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The Status of Early-Type Radial-Velocity Standards

Published online by Cambridge University Press:  12 April 2016

Francis C. Fekel
Francis C. Fekel*
Affiliation:
Center for Automated Space Science and Center of Excellence in Information Systems, Tennessee State University, 330 Tenth Avenue North, Nashville, Tennessee 37203

Abstract

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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 two dozen stars have been obtained with the KPNO coudé feed telescope, spectrograph, and a CCD detector. Mean velocities are given for 26 B and A stars plus HR 5447, an F2 V star. Unfortunately, most of the early and mid B-type stars have variable velocities. However, a number of slowly rotating, late B and A-type stars that have constant velocities are identified. From 53 velocities covering nearly 20 years, a preliminary orbit for the early-A star HR 8641 = o Peg has been determined. It has a period of 10.8 years and a total velocity amplitude of 2.4 km s−1.

Type
Part 9. Radial-Velocity Standards
Information
International Astronomical Union Colloquium , Volume 170: Precise Stellar Radial Velocities , 1999 , pp. 378 - 382
Copyright
Copyright © Astronomical Society of the Pacific 1999

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