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When Stars Blow Up What Stars Explode? •Cataclysmic variables •Novae •Supernovae Cataclysmic Variables •Binary star systems incorporating a white dwarf •Outbursts due to disk instabilities GK Per = Nova Per 1901 Novae Thermonuclear detonations on a white dwarf •Hydrogen accumulates, mainly from accretion in a CV •At the base of the accreted layer, electrons become degenerate •When the temperature reaches a few MK, fusion begins •Degenerate fusion is a runaway. •All the H fuses to He and heavier elements in a soundcrossing time (a few minutes) •The star increases in brightness ~ 10,000 times •Most of the matter is ejected Supernovae Supernova Collapse of a massive stellar core •Type Ia: core collapse of a 1.4 M white dwarf o complete detonation of the core - no remnant •Type II: core collapse of a star with M > 8M o yields a neutron star or black hole o core collapses when fuel all used up and gravity wins Will the Sun Explode? No! •The sun is not a white dwarf •The sun is not in a binary system •The sun is not a high mass star The Fate of the Sun •Brightens on main sequence •Red Giant •Planetary nebula + WD