[SKRIVA] Stor stjärna...
- From: Ahrvid <ahrvid@xxxxxxxxxxx>
- To: "skriva@xxxxxxxxxxxxx" <skriva@xxxxxxxxxxxxx>
- Date: Thu, 13 Mar 2014 16:11:20 +0100
Vi känner nog alla dem som inbillar sig att de är Stora Stjärnor, men mest
valsar runt och är uppblåsta.
Men här är en riktig STOR STJÄRNA - 1300 ggr jordens diameter! Och det är en
mycket märklig stjärna också:
http://io9.com/this-is-the-largest-yellow-hypergiant-star-ever-discove-1542279399
"Behold
HR5171A, a massive yellow star that's an unfathomable 1,300 times the
diameter of our sun. It's part of an exotic binary system that was
spotted by an international team of astronomers who say it's now among
the ten largest stars ever found.
HR5171A
just hit the record books for being the largest yellow star we know of.
It's 50% larger than the red supergiant Betelgeuse and about one million
times brighter than the Sun. It measures a breathtaking 1.2 billion
miles (1.8 billion km) in diameter. That's roughly the distance of
Saturn to our sun, about 9.6 AU.
The system
is located about 12,000 light-years away, but remarkably, it's so bright
that it can just be made out by the naked eye. Astronomers have known
about it for at least four decades, but new observations made by the
ESO's Very Large Telescope (VLT) resulted in refined measurements.
As you can see from the ESO's artist impression, the hypergiant has a very
close binary partner. Like, really
close. The two stars are actually touching each other, which is why the
binary system resembles a kind of distorted peanut. It's an eclipsing
system in which the smaller star is passing in front of and behind the
larger one as it orbits in this case once every 1,300 days."
Det är alltså en binär stjärna, som är sammanvuxen med sin kompanjon! Det är
bara centrifugalkraften som håller dem isär.
Fantastiskt!
--Ahrvid
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