Reinvestigation of certain long-period A-type binaries.
Abstract
The published orbital elements of 16 normal late A-type stars have been reinvestigated with new radial velocities. For small-amplitude systems, we do not confirm the published orbital elements that were derived by combining velocities from various observatories. New or confirmed elements are given for several systems. There is no longer any convincing evidence for secondary stars (or black holes) having masses greater than those of their primaries. We continue to find no short-period (<300 days) binaries, such as are common among the Am stars, in this sample of normal late A-type stars, although a few nearly-contact systems outside this sample need further investigation. Subject headings: binaries - early-type stars
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1974
- DOI:
- 10.1086/152716
- Bibcode:
- 1974ApJ...188..291A