A spectroscopic study of the open cluster M39.
Abstract
M39 is found to be intermediate among open clusters in its mean stellar rotational velocity and its frequency of binaries. A study of the 15 brightest members yielded orbital elements for four spectroscopic binaries; one other star has double lines. For six well-studied clusters there is a welldefined inverse correlation between mean rotational velocity and frequency of binaries with periods less than about 10 days; if longer-period binary motion is also effective in reducing rotational velocities, then the results imply preferential inclinations for some clusters. Subject headings: binaries - open clusters - rotation, stellar
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1973
- DOI:
- 10.1086/152486
- Bibcode:
- 1973ApJ...186..177A