2000万年前UXOR RZ Psc的吸积活动耀斑
Flares of accretion activity of the 20 Myr old UXOR RZ Psc
摘要：
我们讨论了神秘的孤立UX Ori型恒星RZ Psc的吸积活动和运动学的修订。在此之前，RZ Psc被认为只具有在碱金属的低激发线流出的光谱特征。档案高分辨率光谱揭示了一个短暂的插曲，磁层吸积系统中观察到通过逆P Cyg配置文件在H $α$和CaII 8542 $\unicode{x212B}$线。在CaII 8542 $\unicode{x212B}$同时存在的吸积和外流特征表明，RZ Psc风的吸积驱动的起源。我们认为，RZ PSC的经验，通过磁螺旋桨机制，但可变的吸积情节允许它有时在磁层吸积制度。在恒星的深光度最小值处用光谱观测到的恒星表面热吸积点的辐射也支持了系统中弱吸积的存在。用新的GAIA DR 2天体测量数据计算的RZ Psc的银河系运动表明，它可能是Cas-Tau OB协会的成员，年龄为$t=20^{+3}_{-5}$ Myr。
英文摘要：
We discuss a revision of accretion activity and kinematics of the enigmatic isolated UX Ori type star RZ Psc. Previously, RZ Psc was known to possess only spectroscopic signatures of outflow in the low-excitation lines of alkali metals. The archival high-resolution spectra reveal a short-lived episode of magnetospheric accretion in the system observed via inverse P Cyg profiles at the H$α$ and CaII 8542 $\unicode{x212B}$ lines. The simultaneous presence of accretion and outflow signatures at CaII 8542 $\unicode{x212B}$ is suggestive of an accretion-driven origin of the RZ Psc wind. We argue that RZ Psc experiences matter ejection via the magnetic propeller mechanism but variable accretion episodes allow it to sometimes move in the magnetospheric accretion regime. The presence of the weak accretion in the system is also supported by the radiation of the hot accretion spot on the stellar surface observed spectroscopically at the deep photometric minimum of the star. The Galactic motion of RZ Psc calculated with new GAIA DR2 astrometric data suggests possible membership in Cas-Tau OB association with an age of $t=20^{+3}_{-5}$ Myr.
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