Nonlinear pulsations of stars on the late asymptotic giant branch stage
Abstract
Based on consistent evolutionary and nonlinear stellar pulsation computations for population I stars with initial mass 1M⊙ , radial stellar oscillations on the late AGB stage between the last thermal pulse of the helium shell source and commencement of the post-AGB stage are investigated. During this evolutionary phase continuing for ≈ 7 × 10^4 the star is unstable against fundamental mode oscillations with period ranging within 40 day ≤ Γ ≤ 900 day. For ≈ 10^3 yr when the stellar luminosity is L > 4 × 10^3 L⊙ and the pulsation period is greater than ≈ 500 day nonlinear stellar pulsations lead to mass loss due to acceleration of outer layers to velocities greater than the escape velocity.
- Publication:
-
INASAN Science Reports
- Pub Date:
- October 2019
- DOI:
- 10.26087/INASAN.2019.3.1.025
- Bibcode:
- 2019INASR...3..162F