622 



TABLE 797. — Spectrum Types and Absolute Magnitudes 



(Stromberg, Mt. Wilson, Astrophys. Journ., 72, in, 1930; 73. 40, 1031; 74, no and 342, 1031. See also Wilson, 



Astron. Journ., 41, 169, 1932.) 



Statistical discussion of distribution of absolute magnitudes among the various spectrum 

 groups. Figures marked** relate to supergiants,* normal giants, f dwarfs, *f normal giants 

 and dwarfs, and refer to the groups of which the numbers thus marked are maxima. The 

 subscripts are the percentages in the various groups. The first line of the table shows the 

 number of stars used in the discussion for the column, but the figures in the columns are 

 reduced so that the distribution is for 1000 stars in each group. 



Summary (mean abs. magnitude) 



No. Super- Bright Normal 



Spectrum stars giants giants giants 



Mo to M9 247 -4-5(9) -0.2(91) 



-4-5(7) -0.1(91) 



+0.3(78) 



+0.4(49) 



+ 1-2(25) 



Faint 

 giants 



Dwarfs 



K 3 



Ko 

 Go 

 Fo 

 A2 



K 9 

 K2 

 G 9 

 F 9 

 A 5 



247 

 378 

 1058 

 601 

 622 

 478 



+6.7(2) 

 +6.1(1) 

 +4-2(9) 



-2.5(14) +0.3(78) +2.7(7) 



-3-o(i9) +0.4(49) +2.8(23) 



-3-o(9) +1-2(25) +3-2(46) 



-3-2(i5) .... +1.2(85) 



The small percentage of dwarf stars is due to the fact that their apparent magnitudes in 

 most cases are fainter than the set limit of 6.0. 



Smithsonian Tables 



