Distribution and evolution of Li abundance in red clump stars can be explained by the internal gravity waves
arXiv:2403.01056 · doi:10.3847/1538-4357/acae9d
Abstract
The study of Li phenomena in red clump (RC) stars can give us a deeper understanding of the structure and evolution of stars. \citet{2022ApJ...933...58C} explained the RC Li abundance distributions naturally using only standard post main sequence (MS) Li evolution models when the distribution of progenitor masses and the depletion of Li during the MS observed in MS stars were considered, thus neither extra Li depletion nor Li creation mechanism is required. Nevertheless, it is interesting to consider the effects of mixing caused by some extra mechanisms. By constructing different models, we find that the mixing caused by internal gravity waves can explain the observed Li abundances of RC stars with low mass progenitors. To explain that, we rely on the extra mixing induced by internal gravity waves that are excited at the bottom of the convective envelope at the red giant branch (RGB) stage. During the RGB stage, introducing the internal gravity waves can improve the diffusion coefficient and strengthen the mixing effect. The effective enrichment of Li occurs at the late RGB stage and requires the diffusion coefficient of H-burning shell to reach . Our models predict that the Li abundance decreases from to at the end of core He-burning stage, thereby revealing the of the observed Li abundance distribution. The thermohaline mixing regulates the Li abundance of RGB stars, which combines with the internal gravity waves can explain the Li abundances of most giants.
References in corpus (31)
- Modules for Experiments in Stellar Astrophysics (MESA)
- Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
- Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
- Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
- Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
- Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
- The GALAH Survey: Second Data Release
- The GALAH Survey: Observational Overview and Gaia DR1 companion
- WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
- Overview of the LAMOST survey in the first decade
- Tidal interactions between binary stars drives lithium production in low-mass red giants
- The K2-HERMES Survey: Age and Metallicity of the Thick Disc
- Old puzzle, new insights: a lithium rich giant quietly burning helium in its core
- Discovery of ubiquitous lithium production in low-mass stars
- Lithium-rich Giants in LAMOST Survey. I. The Catalog
- Most Lithium-rich Low-mass Evolved Stars Revealed as Red Clump stars by Asteroseismology and Spectroscopy
- Evolution of lithium in the Milky Way halo, discs and bulge
- Survey of Li-rich giants among Kepler and LAMOST fields: Determination of Li-rich giants Evolutionary Phase
- Solar models with convective overshoot, the solar-wind mass loss, and a PMS disk accretion: helioseismic quantities, Li depletion and neutrino fluxes
- The GALAH survey: A census of lithium-rich giant stars
- A helium-flash-induced mixing event can explain the lithium abundances of red clump stars
- The K2-HERMES Survey. I. Planet Candidate Properties from K2 Campaigns 1-3
- Li Evolution and the Open Cluster NGC 6819: A Correlation Between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip
- A k-omega model for stellar turbulent convection
- Enhancement of Lithium in Red Clump Stars by the Additional Energy Loss Induced by New Physics
- Two new Super Li-rich core He-burning giants: A new twist to the long tale of Li enhancement in K giants
- WIYN Open Cluster Study: The Old Open Cluster, NGC 188, and a Re-evaluation of Lithium-Richness Among Red Giants
- High-resolution spectroscopic analysis of a large sample of Li-rich giants found by LAMOST
- The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
- Mass Matters: No Evidence for Ubiquitous Lithium Production in Low-Mass Clump Giants
- Lithium Evolution of Giant Stars Observed by LAMOST and Kepler