STUDIES IN STELLAR Starıstıcs. ll. 93 
The column under the heading of 2° gives the absolute paral- 
lax of the star (and its mean error) according to Kapteyn and based 
on the authority named in the next column. The last column gives 
the parallax of the star according to table 16 above. 
Taking into account the mean errors in the observed parallaxes 
the agreement with the computed parallaxes is good and may serve 
as a support of the values of À used in our investigations. 
24. Velocity of the B-stars. For those stars, for which the pro- 
per motions and the radial velocity are known, the velocity compo- 
nents may be calculated. Let u and v denote the proper motions in 
« (multiplied by cos 9) and 9 then we compute the reduced proper 
motions with the help of the formulæ 
Br Ir = N 
and the linear velocities perpendicular to the line of sight through 
U=Ru, V=Rv'. 
The three components U", V" and W" in the equatorialsystem 
of coordinates are now obtained from the formulæ 
igi = Yu UE 712 p 71a W c 
y" — ya Ud ya V ya W , 
Wen UT an V. te Ya WM s 
and the three components — U?, V?, W? — in the galactic system 
from 
y? = en U"+e, Pre wy" | 
yo = £j» (gr E Cop VA a es W" à 
VO = e200" enV" Ere y a 
I have given in table 1 a catalogue of 156 stars with known 
radial velocity and proper motions. All stars being brighter than the 
5" magnitude. For these stars! I have computed the components of 
the velocity in the galactie system through the formulae given above. 
The values of U?, V? and W? are given in the following table 
! Three stars in table 1 have been excluded because they do not belong to the 
subclasses here discussed. 
