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Author Topic: wide binary stars  (Read 2103 times)

admin

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wide binary stars
« on: January 07, 2013, 10:39:46 AM »
Email from James H. this morning with excellent article. 
Marshall

Astrophysicists find wide binary stars wreak havoc in planetary systems
http://phys.org/news/2013-01-astrophysicists-wide-binary-stars-wreak.html

An international team of astrophysicists has shown that planetary systems with very distant binary stars are particularly susceptible to violent disruptions, more so than if they had stellar companions with tighter orbits around them.

Unlike the Sun, many stars are members of binary star systems – where two stars orbit one another – and these stars' planetary systems can be altered by the gravity of their companion stars. The orbits of very distant or wide stellar companions often become very eccentric – ie. less circular – over time, driving the once-distant star into a plunging orbit that passes very close to the planets once per orbital period. The gravity of this close-passing companion can then wreak havoc on planetary systems, triggering planetary scatterings and even ejections.

"The stellar orbits of wide binaries are very sensitive to disturbances from other passing stars as well as the tidal field of the Milky Way," said Nathan Kaib, lead author of a study published today in Nature describing the findings. "This causes their stellar orbits to constantly change their eccentricity – their degree of circularity. If a wide binary lasts long enough, it will eventually find itself with a very high orbital eccentricity at some point in its life."

Jimfarmer

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Re: wide binary stars
« Reply #1 on: January 07, 2013, 08:46:31 PM »
Interesting article, thanks for posting itl
Quote
Unlike the Sun, many stars are members of binary star systems – where two stars orbit one another –

The Zetas claim that the Sun does have a binary partner -- a brown dwarf -- and that Planet X's orbit goes around both of them.

" On Aug 15, 1995 the Zetas went on record stating that our Sun has a binary, and that Planet X orbits both on a long eliptical orbit essentially a sling orbit.  "
http://www.zetatalk.com/theword/tworx534.htm

 

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