Tables 8 1 3-8 1 5 629 



(Tables abridged by permission from Russell, Dugan, and Stewart, Astronomy, Ginn & Co., 1927.) 



TABLE 813.— Visual Binary Stars 



Burnham's General Catalogue, 1906, 3,665 pairs. Card catalogue kept by Aitken at Lick Observatory. 

 Of stars brighter than 6.5 mag., one in 9 visual double. See also Aitken, The binary stars, McMurtrie, 

 1918, and New General Catalogue, Carnegie Institution, 1932; Innis, Southern double star catalogue' 

 x 9 2 7- 



e is eccentricity, a major axis in seconds of arc, A in astronomical units of orbit. 



a Aur. 

 8 Equ. 

 a CMi. 

 aCMa 

 £ UMa 

 a Cen . 

 £ Boo. 

 02 Eri. . 

 a Gem . 

 77 Cas . . 



Magnitude 



0.8, r.i 



5-2, 5-7 



o-5. 13 



-1.6, 8.4 



4.4, 4.9 



0.3. i-7 



4.8, 6.7 



9.7, 11.4 



2.0, 2.8 



3-7. 7-4 



Spectra 



Go, F5 

 F5 

 F5 



Ao, Fo 

 F9, G2 

 Go, K5 

 G6, K4 

 Ao, M6 

 Ao, Ao 

 F8, Ko 



4-2, 3-3 



1.1, 

 2.44, 

 0.7, 

 1. 10, 



•53. 

 •44, 



•4 

 .96 



•7 

 •94 

 •47 

 .20 



Abs. mag. 



— O, 



4 

 3- 

 1. 



5. 

 4- 

 5- 

 1 1 

 1 

 5 



0.1 



4.6 



15-5 



11.3 



5-7 



6.1 



7.8 



.4, 12.9 



.4, 2.2 



.0, 8.7 



TABLE 814. — Spectroscopic Binary Stars 

 Stars so close not yet visually double. Discovered and studied through shift of spectrum lines (Doppler 

 effect), i is inclination of orbit to "plane of sky," m, masses of components. The percentage with periods 

 <io d:7i for O and B stars; 64, A; 52, F-G; 16, K-M; periods >ioo d, percentages are 12, 6, 18, 61. 

 See Lick Obs. Bull. No. 355. 



TABLE 815. — Spectroscopic Eclipsing Binaries 

 Some 200 known. Last column, distance between center of two stars = radius of relative orbit. See 

 >hapley Contr. 3, Princeton Univ. Obs. 



* Radii in terms of the relative orbit as unit, t Radius of relative orbit. 

 mithsonian Tables 



