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Very close sister stars?

by cph
Tags: sister, stars
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cph
#1
May20-11, 09:46 PM
P: 45
Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs parallax, which corresponds to about 1.3 pc or 4.3 yrs away. Since stars form in multiple; hence our sun has sister stars at much closer distance, with higher parallax values. Also infrared telescope could be used to look for cold gas giants, and compare image size for relative closesness. In fact does the Brown dwarf survey, and other surveys, include some large infrared planets which indicate a nearby sister star? Such sister stars would have a center of mass, and hence via central force, one would have a spherical distributed cometary cloud - a common Oort cloud. So does our Oort cloud enclose a multi-stellar system?
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Vanadium 50
#2
May21-11, 06:00 AM
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Quote Quote by cph View Post
Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs parallax, which corresponds to about 1.3 pc or 4.3 yrs away.
So far so good.

Quote Quote by cph View Post
Since stars form in multiple;
Sometimes.

Quote Quote by cph View Post
hence our sun has sister stars at much closer distance, with higher parallax values.
This doesn't logically follow. Observationally, it appears to be untrue.

Quote Quote by cph View Post
Also infrared telescope could be used to look for cold gas giants, and compare image size for relative closesness.
Yes, but a gas giant is not a star.

Quote Quote by cph View Post
In fact does the Brown dwarf survey, and other surveys, include some large infrared planets which indicate a nearby sister star?
No.

Quote Quote by cph View Post
Such sister stars would have a center of mass, and hence via central force, one would have a spherical distributed cometary cloud - a common Oort cloud. So does our Oort cloud enclose a multi-stellar system?
And no.
Nik_2213
#3
May21-11, 01:32 PM
P: 217
Uh, IIRC, the infrared survey results are not all in. However, no obvious candidates for red or brown dwarf stars have yet jumped out of the search. There may be ultra-dim stars, there may be ice-planets, but they'll take some finding and much confirmation.

Odds are good on lots of 'plutoid' objects, and possibly a couple of distant 'neptunians'. IMHO, finding 'Nemesis' is unlikely...


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