Enhancement of Lithium in Red Clump Stars by the Additional Energy Loss Induced by New Physics

Abstract

Since 7Li is easily destroyed in low temperatures, the surface lithium abundance decreases as stars evolve. This is supported by the lithium depletion observed in the atmosphere of most red giants. However, recent studies show that almost all of red clump stars have high lithium abundances A(Li)>-0.9, which are not predicted by the standard theory of the low-mass stellar evolution. In order to reconcile the discrepancy between the observations and the model, we consider additional energy loss channels which may come from physics beyond the Standard Model. A(Li) slightly increases near the tip of the red giant branch even in the standard model with thermohaline mixing because of the 7Be production by the Cameron-Fowler mechanism, but the resultant 7Li abundance is much lower than the observed values. We find that the production of 7Be becomes more active if there are additional energy loss channels, because themohaline mixing becomes more efficient and a heavier helium core is formed.

arXiv comment8 pages, 11 figures, accepted by MNRAS

References in corpus (36)

• Evidence for oscillation of atmospheric neutrinos
• 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
• Low Temperature Opacities
• Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
• Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
• Revisiting the bound on axion-photon coupling from Globular Clusters
• The GALAH Survey: Second Data Release
• Thermohaline mixing: A physical mechanism governing the photospheric composition of low-mass giants
• The accretion of planets and brown dwarfs by giant stars -- II. solar mass stars on the red giant branch
• Standard and Non-Standard Plasma Neutrino Emission Revisited
• Axion and neutrino bounds improved with new calibrations of the tip of the red-giant branch using geometric distance determinations
• Period spacings in red giants II. Automated measurement
• Can Extra Mixing in RGB and AGB Stars Be Attributed to Magnetic Mechanisms?
• Particle-physics constraints from the globular cluster M5: Neutrino Dipole Moments
• On the Numerical Treatment and Dependence of Thermohaline Mixing in Red Giants
• Old puzzle, new insights: a lithium rich giant quietly burning helium in its core
• Discovery of ubiquitous lithium production in low-mass stars
• The nature of the Li enrichment in the most Li-rich giant star
• A large and pristine sample of standard candles across the Milky Way: ~100,000 red clump stars with 3% contamination
• Survey of Li-rich giants among Kepler and LAMOST fields: Determination of Li-rich giants Evolutionary Phase
• A helium-flash-induced mixing event can explain the lithium abundances of red clump stars
• Study of Lithium Rich Giants with the GALAH Spectroscopic Survey
• A super lithium-rich red-clump star in the open cluster Trumpler 5
• The role of lithium production in massive AGB and super--AGB stars for the understanding of multiple populations in Globular Clusters
• Lithium abundances along the RGB: FLAMES-GIRAFFE spectra of a large sample of low-mass Bulge stars
• The Impact of Neutrino Magnetic Moments on the Evolution of Massive Stars
• The Gaia-ESO Survey: properties of newly discovered Li-rich giants
• Is 6-Li in metal-poor halo stars produced in situ by solar-like flares?
• On Lithium-Rich Red Giants. II. Engulfment on the Giant Branch of Trumpler 20
• Stellar evolution and large extra dimensions
• Spectroscopic study of two new super Li rich red clump K giants
• Elimination of the Blue Loops in the Evolution of Intermediate-mass Stars by the Neutrino Magnetic Moment and Large Extra Dimensions

Cited by in corpus (23)

• Tracking the evolution of lithium in giants using asteroseismology: Super-Li-rich stars are almost exclusively young red-clump stars
• The Gaia-ESO survey: Lithium abundances in open cluster Red Clump stars
• Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy
• Neutrino Electromagnetic Properties
• Many Roads Lead to Lithium: Formation Pathways For Lithium-Rich Red Giants
• Mass Matters: No Evidence for Ubiquitous Lithium Production in Low-Mass Clump Giants
• Evidence of extra-mixing in field giants as traced by lithium and carbon isotope ratio
• Lithium Evolution of Giant Stars Observed by LAMOST and Kepler
• Li-rich Giants in LAMOST Survey. III. The statistical analysis of Li-rich giants
• Theoretical tools for neutrino scattering: interplay between lattice QCD, EFTs, nuclear physics, phenomenology, and neutrino event generators
• Li-rich and super Li-rich giants produced by element diffusion
• Probing infrared excess connection with Li enhancement among red clump giants
• Lithium in Kepler Red Giants: Defining Normal and Anomalous
• Implications on Cosmology from Dirac Neutrino Magnetic Moments
• Lithium abundances as a tracer of AGB stars pollution in the globular cluster NGC 6752
• Distribution and evolution of Li abundance in red clump stars can be explained by the internal gravity waves
• Progress in Nuclear Astrophysics of East and Southeast Asia
• Red-Giant Branch Stellar Cores as Macroscopic Dark Matter Detectors
• Convective Mixing: The Formation Channel of Li-rich Giants
• Discovery of a Metal-Poor Red Giant Star with the Highest Ultra-Lithium Enhancement
• Unevolved Li-rich stars at low metallicity: a possible formation pathway through novae
• The Impact of Neutrino Magnetic Moments on the Evolution of the Helium Flash and Lithium-Rich Red Clump Stars
• The Forward Physics Facility at the High-Luminosity LHC