The Radial Velocities of the Pleiades.
Abstract
The radial velocities of 71 stars have been determined from 237 spectrograms. Sixty-nine stars are regarded as members of the cluster. The mean velocity for all 69 stars is +4.08 ± 0.68 (me.) km/sec. If the stars are divided into two groups, according to rotational velocity, 50 of low rotation give +5.19 ± 0.70, while 19 of high rotation give + 1.17 ± 1.41 km/sec. No explanation is offered for this systematic difference. The largest range in velocity for any star is 54 km/sec (No. 13). This star and No. 33, having a range of 45 km/sec, are regarded as spectroscopic binaries, while 8 other stars are suspected. The ques- tions of internal motions and of spatial differences in the velocities are briefly discussed
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1944
- DOI:
- 10.1086/144677
- Bibcode:
- 1944ApJ...100..360S