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VAEIATION OF THE STAE C.P.D. - 41°-4511. 



By a. W. Egberts, D.Sc. 



(Eead October 2, 1901.) 



The star C.P.D. - 41°-4511 



E.A. lOh. 16m. 44s. (1875) 

 Dec. 41°43'-8 



has recently been discovered, through the assiduous and fruitful 

 industry of Mr. E. T. A. Innes, of the Eoyal Observatory, to be an 

 Algol variable of a very interesting type. 



I purpose in the present paper stating very briefly what this type 

 of variation is, and indicating the physical conditions of orbital 

 movement that have produced the light changes observed. 



The star came under observation at Lovedale in July of this year. 

 A few nights' observation was sufficient to establish the fact that the 

 star was an Algol variable. 



By the end of the month sufficient measures had been secured to 

 yield a full light curve. 



It was matter of some regret that the western position of the star 

 in the evening sky prevented an extended series of observations from 

 being taken every evening. Still, as stated, enough observations were 

 obtained to indicate unmistakably the complete form of the light 

 curve. 



Mr. Innes was good enough to send me some of his earlier 

 measures, and these, combined with my own, yield as the full period 

 of variation — 



Id. 20h. 30m. 3s. 



With this period all the observations made were reduced to the 



