Where does the 'super red giant' come in a stars life cycle?

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I think it's just before the supernova but i'm not sure??

Thanks :)

Posted Sat 12th January, 2013 @ 17:05 by :) PurpleJaguar (: - Team GR

7 Answers

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Answered Sun 13th January, 2013 @ 15:17 by Tilly - Team GR
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Thanks thats a really good image :)

Do you know hhow the super red giant if formed?

thanks :):)

Answered Sun 13th January, 2013 @ 15:53 by :) PurpleJaguar (: - Team GR
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I found this

To become a red supergiant, a star has to start as a blue giant, i.e. have a mass that is several times larger than our sun's.
As the star furiously uses up its nuclear fuel, fusing hydrogen into helium, it would reach a point where it is short of light elements, and would have to heat up to keep fusing nucleus into heavier ones. That extra heat is provided by the contraction (gravitational collapse) of the stellar core, which increases the center temperature to the point where the heavier elements can fuse. This extra heat also warms up the outer layers which expands and, being more distant from the core, cool off (relatively speaking) hence the red colour.
Ironically, the higher density of the core translates into a lower overall density for the outer layers.
Fusing middle mass element, however, does not provide as much energy as fusing lighter ones, and eventually, the stellar core is filled with elements like nickel and iron, which will only fuse if you give them energy. Therefore the nuclear reaction stops in the core. No longer supported by the radiation pressure from the core heat, the outer layer fall down on the core, and bounce off the core, causing the super nova.
Then now essentially naked stellar core is then left to its won device. If there is enough mass, it will collapse until all the nucleons are "touching" one another (the Pauli exclusion principle prevents from two neutron to occupy the same place) so the stellar core is essentially a huge ball of neutrons.
If the mass of the star is greater than the resistance offered by the Pauli exclusion principle, then the neutrons are crushed further, beyond any capability of resisting said compression, until the stellar core reach a density where nothing, not even light, could escape. That is a black hole.

from: http://answers.yahoo.com/question/index?qid=20090930034420AAnlOAp

Hope it helps.

Answered Sun 13th January, 2013 @ 16:06 by Tilly - Team GR
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Thanks for finding the information for me :P **

Answered Sun 13th January, 2013 @ 16:10 by :) PurpleJaguar (: - Team GR
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That's ok. 

Answered Sun 13th January, 2013 @ 16:46 by Tilly - Team GR
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i have made a mindmap on the lifecycle of stars,

Tilly's overall right, but i dont think it'll come up in that much detail in the exam-i really hope it doesnt anyways,

you can check that out,

Answered Sat 19th January, 2013 @ 19:26 by Pearl Alexus
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Thanks Pearl that was really helpful ;)

Answered Sun 20th January, 2013 @ 10:33 by :) PurpleJaguar (: - Team GR