论文标题
白矮人 - 田间宽三联的主要序列星碰撞
White dwarf - main sequence star collisions from wide triples in the field
论文作者
论文摘要
当三颗或多个恒星的外半高轴> 10 3 au时，多个恒星系统与银河场恒星相互作用。稳定的三元组由两个白色矮人（WD）和宽外轨道中的低质量主序列（MS）恒星组成，因此与随机场恒星的重力相互作用可以不稳定。这种相互作用充分激发了遥远的第三颗恒星的偏心率，因此它开始与内部二元相互作用。当这种情况发生时，三重会发生多个二进制谐振遇到。这些相遇可能会导致非等级组件和WD之间的碰撞，或者将三重分解为弹出的紧凑型二进制和第三个对象。紧凑型二进制可以是幸存下来的MS-WD对，也可以是碰撞的MS-WD对，也可以是通过重力波发射启发的双WD。我们计算MS和WD星之间的碰撞率，以及双WDS的合并速率。此外，我们描述了这种碰撞的可检测性的前景，这种碰撞可能类似于亚光SN事件。
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.
