Paper:	Radial-Velocity Variations of Late-Type Variables
Volume:	185, Precise Stellar Radial Velocities, IAU Colloquium 170
Page:	228
Authors:	Yang, S. L. S.; Walker, G. A. H.; Larson, A. M.
Abstract:	Low-amplitude, radial-velocity variations of bright late-type stars are monitored at the 1.22-m telescope of the Dominion Astrophysical Observatory (DAO) with the hydrogen fluoride (HF) absorption-cell technique, and more recently with the telluric-line 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 metres per second to a few kilometres 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.

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