Tables 81 7 and 81 8 63 1 



TABLE 817. — Masses and Absolute Magnitudes of Binary Stars 



(Pitman, Astron. Journ. 39, 57, 1929.) 



This paper contains a discussion of the orbits of 104 binary stars and of the relationship between 

 stellar masses and luminosities (Eddington, M. N., March, 1924). In the following table of averages the 

 nagnitudes are visual. Values in blacker type are averages of greater weight. Six planetary nebulae give 

 in average mass of 16.7, absolute magnitude 8.1. 



TABLE 818. — Mass-Luminosity Curve 



(Prepared by Doctor Shapley, 1931.) 

 Masses are stated as logarithms of masses in terms of the sun's mass; the magnitudes absolute bolo- 

 netric. 



Notes added in press. — (Aitken, M. N., 92, 596, 1932.) At least one star in every 18 to 9th mag. is a 

 lose visual double; 1 in 4 or 3, a spectroscopic binary; 1495 of latter known, surely physical doubles. 

 )rbits known for 120 pairs. 



ipectrum B A F G K M B 



7 distribution 1 . 7 21.4 15.3 33. 15.6 1.4 masses 10.6 



Spectroscopic 



A 



5 2 



Visua 



F 

 2.6 



G 

 24 



K 

 2.2 



M sun 

 0.6 1.0 



Smithsonian Tables 



