STUDIES IN STELLAR STATISTICS. II. 3 
there are 102 stars for which the apparent proper motion only, and 
not the radial velocity, is at present known, These 102 stars were 
first excluded from the investigation. The spectral type B is, in the 
classification of Harvard, divided into 10 subgroups! Bo, Bı,..., Bo, of 
which Bs and Bs stand on the limit to the spectral type A. Generally 
these later subgroups are considered to be more nearly correlated to 
type A than to type B. The 35 stars belonging to Bs and Bs were 
for this reason excluded. Moreover there are 6 stars of variable lumi- 
nosity which also could not be taken into account. The remaining 156 
stars are registered in the following table, obtained from the radial 
velocity catalogue of D:r GYLLENBERG. 
Table 1 Stars of the spectral Type D, brighter than 5", with known 
radial velocity (variables und types Bs, Bo are excluded), 
| | 1 
Square | B.P.C. | u | Y W | Magn. Sp. 
| I 
A, | 5532 +0%,004 | 407012 | —1597|| 385 | Ba 
B, 199 20.0291, .0.002 | 154 2.3 | Bp 
175 +.0.019 |. 0.021 — p 43 | Bs 
122 + 0.021 | — 0.009 - 0.28 3.7 | Be 
103 + 0.011 + 0.001 - 0.61 42 | Bo 
419 + 0.039 270.017 12.81 3.4 | Bs 
384 + 0.027 — 0.018 = 0.23 43 | Bp 
123 + 0.021 — 0.009 1410 5 45 | Bis 
B, 844 | + 0.010 -0.004 | 483.00 | 38 | B: 
894 + 0.013 — 0.017 340m EPR) Br 
1139 | + 0.007 | + 0.005 = Obits | dis Bo 
1003210 30.092 1.0.0388 | = 028) |, 4.9= | Bs 
780% 10.2.0025. | 0.090 | +0.78 | 4.9%) Bs 
B, 1204 | + 0.031 — 0.075 0282| 230) "Bis 
B, 3566 — 0.119 — 0.021 218 1:95 | Bi 
B, 4162 | — 0.012 + 0.030 — 3.82 | 39 | Bs 
B, | 4368 10.013 + 0.020 -401 | 32 | Bs 
4419 — 0.008 — 0.002 — 4.31 3.8 | Bs 
4897 0.000 | — 0.003 SES adu | 
B, SR 006 = 20:010: |) 2217.50. Pita 0 Bis 
5265 + 0.009 + 0.004 | — 7.67 49 | Bs 
4992 — 0.002 70.003. | 9595: 51 48 | Bs | 
5563 | + 0.005 + 0.002 = 3.55 |' 49 | Ba | 
! The subgroups B 4, B 6 and B 7 are only occasionally used in the Harvard catalogues. 
