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		| Paper: | 
		A Cause of Non-Stationary Occupations of Hydrogen Levels Behind a Shock Wave in Stellar Atmospheres | 
	 
	
		| Volume: | 
		510, Stars: From Collapse to Collapse | 
	 
	
		| Page: | 
		294 | 
	 
	
		| Authors: | 
		Bychkov, K. V. | 
	 
	
	
		| Abstract: | 
		It is shown that electron impact ionization from the excited levels which principal quantum number lays in the range 2⩽k⩽6 brings about non-stationary occupation Hydrogen atom when the gas is cooling behind the shock front in a stellar atmosphere. Hydrogen occupation numbers depend on the whole evolution of the gas layer, not only on the current values of temperature and electron density. | 
	 
	
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