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		| Paper: | 
		White  Dwarfs Undergoing Hydrogen Shell Burning in Single Degenerate Binary Systems | 
	 
	
		| Volume: | 
		342, 1604-2004: Supernovae as Cosmological Lighthouses | 
	 
	
		| Page: | 
		158 | 
	 
	
		| Authors: | 
		Orio, M. | 
	 
	
	
		| Abstract: | 
		I review recent X-ray observations of potential type Ia supernova progenitors: white dwarfs in “single degenerate systems” that are undergoing hydrogen shell burning. Both the spectra and the light curves offer a wealth of information. | 
	 
	
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