736 



The diminution of the quotient shows that tliose influences which 

 later on retard the decrease to a iiigher degree than the theorj 

 requires, begin to manifest themselves even in the first stage. However 

 that may be, the order of magnitude of A as found here cannot 

 but be correct, and from it conclusions may be drawn as to the 

 constitution of the Novae. 



When all quantities are expressed in the absolute system, t is 



measured in seconds; taking 0.21 as a mean value of the quotient 



in the above table we have 



yl — 0,21 : 86400 = 2,5 . 10-6, 



For Nova Aquilae about the same value is found. 



11. 



The distribution of pressure and temperature for t = 0, which is 

 required for a uniform expansion, and the dependence of A on this 

 distribution are determined by equation (3) in which we shall now 

 leave out the indices 0; 



or 



or 



;■ 



p :=. -\- A'^ Xgrdr. 



R 

 where R is the radius of the external surface, where p = 0. If a 

 definite density-distribution is assumed as existing at the moment 

 of flaring up, the latter equation determines the pressure as a function 

 of r, and therefore also the temperature: 



)■ 

 A"* r 



T = or dr . (7) 



A"" r 



1 or dr 



For the density the values have been assumed which Emden 



