SPECTRA OF SOME OF THE BRIGHTER STARS. 
699 
4325 
4314 
4233 
4227 
4176 
4172 
4126 
4101 {h) 
4118 
The photographed spectrum is reproduced in Plate 26, and it will be seen that in , 
addition to the lines given above there is a great number of less prominent lines. 
(2.) Sub-division 
Characteristics of the Spectra. 
All the stars in this sub-division have spectra which very closely resemble the solar 
spectrum. In the spectrum of Arcturus, for example, over one hundred lines have 
been photographed in the region between G and h, and each line has its counterpart 
in the solar spectrum, as will be seen on reference to Plate 30. It appears, therefore, 
that all the substances which are present in the absorbing atmosphere of the Sun, 
are also present in the absorbing atmospheres of the stars of this sub-division. 
The spectra show only small differences when compared with each other. Perhaps 
the greatest is between Capella and Arcturus. In the former the hydrogen lines are 
slightly thicker than in Arcturus, while in the latter some of the lines, especially those 
of calcium, are slightly intensified. The spectrum of Capella more nearly resembles 
the solar spectrum than does that of Arcturus. In Arcturus, also, the continuous 
absorption extends a little further towards G than it does in Capella. 
We may therefore further sub-divide the stars of this sub-division as follows:— 
4 u 2 
