Convective settling in main sequence stars: Li and Be depletion

Abstract

The process of convective settling is based on the assumption that a small fraction of the low-entropy downflows sink from the photosphere down to the bottom of the star's envelope convection zone retaining a substantial entropy contrast. We have previously shown that this process could explain the slow Li depletion observed in the Sun. We construct a parametric model of convective settling to investigate the dependence of Li and Be depletion on stellar mass and age. Our model is generally in good agreement with the Li abundances measured in open clusters and solar twins, although it seems to underestimate the Li depletion in the first ~1 Gyr. The model is also compatible with the Be abundances measured in a sample of field stars.

8 pages, 9 figures, accepted for publication in A&A

References in corpus (4)

• Identifying the Low Luminosity Population of Embedded Protostars in the c2d Observations of Clouds and Cores
• Improvements to stellar structure models, based on a grid of 3D convection simulations. II. Calibrating the mixing-length formulation
• Rotation, inflation, and lithium in the Pleiades
• HIP 114328: a new refractory-poor and Li-poor solar twin

Cited by in corpus (13)

• Grid Search in Stellar Parameters: a software for spectrum analysis of single stars and binary systems
• Correlation between lithium abundances and ages of solar twin stars
• Planet signatures and effect of the chemical evolution of the Galactic thin-disk stars
• High precision analysis of the solar twin HIP 100963
• Behaviour of elements from lithium to europium in stars with and without planets
• Metallicity and age effects on lithium depletion in solar analogues
• Evolution of lithium abundance in the Sun and solar twins
• Lithium depletion in solar analogs: age and mass effects
• Addressing the acoustic tachocline anomaly and the lithium depletion problem at the same time
• The AMBRE Project: searching for the closest solar siblings
• A GALAH View of the Chemical Homogeneity and Ages of Stellar Strings Identified in Gaia
• Testing a non-local 1-equation turbulent convection model: A solar model
• Suppression of lithium depletion in young low-mass stars from fast rotation