[plaskett] the spectroscopic BINARY /? ORIONIS 



NORMAL PLACES /3 ORIONIS. 



223 



With these normal places and by the graphical jnethod developed 

 by Dr. W. F. King ^ the elements given below were readily determined 

 with which the observations seemed to agree closely. However^ owing 

 tc the considerable differences in the weights of the normal places, which 

 could not very well be allowed for in a graphical solution and to the 

 advantages demonstrated by previous experience it was felt desirable to 

 apply a least squares correction to these elements. 



For coefiScients of the corrections the equations developed by 

 Lehmann-Filhes ^ were used and from these and the ephemeris obtained 

 from the normal places and preliminary elements, the following obser- 

 vation equations were derived. All of the elements except the period, 

 which was considered as closely determined as possible from the range 

 of velocity present and the short interval used, were included in this 

 solution and an unknown of coefficient unity for the velocity of the sys- 

 tem was added. 



1 Report of Chief Astronomer, 1907-1908, p. 333 ; also Astrophysical Journal, 

 XXVII, p. 125. 



2 A N., No, 3242. 



