Theory of Stellar Pulsation. (PSA-2)

The pulsation of Delta-Scuti stars

“…The periods encompass the same range, and increase for more evolved models, as noted by other authors. Growth rates are of the same order of magnitude, and are larger for the higher harmonics, as has been observed elsewhere (Cox 1980). …”

“…Indeed, later work (Epstein 1950, Cox 1955 showed that a variation in the nuclear energy generation rate in the stellar interior would produce an amplitude variation several orders of magnitude smaller than that at the surface.…”

“…More modern works include Cox (1980), which serves as a general' reference for the subsequent sections of this chapter.…”

“…6.6 THE CAUSE OF THE DRIVING Most pulsating stars are generally understood to be driven by an envelope ionisation mechanism (Cox 1980), with most driving due to the second helium ionisation zone, and a contribution from the hydrogen ionisation zone. The first helium ionisation zone is very near to the hydrogen zone, resulting in a combined (HI,HeI) zone.…”

Starquakes spring stellar surprises

“…There are three main textbooks on stellar pulsation -and now asteroseismology: the Theory of Stellar Pulsation (Cox 1980), Nonradial Oscillations of Stars (Unno et al 1989) and Asteroseismology (Aerts et al 2010). Most stars pulsate in global resonant modes, sometimes also termed starquakes.…”