Coda
Versed in the lewd.
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Well, YEAH, Ia is the oddball that can trigger on as little as 1.4 solar masses. The other supernova types start at 8 solar masses. If we're talking about typical midrange stars in the 1-2 solar mass range, a merger wouldn't cause a supernova because there's actually TOO MUCH energy relative to the masses involved -- the stars will just have a big, flashy outburst instead of collapsing and exploding. Compare a gasoline fireball to a stick of dynamite.For specifically type Ia, yea.
But you aren't taking into account the impact velocity of the stars in question. They would have had to have been smashed together at somewhere approaching or even greater then light speed given the time scale's talked about. So we should be talking high level matter to energy conversion here...
Also, impact velocity doesn't work the way you think it does. It's not possible to get two stars to have a perfect head-on collision, because that would require a perfectly precise trajectory and no rotation -- and all stars rotate. Their mutual gravitational attraction will cause them to enter into a mutual spiral around a common barycenter as at least one of their atmospheres are shredded through tidal effects. Even if the stars are zipping around at huge speeds relative to each other, the actual impact velocity will be surprisingly tiny.