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Asteroseismology from the main sequence to giant stars

Tarrant, Neil James (2010)
Ph.D. thesis, University of Birmingham.

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Abstract

The thesis focuses on the use of asteroseismology to probe the structure of stellar sources. By observing pulsational variability, a detailed description of the interior of stars, and the determination of stellar parameters can be obtained. An extensive sample of bright K and M class giant stars were surveyed to detect the presence of any noticeable variability. Three giant stars have been studied in detail. In Arcturus (alpha Boo), no oscillations at a significant amplitude were detected. In beta UMi (Kochab) multiperiodic oscillations have been observed for the first time, allowing an asteroseismic estimate for the mass. In gamma Crucis (Gacrux) previously observed frequencies have been confirmed, and the modes shown to be sinusoidal in nature. Two main-sequence stars have been studied in detail. In the first, gamma Dor, prototype star of the class of gamma Doradus variable stars, three oscillations further to those previously known were unambiguously detected in the star. In the second, nu Eri, a beta Cephei class variable star, modes detected by an extensive previous campaign were confirmed, with determined frequencies in excellent agreement between the two studies. All results gathered should provide a valuable input to future models of these stars, and provide an interesting starting point for further, detailed studies.

Type of Work:Ph.D. thesis.
Supervisor(s):Chaplin, William J. and Elsworth, Yvonne
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Additional Information:

Two papers based on this thesis, and originally included in Appendix 2 are available at http://eprints.bham.ac.uk/380/ http://eprints.bham.ac.uk/38/

Subjects:QB Astronomy
Institution:University of Birmingham
Copyright Holders:Neil J Tarrant
ID Code:736
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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