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The HF Precise Radial Velocity Programme at DAO

Published online by Cambridge University Press:  15 February 2018

S. Yang ,
A. Larson ,
A.W. Irwin ,
C. Goodenough ,
G.A.H. Walker ,
A. Walker  and
D. Bohlender
S. Yang
Affiliation:
University of Victoria, Canada
A. Larson
Affiliation:
University of Victoria, Canada
A.W. Irwin
Affiliation:
University of Victoria, Canada
C. Goodenough
Affiliation:
University of Victoria, Canada
G.A.H. Walker
Affiliation:
University of British Columbia, Canada
A. Walker
Affiliation:
University of British Columbia, Canada
D. Bohlender
Affiliation:
University of British Columbia, Canada

Abstract

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A programme to measure precise radial velocities of late-type stars is being carried out at the 1.22-m telescope of the Dominion Astrophysical Observatory (DAO). Wavelength-calibration fiducials are imposed directly on the stellar spectra by passing the starlight through a controlled hydrogen fluoride (HF) absorption cell placed in front of the coude spectrograph. Presently, the primary targets of the programme are bright G, K, and M giants. Preliminary results confirm the low-amplitude, radial-velocity (RV) variability of the yellow giants discovered at the Canada-Prance-Hawaii telescope using the HF technique. These yellow giants and additional bright candidates are now being continually monitored at DAO. Preliminary results also indicate that the “yellow giant” variability extends to the early-M giants. In addition to the RV variations, the data also yield information on the simultaneous variability of the Ca II λ8662 line, Teff, as well as the R - I index of the stars.

Type
Windows on the Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 383
Copyright
Copyright © Cambridge University Press 1993

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