We don't have to worry too much about our Sun.
But the Sun is alone up there, making things simpler and more predictable.
Astronomers know of more than 1,000 CVs, and only a dozen of those have orbits shorter than 75 minutes. But the authors of this study found the closest orbit yet. This pair of stars needs only 51 minutes to complete an orbit. This is rare, and the binary pair is evidence of a missing link in astrophysics.. The lead author is Kevin Burdge from the Department of Physics at MIT. The stars in this study are about 3,000 light-years away in the direction of the Hercules constellation.
Astronomers have discovered other eclipsing binaries, but none this close together. Not only are the pair extremely close to one another, but they eclipse each other from our line of sight. This gave the researchers multiple opportunities to observe the eclipses and to take precise measurements for both stars., a notable public-private partnership engaged in an optical study of the northern sky looking for transient phenomena like variables. But the name isn't that important.
Before this study, the evolution from hydrogen accretion to helium accretion in helium CVs was unclear. Astronomers had never observed a star making the transition. The simulations show that in about 70 million years, the pair will grow even closer until their orbital period is only 18 minutes. At that point, it'll be a helium CV binary. That transition is"… a previously missing link between helium CV binaries and hydrogen-rich CVs," the authors write.
France Dernières Nouvelles, France Actualités
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