致密椭圆星系M32中的红外变星
Infrared variable stars in the compact elliptical galaxy M32
摘要：
利用斯皮策空间望远镜在3.6和4.5 $μ$ m处的三个测光历元，以32到381天为间隔，识别了致密椭圆星系M32中的变星。我们提出了一个高保真度的目录中检测到的来源在多个时代在3.6和4.5 $μ$米，我们分析了恒星的变化，使用联合概率误差加权通量差。其中，83颗恒星被确定为候选大振幅，长周期变量，28颗被认为是高置信度变量。大多数的变星被分类为渐近巨星分支恒星候选者使用颜色星等图。我们没有发现任何证据支持在我们的M32区域有一个更年轻的、红外线明亮的恒星星族。
英文摘要：
Variable stars in the compact elliptical galaxy M32 are identified, using three epochs of photometry from the Spitzer Space Telescope at 3.6 and 4.5 $μ$m, separated by 32 to 381 days. We present a high-fidelity catalogue of sources detected in multiple epochs at both 3.6 and 4.5 $μ$m, which we analysed for stellar variability using a joint probability error-weighted flux difference. Of these, 83 stars are identified as candidate large-amplitude, long-period variables, with 28 considered high-confidence variables. The majority of the variable stars are classified as asymptotic giant branch star candidates using colour-magnitude diagrams. We find no evidence supporting a younger, infrared-bright stellar population in our M32 field.
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