Stellar pulsation: excitation, diagnosis and seismology

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• Simon Jeffery, Armagh Observatory and Planetarium
• Monday 25 February 2019, 14:00-15:00
• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Cleo Loi.

Pulsations in stars across the Hertzsprung-Russell diagram are caused by the excitation of normal modes of oscillation by various means. The classical opacity (or kappa-gamma) mechanism responsible for the well-known Cepheid variables relies on peaks in the internal opacity – temperature distribution in a star. Starting from both linear and non-linear models, we will discuss the internal stellar chemistries that lead such peaks to produce pulsations in many classes of evolved star. We will explore one star in particular, V652 Her, where high-precision observations of large amplitude pulsations can be directly compared with hydrodynamic models, and we shall demonstrate how pulsations studies can reveal a star’s hidden past.

This talk is part of the DAMTP Astrophysics Seminars series.

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