1889.] of the various Species of Heavenly Bodies. 



259 



densed from the same nebulosity or not ; but since the components of 

 the majority of binary stars appear so far to have had in all pro^ 

 bability a common origin, there is no reason why we should rather 

 regard these as having had a different one. The following is a list of 

 them taken from Smyth's ' Celestial Cycle ' : 



Table IV. Binary Stars, Class 4. 



VIII. Binary Stars, Class 5. Unequal Magnitudes, the fainter Star 



being Red. 



There are a few binary stars in which the companion is red. The 

 red component has probably a smaller mass than the primary, and is 

 consequently, further advanced along the temperature curve. Fig. 25 



FIG. 25. Light curves of the components of a binary star of Class 5, in which the 

 companion is red and relatively small. 



