264 CARNEGIE INSTITUTION OF WASHINGTON. 



4. Stars suspected of belonging to the Taurus group. 



5. Miscellaneous lists including: A-type stars of especially small 

 proper motion; M-type stars of large and of small proper motion, the 

 spectra of which have been obtained for comparison with one another; 

 the brighter stars in Kapteyn's Selected Areas; and a few stars of espe- 

 cial individual interest, such as Nova Geminorum No. 2, Kruger 60, 

 and some other stars of very small absolute luminosity. 



The total number of photographs obtained during the year is 980, 

 distributed as follows: 



Small proper-motion stars, types A to Mc 620 



Parallax and large proper-motion stars 237 



Perseus group 8 



Taurus group 18 



Miscellaneous A and B type stars 22 



Absorption of light in space photographs 34 



MisceOaneous 41 



By far the larger part of the photographs have been taken with the 

 46-cm. camera and one prism. This low dispersion is necessary in the 

 case of the majority of the parallax stars on account of their faintness, 

 and since the spectra of the small proper-motion stars are compared with 

 those of the parallax stars in several of the investigations, it has seemed 

 best to obtain both spectra on the same scale. Photographs with the 

 102-cm. camera have supplemented the smaller-scale negatives in the 

 case of some of the brighter stars. A few experiments have been made 

 recently with a 39° prism and the 46-cm. camera on some stars in our 

 lists fainter than the ninth magnitude, with results which will probably 

 warrant the use of this arrangement where higher dispersion can not 

 be employed. 



The results of the stellar spectroscopic work during the year may be 

 considered under three heads: first, radial velocity; second, absorption 

 of light in space; third, spectral criteria of absolute magnitude. 



Radial Velocities. 



The total number of stars with radial velocities determined from 

 three or more observations so far obtained is as follows : 



A, B, and Oe stars 289 



Stars with measured parallaxes 147 



Small proper-motion stars, F to Mc 96 



Miscellaneous 13 



Spectroscopic binaries 115 



During the year the results have been published for 100 of the paral- 

 lax stars. These are among those nearest to the earth and for the most 

 part are of small intrinsic brightness and probably of small mass as 

 well. Their velocities accordingly are of especial interest. Among the 

 results found are the following: 



Twenty stars have radial velocities exceeding 50 km. after being 

 corrected for the sun's motion in space. Five of these velocities are 



