The epsilon-mechanism in PMS and MS delta Scuti stars

in Communications in Asteroseismology (2006), 147

Delta Scuti type stars are known to pulsate in nonradial low-order p and g modes. These oscillation modes are driven by the so-called kappa-mechanism involving the second helium ionization zone. However ... [more ▼]

Delta Scuti type stars are known to pulsate in nonradial low-order p and g modes. These oscillation modes are driven by the so-called kappa-mechanism involving the second helium ionization zone. However, since g modes have significant amplitudes near the stellar core, their excitation might be influenced by the epsilon-mechanism which is associated to the nuclear energy production. We investigate the effect of the epsilon-mechanism on the stability of oscillation modes in 1.5 M(solar) pre-main sequence and main sequence stars. [less ▲]