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Short Period Oscillations in Acturus, Aldebaran, and Pollux

Published online by Cambridge University Press:  19 July 2016

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

Abstract

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A total of 48 nights of time series data have been obtained for the K giants: Arcturus, Pollux, and Aldebaran. A careful analysis of both single and multi–night sets using the earth's motion as a velocity calibrator has yielded stellar velocity time series accurate to ± 3 m/s per observation. Periodogram analyses of these sets have revealed the existence of oscillations with periods near 2.5 hrs and amplitudes of ± 5 m/s for both Pollux and Aldebaran, but not for Arcturus. Preliminary analysis of a 5-night set for Pollux using the CLEAN algorithm suggests at least three modes separated by about 35 microHertz.

Type
IV. Spectroscopic Patterns of Stellar Atmospheres
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 291 - 294
Copyright
Copyright © Kluwer 1988 

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