[Lonesome in Massachussets]

Hard to imagine this setup is long-term stable

True. It is bound to become a Type Ia supernova. Because of its rapid rotation, it can exceed the Chandrasekhar limit for a while, but not for long.

If the distance to this pair can be established by parallax, it would be a nice calibration point for this standard candle.

[SunkenCiv]

Thanks Lonesome in Massachussets!