快速爆发的恒星GM Cep：Tr 37的EX-OR？
The Rapid Outbursting Star GM Cep: An EX-or in Tr 37?
摘要：
我们目前的光学，红外和毫米观测的太阳型恒星13-277，也被称为GM Cep，在400万年前的集群Tr 37。GM Cep在光波长处经历了超过2 mag的快速星等变化。我们探讨的变化，这似乎是由强大的增长在吸积，类似于EX-或事件的原因。这颗恒星表现出很高的、可变的吸积率（高达~10 $^{-6}$ Msun/yr），这是强风的迹象，它是一个非常快的自转体（Vsini~43 km/s）。它强烈的中红外过度揭示了一个非常张开的磁盘和/或残余信封，最有可能的流体静力平衡。1.3毫米的通量表明一个相对巨大的圆盘（Mdisk~0.1 Msun）。然而，毫米质量不足以维持增加的吸积情节在大的时间尺度，除非质量被低估，由于显着的晶粒生长。最后，我们探讨了GM Cep有一个双伴星的可能性，这可能会触发磁盘不稳定性产生增强的吸积情节。
英文摘要：
We present optical, IR and millimeter observations of the solar-type star 13-277, also known as GM Cep, in the 4 Myr-old cluster Tr 37. GM Cep experiences rapid magnitude variations of more than 2 mag at optical wavelengths. We explore the causes of the variability, which seem to be dominated by strong increases in the accretion, being similar to EX-or episodes. The star shows high, variable accretion rates (up to ~10$^{-6}$ Msun/yr), signs of powerful winds, and it is a very fast rotator (Vsini~43 km/s). Its strong mid-IR excesses reveal a very flared disk and/or a remnant envelope, most likely out of hydrostatic equilibrium. The 1.3 millimeter fluxes suggest a relatively massive disk (Mdisk~0.1 Msun). Nevertheless, the millimeter mass is not enough to sustain increased accretion episodes over large timescales, unless the mass is underestimated due to significant grain growth. We finally explore the possibility of GM Cep having a binary companion, which could trigger disk instabilities producing the enhanced accretion episodes.
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