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then the exposed helium core explodes. As with Type II supernovae, the explosion is triggered by the collapse of its iron core. Type Ib and Ic supernovae are (slightly) less spectacular than Type Ia supernovae. ... the production of radioactive isotopes, for example 56Ni and 57Ni and their subsequent decay to 57,56Co and...
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www.talkorigins.org/faqs/supernova/
www.talkorigins.org/faqs/supernova/
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Basically, type I supernovae have no hydrogen in their spectrum; type II supernovae do. Two mechanisms are involved: thermonuclear explosion in white dwarfs and gravitational collapse ... A combination of instabilities now leads to the implosion of the iron core to a neutron star. ... Supernovae are major element factories,
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www.answers.com/topic/supernova
www.answers.com/topic/supernova
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Through a process that is not completely understood, some of the gravitational potential energy released by this core collapse is converted into a Type Ib, Type Ic, or Type II supernova. ... although current computer models of Type Ib, Type Ic, and Type II supernovae account for part of the energy transfer, they are not able...
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www.answers.com/topic/stellar-evolution
www.answers.com/topic/stellar-evolution
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In these highly evolved stars the core is largely iron but as it continues to contract and heat up no burning turns on to halt the collapse and there comes a point when the thermal radiation is sufficient to dissociate the iron nucleus back into alpha particles - the so-called iron helium-phase transition...
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www.shef.ac.uk/physics/teaching/phy320/topic7.html
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atomic number or weight that occur around 50 and 82 protons (tin, lead) and 50, ..... Production of iron peak elements continues until the core mass ... Tl. Excesses of Y, Zr, and Ba in the spectra of some highly evolved stars (often ... been disputed, but intermediate zones of Type II supernovae are the best bet ...
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www.springerlink.com/index/W301154042608780.pdf
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The onion-like layers of a massive, evolved star just prior to core collapse. ... In a typical Type II supernova, the newly formed neutron core has an initial .... old red giant stars, which produces these elements much more slowly, ... Supernova production of heavy elements over astronomic periods of time ...
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wapedia.mobi/en/Supernova?t=6.
wapedia.mobi/en/Supernova?t=6.
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The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally: ... a. iron is the heaviest element, and sinks upon differentiation ... Type II supernovae occur:
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panda.unm.edu/Courses/Brandt/TEST3.html
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1 from highly evolved nuclear material near the core of a supernova offers two plausible explanations for deep-seated, ... [35]. 2. Ninham [2] predicts Bose-Einstein condensation of the dense plasma into a superconductor for the highly evolved nuclear material produced by Type I and II supernovae (Fig. 1).
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www.omatumr.com/abstracts2003/jfe-superfluidity.pdf
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, with the main sequence spectral type depending upon the mass of the star. Small, ... Since this lifts the outer layers away from the core, thus reducing the gravitational pull on them, they expand faster than the energy production increases, thus causing them to cool, ... , and have been measured for many evolved stars.
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www.absoluteastronomy.com/topics/Stellar_evolution
www.absoluteastronomy.com/topics/Stellar_evolution
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