This research led by a team of researchers from the University of Turku in Finland with Pablo Rodríguez Hill from the Institute of Astrophysics of the Canary Islands, means that V Sge is on its way to a spectacular end with a double explosion, it would not be a single explosion, it would be two explosions.
This system is also formed by two stars similar to T Coronae Borealis, in this case we have a white dwarf, which is a stellar remnant of a star similar to the sun that is stealing matter from another star larger than our sun, even more massive that has about 3.3 times the solar mass. The difference is that the big star orbits very close to the white dwarf, the big star is circling the small one, it makes one revolution in just 12.3 hours, that is going very fast for a star.
In fact, researchers call all this a feeding frenzy because the white dwarf is devouring material from its companion at an impressive rate, which is generating a hot accretion disk and a massive gas aloe around the system, all of this making it shine unusually, being the most luminous of its class, a class known as a super-soft cataclysmic variable.
Yes, they have combined cataclysm with super soft, it sounds contradictory, but it is extremely dangerous because we are not talking about a single explosion, but two. The calculation is as follows, in the next few years they estimate that it will explode between 2040 and 2070, it is a wide margin, but the calculations are complicated in this case, that it will explode, it will explode and it will explode in this century, they are clear about that.
But when exactly? the margin is wide, the matter accumulated in the white lullaby will detonate in a nova, a superficial explosion of hydrogen like T Coronae Borealis, a star, but brighter than Sirius in particular, Sirius is the brightest star in the night sky, so good, but there is more, a few years later a reaction occurs, a rebound. They estimate that around 2067 or at the end of the century at most, but not much further.
The two stars will get so close due to the loss of angular momentum due to that Nova explosion that they will end up colliding and this will trigger a type 1A supernova, it will be so bright that it could be seen even during the day, a brightness somewhat less than that of the full moon, but concentrated in a single point. Giving another example, it would be something similar to Venus, that we can see Venus in the late afternoon or early morning, but much more intense and visible at noon, so it will be quite spectacular.
It will not be a danger for us, since it is between 7,800 to 10,000 light years and it is a more than safe distance for us, but for stars that are less than 160 light years away, if there are planets with life and depending on how far away they are, they can suffer from total annihilation to minor alterations in their atmosphere, including, of course, mass extinctions.
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