论文标题

分离的序列序列星V347 Aurigae的周期性爆发变化

Periodic Eruptive Variability of the Isolated Pre-Main Sequence Star V347 Aurigae

论文作者

Dahm, S. E., Hillenbrand, L. A.

论文摘要

V347 Aurigae与小的乌云L1438相关,似乎是位于距离$ d \ $ d \ $ 200 PC的隔离前序列星。多上述档案光度法揭示了周期性的亮度变化,幅度$ v \ 2.0 $幅度发生在$ \ sim $ 160天的时间尺度上,数十年来持续存在。常规的节奏,带有Zwicky瞬态设施的源的光学成像表明,由V347 Aur照亮的小反射星云也会以亮度波动,有时会完全褪色。多上座,凯克/雇用数据表明存在两个不同的光谱成分:突出的发射线主导的光谱,具有与明亮的光度态相关的重度连续性,以及与Quiescence相关的M型吸收线光谱。所有光谱都表现出强大的Balmer,并且我的线排放与积聚一致,以及由[O I],[N II]和[S II]的禁止过渡产生的高速速度发射,这些过渡通常与准确的喷气机和磁盘风相关。在现有的高色散光谱或高分辨率成像中没有证据表明V347 AUR的二进制。重复爆发事件可能与未检测到的伴侣或结构磁盘内定期提高质量积聚率的结构引起的积聚不稳定性有关。 V347 AUR可能类似于Exor Type变量,尽管经常出现。

V347 Aurigae is associated with the small dark cloud L1438 and appears to be an isolated pre-main sequence star located at distance $d\approx$200 pc. Multi-epoch, archival photometry reveals periodic brightness variations with amplitude $V\approx2.0$ magnitudes occurring on timescales of $\sim$160 days that have persisted for decades. Regular cadence, optical imaging of the source with the Zwicky Transient Facility shows that a small reflection nebula illuminated by V347 Aur also fluctuates in brightness, at times fading completely. Multi-epoch, Keck/HIRES data suggests the presence of two distinct spectral components: a prominent emission-line dominated spectrum with a heavily veiled continuum correlated with the bright photometric state, and an M-type absorption line spectrum associated with quiescence. All spectra exhibit strong Balmer and He I line emission, consistent with accretion, as well as high velocity emission arising from the forbidden transitions of [O I], [N II], and [S II] that are generally associated with collimated jets and disk winds. There is no evidence in existing high dispersion spectroscopy or high resolution imaging for binarity of V347 Aur. The repeating outburst events are possibly linked to accretion instabilities induced by an undetected companion or a structure within the circumstellar disk that periodically increases the mass accretion rate. V347 Aur is perhaps analogous to an EXor-type variable, though more regularly recurring.

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