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Amplitude Modulation of Pulsation Modes in Delta Scuti Stars (Hardcover, 1st ed. 2017)
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Amplitude Modulation of Pulsation Modes in Delta Scuti Stars (Hardcover, 1st ed. 2017)
Series: Springer Theses
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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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