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| Paper: |
The Status of Early-Type Radial-Velocity Standards |
| Volume: |
185, Precise Stellar Radial Velocities, IAU Colloquium 170 |
| Page: |
378 |
| Authors: |
Fekel, F. C. |
| Abstract: |
A search for constant velocity B and A stars for use as early-type radial-velocity standards has continued for 15 years. For the past decade observations of over 30 stars have been obtained with the KPNO coude feed telescope, spectrograph, and CCD detectors. The results show that most of the early and mid B-type stars have variable velocities. However, a number of slowly rotating, late B and A-type stars having constant velocity have been identified. A couple of these have velocity ranges of several hundred m/s. From 50 velocities covering nearly 20 years, a preliminary orbit for the early-A star HR 8641 had been determined. It has a period of 10.8 years and a total velocity amplitude of 2.4 km/s. |
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