利用SAGE巡天在大麦云中发现的变星和YSO
Variable Evolved Stars and YSOs Discovered in the Large Magellanic Cloud using the SAGE Survey
摘要：
我们目前的初步结果和源列表中的变量来源的大麦云云（LMC），我们检测热红外变化的SAGE（调查代理人的星系的演变）调查，其中有2个时代的测光分开三个月。SAGE调查使用斯皮策号上的IRAC和MIPS仪器绘制了LMC的7度乘7度区域。使用IRAC 3.6、4.5、5.8、8.0 \micron波段和MIPS 24 \micron波段的组合识别可变源。两个历元之间的误差加权通量差用于评估可变性。在这两个时期探测到的约300万个源中，我们发现了约2,000个可变源，我们提供了电子目录。大多数变星源可以归类为渐近巨星分支（AGB）星。大部分（> 66%）的极端AGB恒星是可变的，只有少量的富碳（6.1%）和富氧（2.0%）恒星被检测为可变的。我们还发现了一个人口的变量年轻恒星对象候选人。
英文摘要：
We present initial results and source lists of variable sources in the Large Magellanic Cloud (LMC) for which we detect thermal infrared variability from the SAGE (Surveying the Agents of a Galaxy's Evolution) survey, which had 2 epochs of photometry separated by three months. The SAGE survey mapped a 7 degree by 7 degree region of the LMC using the IRAC and the MIPS instruments on board Spitzer. Variable sources are identified using a combination of the IRAC 3.6, 4.5, 5.8, 8.0 \micron bands and the MIPS 24 \micron bands. An error-weighted flux difference between the two epochs is used to assess the variability. Of the ~ 3 million sources detected at both epochs we find ~ 2,000 variable sources for which we provide electronic catalogs. Most of the variable sources can be classified as asymptotic giant branch (AGB) stars. A large fraction (> 66%) of the extreme AGB stars are variable and only smaller fractions of carbon-rich (6.1%) and oxygen-rich (2.0%) stars are detected as variable. We also detect a population of variable young stellar object candidates.
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