Astronomy 10 11.6.06 - Astronomy 10 Stars 11/6/06 Mass is...

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Astronomy 10 Stars 11/6/06 Mass is the defining feature in stars Some stars have slightly different chemistry then other stars, but most stars are hydrogen and helium Spin rate can also make a difference in stars Amount of magnetic field varies from star to star Almost everything about a star is reckoned my mass Also a distinction of what becomes a star Brown dwarfs have fusion (lithium and duterial) but it is trivial o Even Jupiter would do duterial fusion o So minor that most everybody ignores it The proton-proton chain is the key characteristic for a star o Need at least 80 times the mass of Jupiter to spark the proton-proton chain o The smallest object to spark fusion is a red dwarf Has just enough mass to spark fusion in the core Will glow a dull red At the extreme bottom of the main sequence Has very little fuel, but it uses very little fuel Has enough fuel to last for a trillion years No red dwarf has yet dies because there hasn’t been a trillion years yet
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This note was uploaded on 04/01/2008 for the course ASTRO 10 taught by Professor Norm during the Fall '06 term at University of California, Berkeley.

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Astronomy 10 11.6.06 - Astronomy 10 Stars 11/6/06 Mass is...

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