Lithium and beryllium in solar twins

Meléndez, Jorge

doi:10.1002/asna.202013755

Cited by 2 publications

(1 citation statement)

References 68 publications

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“…Duncan & Jones 1983;Cayrel et al 1984;Sestito & Randich 2005;Anthony-Twarog et al 2018) and in solar-like stars with reliable age estimates (e.g. Carlos et al 2019;Meléndez 2020, and references therein).…”

Section: Looking For Stars That Might Preserve Their Original Surface LImentioning

confidence: 99%

The behaviour of lithium at high metallicity in the Milky Way

Charbonnel

Borisov

Laverny

et al. 2021

A&A

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Aims. We revisit large spectroscopic data sets for field stars from the literature to derive the upper Li envelope in the high metallicity regime in our Galaxy. Methods. We take advantage of Gaia EDR3 data and state-of-the-art stellar models to precisely determine the position of the sample dwarf stars in the Hertzsprung-Russell diagram. Results. The highest Li abundances are found in field metal-rich warm dwarfs from the GALAH survey, located on the hot side of the Li-dip. Their mean Li value agrees with what was recently derived for warm dwarfs in metal-rich clusters, pointing towards a continuous increase of Li up to super-solar metallicity. However, if only cool dwarfs are considered in GALAH, as done in the other literature surveys, it is found that the upper Li envelope decreases at super-solar metallicities, blurring the actual Li evolution picture. We confirm the suggestion that field and open cluster surveys that found opposite Li behaviour in the high metallicity regime do not sample the same types of stars: The first ones, with the exception of GALAH, miss warm dwarfs that can potentially preserve their original Li content. Conclusions. Although we can discard the bending of the Li upper envelope at high metallicity derived from the analysis of cool star samples, we still need to evaluate the effects of atomic diffusion on warm, metal-rich early-F and late-A type dwarfs before deriving the actual Li abundance at high metallicity.

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Section: Looking For Stars That Might Preserve Their Original Surface LImentioning

confidence: 99%

The behaviour of lithium at high metallicity in the Milky Way

Charbonnel

Borisov

Laverny

et al. 2021

A&A

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The evolution of lithium in FGK dwarf stars

de Andrés,

de la Reza,

Cruz

et al. 2024

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This work aims to investigate the behaviour of the lithium abundance in stars with and without detected planets. Our study is based on a sample of 1332 FGK main-sequence stars with measured lithium abundances, for 257 of which planets were detected. Our method reviews the sample statistics and is addressed specifically to the influence of tides and orbital decay, with special attention to planets on close orbits, whose stellar rotational velocity is higher than the orbital period of the planet. In this case, tidal effects are much more pronounced. The analysis also covers the orbital decay on a short timescale, with planets spiralling into their parent star. Furthermore, the sample allows us to study the relation between the presence of planets and the physical properties of their host stars, such as the chromospheric activity, metallicity, and lithium abundance. In the case of a strong tidal influence, we cannot infer from any of the studies described that the behaviour of Li differs between stars that host planets and those that do not. Our sample includes stars with super-solar metallicity ( Fe/H >0.15\,dex) and a low lithium abundance (A(Li) <1.0\,dex). This enabled us to analyse scenarios of the origin and existence of these stars. Considering the possible explanation of the F dip, we show that it is not a plausible scenario. Our analysis is based on a kinematic study and concludes that the possible time that elapsed in the travel from their birth places in the central regions of the Galaxy to their current positions in the solar neighbourhood is not enough to explain the high lithium depletion. It is remarkable that those of our high-metallicity low-lithium stars with the greatest eccentricity (e>0.2) are closest to the Galactic centre. A dedicated study of a set of high-metallicity low-Li stars is needed to test the migration-depletion scenario.

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Lithium and beryllium in solar twins

Cited by 2 publications

References 68 publications

The behaviour of lithium at high metallicity in the Milky Way

The behaviour of lithium at high metallicity in the Milky Way

The evolution of lithium in FGK dwarf stars

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