The Impact of the Third Dredge-up and Mass Loss in Shaping the Initial-Final Mass Relation of White Dwarfs
The Astrophysical Journal(2024)
摘要
The initial-final mass relation (IFMR) plays a crucial role in understanding
stellar structure and evolution by linking a star's initial mass to the mass of
the resulting white dwarf. This study explores the IFMR in the initial mass
range 0.8 ≤ M_ini / M_⊙≤ 4 using full PARSEC evolutionary
calculations supplemented with COLIBRI computations to complete the ejection of
the envelope and obtain the final core mass. Recent works have shown that the
supposed monotonicity of the IFMR is interrupted by a kink in the initial mass
range M_ini≈ 1.65-2.10 M_⊙, due to the interaction
between recurrent dredge-up episodes and stellar winds in carbon stars evolving
on the thermally-pulsing asymptotic giant branch phase. To reproduce the IFMR
non-monotonic behavior we investigate the role of convective overshooting
efficiency applied to the base of the convective envelope (f_env)
and to the borders of the pulse-driven convective zone (f_pdcz), as
well as its interplay with mass loss. We compare our models to observational
data and find that f_env must vary with initial mass in order to
accurately reproduce the IFMR's observed kink and slopes. We find some
degeneracy between the overshooting parameters when only the IFMR information
is used. Nonetheless, this analysis provides valuable insights into the
internal mixing processes during the TP-AGB phase.
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关键词
Asymptotic giant branch stars,Carbon stars,White dwarf stars,Stellar winds,Stellar convective zones
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