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Radial-velocity Variations of Late-type Variables

Published online by Cambridge University Press:  12 April 2016

Stephenson L.S. Yang ,
Gordon A.H. Walker  and
Ana M. Larson
Stephenson L.S. Yang
Affiliation:
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
Gordon A.H. Walker
Affiliation:
Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada
Ana M. Larson
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA, USA

Abstract

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Low-amplitude, radial-velocity variations of bright late-type stars were monitored at the 1.2-m telescope of the Dominion Astrophysical Observatory (DAO) with the hydrogen fluoride (HF) absorption-cell technique. Many of the stars appear to be semi-regular red variables (SRb and SRc) and irregular red variables (Lb). The radial-velocity amplitudes range from a few tens of meters per second to a few kilometers per second while the timescales of the variations appear to range from a few tens of days to a few hundreds of days. These irregular-looking velocities are analysed for multiperiodicities. There are also variations in the chromospheric Ca II 8662 index for a few of the variables.

Type
Part 5. Variable Stars
Information
International Astronomical Union Colloquium , Volume 170: Precise Stellar Radial Velocities , 1999 , pp. 228 - 232
Copyright
Copyright © Astronomical Society of the Pacific 1999

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