Monday, February 20, 2012

Is there habitable zone for planets in a binary star system of blue giant and sun-like star?

In a binary system of blue giant (3.2 masses of sun) and a sun-like star orbiting each other what would be a necessary distance between the stars (in AU) to create a habitable zone for planets orbiting those stars individually and what would be the distance beween star and its planets in both cases to make the planets habitable?Is there habitable zone for planets in a binary star system of blue giant and sun-like star?You could have a habitable zone in terms of distance, but not time. The Blue Giant star will not last long enough, and will explode before life could get going for very long. If the habitable zone is 1 AU from the Sun like star, then the Blue Giant has to be at least 10 AU, though it might be a little farther. It helps to have resonance to keep the orbit stable.Is there habitable zone for planets in a binary star system of blue giant and sun-like star?I bow to anyone who knows enough physics and the typical mass of a blue giant but, to my feeble mind, it doesn't seem reasonable for there to b a "habitable" zone because the gravity of the blue giant would be so strong. If it's massive enough to have a common center of gravity with something the size of our sun then I don't see how anything planetary could survive being incorporated into the giant.



Even if something fell within the gravity of both at a safe distance from the smaller star it would have to pass between the two at some time and then be vaporized by the blue.



Please don't take this as a correct answer though even if someone later proves it right since I could not back it up with facts....just my understanding:)



I hope someone is able to answer with more confidence though. I'd like to know too:)Is there habitable zone for planets in a binary star system of blue giant and sun-like star?Unless the planet is *very* far away from the center of mass of the two stars, I don't see how it could maintain a stable orbit. If it really *is* that far away, it'd be out of the habitable zone...



I guess if the 2nd star was out, say... beyond where Jupiter lies in our system, you might have a planet orbiting the blue star with a *very* long period 2nd star orbiting the primary - out far enough such that it's mass wouldn't affect the planet's orbit much.



At some point during that planet's year, there'd be no "night", and at other points, it would have two suns during the day.

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