- Post Main-Sequence Evolution II...

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Post Main-Sequence Evolution: II Catastrophic Phenomena, and Stars of Greater Mass, Is there life after death? Novae . Sudden brightening of star factor of 10,000 slow decay over several months. Ejection of stellar material into ISM. Binary system; normal star + white dwarf companion Slow transfer of matter to white dwarf Small scale explosion Supernovae Sudden brightening of star in extra-galactic system (must be very bright!) Factor almost 10 10 in brightness Decays slowly, over 1 year Supernovae releases as much energy in scale of a year as sun does over its life on main sequence Two types: Type I: Hydrogen poor spectrum, steady slow decline in brightness Type II: Hydrogen rich spectrum, secondary plateau in brightness 1987a in Large Magellanic Cloud nearest recent example of supernova. Type I Binary system: normal star + white dwarf companion Rapid transfer of stellar matter Mass greater than Chandrasekhar limit Sudden collapse of star Catastrophic explosion Scenario for hydrogen poor,
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This note was uploaded on 01/20/2012 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.

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