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A survey for Doppler-shift oscillations in K giants

Published online by Cambridge University Press:  03 August 2017

Peter H. Smith ,
Robert S. McMillan  and
William J. Merline
Peter H. Smith
Affiliation:
Lunar and Planetary Laboratory University of Arizona Tucson, AZ, USA 85721
Robert S. McMillan
Affiliation:
Lunar and Planetary Laboratory University of Arizona Tucson, AZ, USA 85721
William J. Merline
Affiliation:
Lunar and Planetary Laboratory University of Arizona Tucson, AZ, USA 85721

Abstract

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A survey of K giants is being conducted to search for both short- and long-term oscillations. Our radial velocity spectrometer has a short-term precision on bright stars of 4 m/s after an exposure of 3 minutes on the CCD detector. Extensive sets of observations have been reduced for Arcturus, Pollux, and Aldebaran. Power spectra show no apparent oscillations within these data sets for frequencies between 0.15 and 2.0 mHz. However, the nightly averages over a 4 month time base show a three-fold increase in variance for Arcturus when compared to Pollux. A periodogram reveals a period of 1.844 0.005 days (or its alias of 2.174 days).

Type
Chapter 4: Asteroseismology: Results and Prospects
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 277 - 280
Copyright
Copyright © Reidel 1988 

References

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