标题： 白矮星-主序星恒星碰撞来自场中的宽三合星 显示英文标题

标题： White dwarf - main sequence star collisions from wide triples in the field

摘要： 当三元或多重恒星系统的外半长轴大于10^3 AU时，它们会与银河系场恒星发生强烈的相互作用。 因此，由两个白矮星（WD）和一个低质量主序星（MS）组成的稳定三元系统可能会因与随机场恒星的引力相互作用而变得不稳定。 这种相互作用足以激发远距离第三颗恒星的偏心率，使其开始与内部双星显著相互作用。 当这种情况发生时，三元系统会经历多次双星-单星共振相遇。 这些相遇可能导致非简并成分与WD之间的碰撞，或者三元系统分解为一个紧凑双星和一个被弹出的第三天体。 紧凑双星可以是幸存或碰撞的MS-WD对，或者是通过引力波辐射逐渐螺旋进入的双WD。 我们计算了MS和WD恒星之间的碰撞率，以及双WD的合并率。 此外，我们还描述了此类碰撞的可探测性前景，这可能类似于次光度的SN事件。 显示英文摘要

摘要： Multiple star systems interact strongly with Galactic field stars when the outer semi-major axis of a triple or multiple star is > 10 3 AU. Stable triples composed of two white-dwarfs (WD) and a low mass main sequence (MS) star in a wide outer orbit can thus be destabilized by gravitational interactions with random field stars. Such interactions excite the eccentricity of the distant third star sufficiently so that it begins to interact significantly with the inner binary. When this occurs the triple undergoes multiple binary-single resonant encounters. These encounters may result either in a collision between the nondegenerate component and a WD, or the breakup of the triple into a compact binary and a third object which is ejected. The compact binary can be either a MS-WD pair which survives, or collides, or a double WD which may inspiral through gravitational wave emission. We calculate the collision rate between a MS and WD star, and the merger rate of double WDs. Additionally, we describe the prospects of detectability of such a collision, which may resemble a sub-luminous SN event.