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Spectroscopic mode identification of γ Doradus stars: frequencies, modes, rotation and wave leakage

Published online by Cambridge University Press:  27 October 2016

Karen R. Pollard ,
E. Brunsden ,
M. Davie ,
A. Greenwood  and
P. L. Cottrell
Karen R. Pollard
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand email: karen.pollard@canterbury.ac.nz
E. Brunsden
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand email: karen.pollard@canterbury.ac.nz Department of Physics, University of York, York, United Kingdom
M. Davie
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand email: karen.pollard@canterbury.ac.nz Department of Astrophysics, University of New South Wales, Sydney, Australia
A. Greenwood
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand email: karen.pollard@canterbury.ac.nz Department of Astronomy, University of Groningen, Groningen, The Netherlands
P. L. Cottrell
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand email: karen.pollard@canterbury.ac.nz University of Canterbury International College, Christchurch, New Zealand
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Abstract

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The gravity modes present in γ Doradus stars probe the deep stellar interiors and are thus of particular interest in asteroseismology. The MUSICIAN programme at the University of Canterbury has been successfully identifying frequencies and pulsation modes in many γ Doradus stars using hundreds of precise, high resolution spectroscopic observations obtained with the 1.0 m telescope and HERCULES spectrograph at the Mt John Observatory in New Zealand. In this paper we present a summary of our spectroscopic frequency and mode identifications. Of particular interest from our spectroscopic analyses are: the prevalence of (ℓ, m) = 1, 1 modes in many γ Dor stars; the importance of stellar rotation in the interpretation of the frequency and mode identification; and finally, possible evidence of wave leakage in one of these stars.

Keywords

stars: oscillations (including pulsations)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 509 - 513
Copyright
Copyright © International Astronomical Union 2016 

References

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