Stars are opaque, so how can we work out their interior structure and the physical processes that are occurring inside them? Asteroseismology is the science of deducing stellar interiors from observations of a star’s surface oscillations. By monitoring a star’s tiny surface vibrations with a precision spectrograph, we can calculate that star's unique frequencies and modes of vibration, which are wholly governed by its interior structure. In this way, we can obtain tight constraints on the conditions within the star, which allows us to probe the relationship between the interior structure and the evolution of stars.
In this talk, I will describe our observing programme at the University of Canterbury’s Mt John Observatory, where we obtain extensive high-resolution echelle spectra of non-radially pulsating stars. We analyze these to obtain the pulsational frequencies and identify these with the multiple pulsational modes excited in the star. I will present a summary of our observational program and some recent results from our spectroscopic frequency and mode-identification analysis.