Very close sister stars?

*cph*

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?

Vanadium 50

Quote by cph

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 by cph

Since stars form in multiple;

Sometimes.

Quote by cph

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 by cph

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 by cph

In fact does the Brown dwarf survey, and other surveys, include some large infrared planets which indicate a nearby sister star?

No.

Quote by cph

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

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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Nik_2213	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...