remain unobserved so far. The majority of the unevolved stars in our sample are in the 20–40 M⊙ range.