EAN: 9783319666488

AMPLITUDE MODULATION OF PULSATION MODES IN DELT...

This outstanding thesis by Dominic Bowman provides a thorough investigation of long-standing
questions as to whether amplitude modulation is astrophysical  whether it offers insights into
pulsating stars  and whether simple beating of modes with stable amplitudes is unrecognised
because of a lack of frequency resolution. In this thesis  the author studied a uniform sample
of 983 delta Scuti stars-the most common type of main-sequence heat engine pulsator-that were
observed nearly continuously for 4 years at stunning photometric precision of only a few parts
per million by the Kepler space mission. With no mission planned to supersede the Kepler 4-year
data set  this thesis will stand as the definitive study of these questions for many years.
With revolutionary photometric data from the planet-hunting Kepler space mission  asteroseismic
studies have been carried out on many hundreds of main-sequence solar-type stars and about 10
000 red giants. It is easy to understand why those stochastically driven stars have highly
variable amplitudes. Over much of the rest of the Hertzsprung-Russell (HR) diagram  stellar
pulsations are driven by heat mechanisms  which are much more regular than the stochastic
driving in solar-like pulsators. Yet for decades  amplitude and frequency modulation of
pulsation modes have been observed in almost all types of heat-driven pulsating stars. The
author shows that the amplitude and frequency modulation are astrophysical  and he has
investigated their implications and prospects to provide new insights into the delta Scuti
stars and the many other types of heat-engine pulsators across the HR diagram.

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