Andromeda Galaxy外围的一个新的亮蓝变星
A New Luminous blue variable in the outskirt of the Andromeda Galaxy
摘要：
热的大质量亮蓝变星（LBV）是大质量恒星演化的重要阶段。在这里，我们报告在仙女座星系遥远的郊区发现了一个新的LBV - LAMOST J 0037 +4016。它位于M31的西南角（可能是一个微弱的旋臂），与中心的投影距离出乎意料的大，为$\sim$ 22 kpc。光学光变曲线表明，在$V$带有1.2等的变化，其爆发和平静阶段都持续了几年。观测到的光谱表明，A型超巨星在时代接近爆发阶段和热的B型超巨星与弱[Fe II]发射线的时代更暗淡的亮度。近红外色-色图进一步显示它遵循银河系和M31 LBV的分布，而不是B[e]超巨星。所有现有的数据都有力地表明LAMOST J 0037 +4016是一种LBV。通过光谱能量分布拟合，我们发现它有一个光度（$4.42 \pm 1.64$）$\times 10^5$ $L_{\odot}$和一个初始质量$\sim 30$ $M_{\odot}$，表明它属于低光度类LBV。
英文摘要：
The hot massive luminous blue variables (LBVs) represent an important evolutionary phase of massive stars. Here, we report the discovery of a new LBV -- LAMOST J0037+4016 in the distant outskirt of the Andromeda galaxy. It is located in the south-western corner (a possible faint spiral arm) of M31 with an unexpectedly large projection distance of $\sim$ 22 kpc from the center. The optical light curve shows a 1.2 mag variation in $V$ band and its outburst and quiescence phases both last over several years. The observed spectra indicate an A-type supergiant at epoch close to the outburst phase and a hot B-type supergiant with weak [Fe II] emission lines at epoch of much dimmer brightness. The near-infrared color-color diagram further shows it follows the distribution of Galactic and M31 LBVs rather than B[e] supergiants. All the existing data strongly show that LAMOST J0037+4016 is an LBV. By spectral energy distribution fitting, we find it has a luminosity ($4.42 \pm 1.64$)$\times 10^5$ $L_{\odot}$ and an initial mass $\sim 30$ $M_{\odot}$, indicating its nature of less luminosity class of LBV.
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