Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era

@article{Charbonnel2020LithiumIR,
  title={Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era},
  author={Corinne Charbonnel and Nad{\`e}ge Lagarde and G{\'e}rard Jasniewicz and Pierre L. North and Matthew D. Shetrone and Julie K. Hollek and Verne V. Smith and Rodolfo Smiljanic and Ana Palacios and Gael Ottoni},
  journal={Astronomy \& Astrophysics},
  year={2020}
}
Context. Li is extensively known to be a good tracer of non-standard mixing processes occurring in stellar interiors. Aims. We present the results of a new large Li survey in red giant stars and combine it with surveys from the literature to probe the impact of rotation-induced mixing and thermohaline double-diffusive instability along stellar evolution. Methods. We determined the surface Li abundance for a sample of 829 giant stars with accurate Gaia parallaxes for a large sub-sample (810… 
The evolution of Lithium: implications of a universal Spite plateau
The cosmological 7Li problem consists in explaining why the primordial Li abundance, as predicted by the standard Big Bang nucleosynthesis theory with constraints from WMAP and Planck, is a factor of
Li-rich giant stars under scrutiny: binarity, magnetic activity, and the evolutionary status after Gaia DR2
We present a study of the evolutionary state of a few lithium-rich giant stars based on the Gaia DR2 parallaxes and photometry. We also investigate the chromospheric activity, the presence of a
Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy
Lithium has confused scientists for decades at almost every scale of the universe. Lithium-rich giants are peculiar stars with lithium abundances greater than model prediction. A large fraction of
Abundance–age relations with red clump stars in open clusters
Context. Precise chemical abundances coupled with reliable ages are key ingredients to understanding the chemical history of our Galaxy. Open clusters (OCs) are useful for this purpose because they
Light Elements in the Universe
Due to their production sites, as well as to how they are processed and destroyed in stars, the light elements are excellent tools to investigate a number of crucial issues in modern astrophysics:
First star survivors as metal-rich halo stars that experienced supernova explosions in binary systems
The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars and galaxies, the
Lithium in T Coronae Borealis
T Coronae Borealis is a recurrent, symbiotic nova system currently in quiescence between its periodic ≈80 yr cycle of eruptions. Observations during inter-outburst epochs provide an opportunity to
Li-rich K giants, dust excess, and binarity
The origin of the Li-rich K giants is still highly debated. Here, we investigate the incidence of binarity among this family from a nine-year radial-velocity monitoring of a sample of 11 Li-rich K
LAMOST/HRS spectroscopic analysis of two new Li-rich giants
Two Li-rich candidates, TYC 1338–1410–1 and TYC 2825–596–1, were observed by the new high-resolution echelle spectrograph, LAMOST/HRS. Based on their high-resolution and high-signal-to-noise ratio
Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer
We measured the angular diameters of 44 stars with the Navy Precision Optical Interferometer, obtaining uncertainties on the limb-darkened diameter of 2% or less for all but four stars. We then used
...
...

References

SHOWING 1-10 OF 134 REFERENCES
The Gaia -ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc
Lithium abundance in most of the warm metal-poor main sequence stars shows a constarnt plateau (A(Li) ~ 2.2 dex) and then the upper envelope of the lithium vs. metallicity distribution increases as
Li-rich red giant branch stars in the Galactic bulge
Aims. We present Lithium abundance determination for a sample of K giant stars in the galactic bulge. The stars presented here a re the only 13 stars with detectable Lithium line (6767.18A) among∼400
Lithium abundances along the RGB: FLAMES-GIRAFFE spectra of a large sample of low-mass Bulge stars
Context: A small number of K-type giants on the red giant branch (RGB) is known to be very rich in lithium (Li). This fact is not accounted for by standard stellar evolution theory. The exact phase
Lithium-rich giants in the Galactic thick disk
Context. Lithium is a fragile element, which is easily destroyed in the stellar interior. The existence of lithium-rich giants still represents a challenge for stellar evolution models. Aims. We have
The Gaia-ESO Survey: impact of extra mixing on C and N abundances of giant stars
Context. The Gaia-ESO Public Spectroscopic Survey using FLAMES at the VLT has obtained high-resolution UVES spectra for a large number of giant stars, allowing a determination of the abundances of
Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction, Galactic chemical evolution, and exoplanets
We derive atmospheric parameters and lithium abundances for 671 stars and include our measurements in a literature compilation of 1381 dwarf and subgiant stars. First, a “lithium desert” in the
Signatures of intrinsic Li depletion and Li-Na anti-correlation in the metal-poor globular cluster NGC 6397 ,
Context. To alleviate the discrepancy between the prediction of the primordial lithium abundance in the universe and the abundances observed in Pop II dwarfs and subgiant stars, it has been suggested
Searching for Li-rich giants in a sample of 12 open clusters: Li enhancement in two stars with substellar companions
The aim of this work is to search for Li-rich giants in a sample of clusters where planets have been searched, thus we can study the planet engulfment scenario to explain Li replenishment using a
The Lithium Abundances of a Large Sample of Red Giants
The lithium abundances for 378 G/K giants are derived with non-local thermodynamic equilibrium correction considered. Among these are 23 stars that host planetary systems. The lithium abundance is
Li abundances in F stars: planets, rotation, and Galactic evolution
Aims. We aim, on the one hand, to study the possible differences of Li abundances between planet hosts and stars without detected planets at effective temperatures hotter than the Sun, and on the
...
...