在主序前光谱双星中寻找由磁重联产生的毫米耀斑
Hunting for millimeter flares from magnetic reconnection in pre-main sequence spectroscopic binaries
摘要：
最近对低质量主序前偏心光谱双星DQ Tau和V773 Tau A的观测表明，它们的毫米光谱偶尔会被来自非热发射过程的耀斑所主导。瞬时活动被认为是同步加速的性质，由强大的磁重联事件引起，当双星组件的单独磁性结构能够相互作用并被迫重组时，通常在近星点附近。我们进行了第一次系统的研究，毫米的变化对样本的12 PMS光谱双星的目的是表征扩散的耀斑之间的来源可能会遇到类似的interbination事件。源样本包括短周期，近距离的双星，拥有一个高的轨道偏心率或圆形轨道。利用IRAM 30米望远镜上的MAMBO 2阵列，我们在1.25毫米处进行了连续4夜的监测，在此期间，所有的高偏心率双星接近近星点。我们还获得了同步光学VRI测量，因为恒星重联事件和光学增亮之间经常观察到强烈的联系。UZ Tau E是唯一一个在毫米波长下被探测到的光源：它表现出显著的变化;它也是唯一一个同时发生强烈光学变化的光源。这颗双星在目前的样本中拥有最大的轨道偏心率，这是恒星间磁相互作用事件的一个预测因素。由于轨道参数和可变吸积活动与DQ Tau相似，UZ Tau E的毫米行为与DQ Tau碰撞磁层模型有许多相似之处。然而，仅根据我们的观测，我们无法确定这种变化是否是重复性的，或者它是否也可能是由于电离风中的可变自由-自由发射。
英文摘要：
Recent observations of the low-mass pre-main sequence, eccentric spectroscopic binaries DQ Tau and V773 Tau A reveal that their millimeter spectrum is occasionally dominated by flares from non-thermal emission processes. The transient activity is believed to be synchrotron in nature, resulting from powerful magnetic reconnection events when the separate magnetic structures of the binary components are capable of interacting and forced to reorganize, typically near periastron. We conducted the first systematic study of the millimeter variability toward a sample of 12 PMS spectroscopic binaries with the aim to characterize the proliferation of flares amongst sources likely to experience similar interbinary reconnection events. The source sample consists of short-period, close-separation binaries that possess either a high orbital eccentricity or a circular orbit. Using the MAMBO2 array on the IRAM 30m telescope, we carried out continuous monitoring at 1.25 mm over a 4-night period during which all of the high-eccentricity binaries approached periastron. We also obtained simultaneous optical VRI measurements, since a strong link is often observed between stellar reconnection events and optical brightenings. UZ Tau E is the only source to be detected at millimeter wavelengths: it exhibited significant variation; it is also the only source to undergo strong simultaneous optical variability. The binary possesses the largest orbital eccentricity in the current sample, a predicted factor in star-star magnetic interaction events. With orbital parameters and variable accretion activity similar to DQ Tau, the millimeter behavior of UZ Tau E draws many parallels to the DQ Tau model for colliding magnetospheres. However, on the basis of our observations alone, we cannot determine whether the variability is repetitive, or if it could also be due to variable free-free emission in an ionized wind.
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