Metallicity and age effects on lithium depletion in solar analogues
arXiv:2305.01861 · doi:10.1093/mnras/stad1177
Abstract
The lithium present in the photospheres of solar-type stars is transported to the inner parts by convection, reaching regions even somewhat below the convection zone, by non-standard transport mechanisms. In stars with deeper convective zones, this element can reach regions with temperatures sufficient enough to be destroyed, implying in a lower Li content. More metallic stars show a deepening of their convective zones, so they could deplete more Li in comparison with stars of lower metallicity. In order to verify this effect and its amplitude, we selected stars with ~1 M and metallicities within a factor of two relative to the Sun. We studied a sample of 41 metal-rich and -poor solar analogues, and carried out a joint analysis with a sample of 77 solar twins from our previous work, resulting in a total sample of 118 stars covering the metallicity range -0.3 [Fe/H] +0.3 dex. We employed high-resolution (R = 115 000) and high-signal-to-noise ratio (S/N = 400-1000) HARPS spectra and determined the atmospheric parameters using a line-by-line differential analysis and the Li abundance through spectral synthesis. The ages and masses of the whole sample were improved by refining the isochronal method. We also investigated the impact of planets on Li. We found robust anticorrelations between Li abundance and both metallicity and age, with a significance above 10 in both cases. Our results agree qualitatively with theoretical predictions and are useful to constrain non-standard models of Li depletion, and to better understand transport and mixing mechanisms inside stars.
10 pages, 5 figures, 2 tables
References in corpus (19)
- Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
- WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
- Older and Colder: The impact of starspots on pre-main sequence stellar evolution
- Stellar Chemical Abundances: In Pursuit of the Highest Achievable Precision
- 18 Sco: a solar twin rich in refractory and neutron-capture elements. Implications for chemical tagging
- The temporal evolution of neutron-capture elements in the Galactic discs
- The Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars
- The Li-age correlation: the Sun is unusually Li deficient for its age
- Lithium depletion in solar-like stars: effect of overshooting based on realistic multi-dimensional simulations
- Chemical evidence for planetary ingestion in a quarter of Sun-like stars
- Lithium Abundances in a Sample of Planet Hosting Dwarfs
- The Solar Twin Planet Search. V. Close-in, low-mass planet candidates and evidence of planet accretion in the solar twin HIP 68468
- Lithium depletion and angular momentum transport in solar-type stars
- Light Elements in the Universe
- HIP 114328: a new refractory-poor and Li-poor solar twin
- Lithium abundances in exoplanet-host stars : modelling
- Shallow extra mixing in solar twins inferred from Be abundances
- Gaia-ESO Survey: Role of magnetic activity and starspots on pre-main sequence lithium evolution
- Lithium depletion and angular momentum transport in F-type and G-type stars in Galactic open clusters