STUDIES ON THE VARIABLES OF THE ALGOL-TYPE. 13 



8. Period subjected to an inequality. 



+ 95™ sin (0°.08 E + 283°). 

 The minimum is flat, lasting about two hours. 



9. Sawyer's light-curve shows the secondary unduration like S Cancri 



and otliers. The minimum of the similar type is repeated alter- 

 nately in the diöirent intervals and the both periods are subjected 

 to the following inequalities. 



even min. - 0''.000000Û255 E," 



cdd min. +O^'.O0OO0OO19O Ä'.^ 



10. This has been admitted into tlie Algol-type by Hartwig since 1900: 



but the light-curve by Roberts, which is reproduced in Gierke's 

 " the System of Stars," indicates that tliis star belongs to ß Lyrae- 

 type. I put this star in this list with a question mark. 



11. Nearly symmetrical, but the increase of light is a little faster. 



12. This star also shows two kinds of light-curves, both similar but in 



different periods like Y Cygni. The Principal minimum is of the 

 magnitude S"'.3, ai;d the secondary is of 7'".6, both appearing 

 alternately in the interval 47 and 49 succeeding the other. 



13. Eoberts considers it not always to be of the same depth in its 



minimum. The light-curve is symmetrical. 



14. The alternate minima are thought by Roberts to be, to a very small 



extent, unequal, and to succeed each other at slightly different 

 interval'^. The light-curve is symmetrical. 



15. The light-curve is symmetrical, but it will be classified in the type 



of U Cephei, showing a flat minimum, lasting more than five 

 hours. 



16. Symmetrical light-curve showing a flat miniminn. 



17. The light-curve is almost symmetrical^ but exhibiting a slightly faster 



increase of light. 



19. The light-curve is not symmelrical, the increase of light being 



faster. 



20. The light-cnrve is almost symmetrical, still the increase of light 



being faster than the decrease. 

 22. By Graff, this star is suspected to be an Algol of a quite long period 

 but his further observations made this doubtful. 

 Taking all the literature on this star into consideration, I think 

 this is an Algol whose light-curve is not exactly similar in each 

 minimum. 



