Most distant symbiotic binary star

In September 2008, a team of scientists, using the Gemini Telescope’s GMOS instrument (Gemini Multi-Object Spectrograph), discovered two stars in a true binary system of magnitude V=24.6 orbiting each other at a distance from Earth of approximately 2.5 million light years. The binary system, comprising a Red Giant and a White Dwarf, is called IC10 StSy-1 and lies in the small Starburst galaxy IC10, which is part of the Local Group of galaxies. As with most binary star systems, the smaller White Dwarf star will ultimately rip material from the larger Red Giant as this star expands in its later stages of stellar evolution, hence entering truely symbiotic relationship. This will increase the mass of the White Dwarf until it reaches sufficient mass to cause a Supernova explosion. This is the common route to the formation of a Type 1a Supernova, and finding a system outside our own Milky Way is important to understand how binary systems and supernova are created.