What Causes Symbiotic Novae to Re-Explode?

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Symbiotic novae are binary star systems where a white dwarf accretes hydrogen from a companion star, leading to thermonuclear runaway explosions on the white dwarf's surface. These explosions can release energy equivalent to the sun's output over 10,000 years, while only ejecting a small fraction of the white dwarf's mass, allowing it to return to its prenova state. This process can occur repeatedly every few thousand years. The discussion highlights the mechanisms behind the re-explosion of symbiotic novae and provides resources for further exploration of the topic. Understanding these phenomena contributes to the broader knowledge of stellar evolution and explosive astrophysical events.
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what mechanism make them to re-explode? what are symbiotic novae ?
 
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White Dwarfs can go nova by accreting hydrogen from a neighbouring star; the gas is compressed by the extreme gravity of the white dwarf causing a thermonuclear runaway explosion on the surface (temperatures up to 20 million k). During a nova explosion, the energy released can equal what the sun emits over 10,000 years. The mass ejected only makes up about 1/10,000th of the white dwarfs mass, which means the star stays intact and can return to its prenova state. The process can be repeated every few thousand years.
 
except wiki where i can find a nice article on nova?
 
http://hubblesite.org/newscenter/archive/releases/star/nova/1997/29/text/

The 'cosmic cinema' by the Max Planck Institute also has a short, low res video regarding Nova-
http://www.mpa-garching.mpg.de/museum/museum/index_e.html
 
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thanks steve!
 

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