Betelgeuse Fainter in the Submillimeter Too: An Analysis of JCMT and APEX Monitoring during the Recent Optical Minimum
Betelgeuse Fainter in the Submillimeter Too: An Analysis of JCMT and APEX Monitoring during the Recent Optical Minimum
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DOI：
10.3847/2041-8213/ab9ca6
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发表时间：
2020-07-01
影响因子：
7.9
通讯作者：
Zijlstra, Albert
中科院分区：
文献类型：
--
作者：
Dharmawardena, Thavisha E.;Mairs, Steve;Zijlstra, Albert
参宿四是距离地球最近的红超巨星星星，在其最近的脉动周期中，在光学波长处经历了一个异常深的最小值。我们介绍了詹姆斯克拉克麦克斯韦望远镜和阿塔卡马探路者实验在13年的时间跨度，包括光学调光的亚毫米观测。我们发现，参宿四也调暗了类似的20%，在这些较长的波长在这个光学最低。使用辐射传输模型，我们表明，这可能是由于在光球（光度）的星星，而不是周围的尘埃，如以前在文献中提出的变化。
Betelgeuse, the nearest red supergiant star to Earth, underwent an unusually deep minimum at optical wavelengths during its most recent pulsation cycle. We present submillimeter observations taken by the James Clerk Maxwell Telescope and Atacama Pathfinder Experiment over a time span of 13 yr including the optical dimming. We find that Betelgeuse has also dimmed by similar to 20% at these longer wavelengths during this optical minimum. Using radiative-transfer models, we show that this is likely due to changes in the photosphere (luminosity) of the star as opposed to the surrounding dust, as was previously suggested in the literature.