Post-asymptotic giant branch nonradial instability strips

Abstract

view Abstract Citations (49) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Post--Asymptotic Giant Branch Nonradial Instability Strips Stanghellini, Letizia ; Cox, Arthur N. ; Starrfield, Sumner Abstract Stability analyses are performed for nonradial g(+)-mode pulsations of postasymptotic AGB stellar models to determine the location of their pulsational instability strips in the Hertzsprung-Russell diagram. Stellar models are analyzed that are assumed to have undergone a major mass loss event either near the tip of the AGB or shortly thereafter and, therefore, consist of a 50-percent carbon 50-percent oxygen core. Their mass is 0.6 solar mass, which is in good agreement with the peak of the observed distribution of white dwarf masses. The results are compared both to the observed planetary nebula nuclei variables and the hot pulsating DO variables. An analysis is also presented of the stability of DB white dwarfs, which have much deeper and stronger convection zones, and an instability strip is found between about 18,000 and 26,000 K approximately as observed for the known variable stars. Publication: The Astrophysical Journal Pub Date: December 1991 DOI: 10.1086/170835 Bibcode: 1991ApJ...383..766S Keywords: Asymptotic Giant Branch Stars; Stellar Evolution; Stellar Models; Stellar Oscillations; White Dwarf Stars; Hertzsprung-Russell Diagram; Planetary Nebulae; Stellar Mass; Stellar Mass Ejection; Stellar Temperature; Variable Stars; Astrophysics; STARS: EVOLUTION; STARS: INTERIORS; STARS: PULSATION; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (10)