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Multiple star systems interact strongly with Galactic field stars when theouter semi-major axis of a triple or multiple star is > 10 3 AU. Stable triplescomposed of two white-dwarfs (WD) and a low mass main sequence (MS) star in awide outer orbit can thus be destabilized by gravitational interactions withrandom field stars. Such interactions excite the eccentricity of the distantthird star sufficiently so that it begins to interact significantly with theinner binary. When this occurs the triple undergoes multiple binary-singleresonant encounters. These encounters may result either in a collision betweenthe nondegenerate component and a WD, or the breakup of the triple into acompact binary and a third object which is ejected. The compact binary can beeither a MS-WD pair which survives, or collides, or a double WD which mayinspiral through gravitational wave emission. We calculate the collision ratebetween a MS and WD star, and the merger rate of double WDs. Additionally, wedescribe the prospects of detectability of such a collision, which may resemblea sub-luminous SN event.

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