The Gaia-ESO Survey: properties of newly discovered Li-rich giants

@article{Smiljanic2018TheGS,
  title={The Gaia-ESO Survey: properties of newly discovered Li-rich giants},
  author={Rodolfo Smiljanic and E. Franciosini and Angela Bragaglia and Gra{\vz}ina Tautvai{\vs}ienė and Xiaoting Fu and Elena Pancino and Vardan Adibekyan and S{\'e}rgio G. Sousa and Sofia Randich and Josefina Montalb{\'a}n and Luca Pasquini and Laura Magrini and A. Drazdauskas and R. A. Garc{\'i}a and Savita Mathur and Beno{\^i}t Mosser and Clara R{\'e}gulo and R. de Assis Peralta and Saskia Hekker and Diane K. Feuillet and M. Valentini and Thierry Morel and Sarah L. Martell and Gerry Gilmore and Sofia Feltzing and Antonella Vallenari and Thomas Bensby and Andreas Korn and Alessandro C. Lanzafame and Alejandra Recio-Blanco and Amelia Bayo and Giovanni Carraro and M. T. Costado and Antonio Frasca and Paula Jofr{\'e} and Carmela Lardo and Patrick de Laverny and Karin Lind and Thomas Masseron and Lorenzo Monaco and Lorenzo Morbidelli and L. Prisinzano and Luca Sbordone and Simone Zaggia},
  journal={Astronomy \& Astrophysics},
  year={2018}
}
Aims. We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with an evolutionary stage confirmed by CoRoT (Convection, Rotation and planetary Transits) data. We present a detailed overview of the properties of these 20 stars. Methods. Atmospheric parameters and abundances were derived in model atmosphere analyses using medium-resolution GIRAFFE or high-resolution UVES (Ultraviolet and Visual Echelle Spectrograph) spectra. These results… 

High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST

The discovery of Li-rich giants has introduced a new challenge for standard stellar evolution models. To resolve this issue, the number of this type of object has been rapidly increased through the

Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase

In this Letter, we report the discovery of 24 new super Li-rich (A(Li) ≥ 3.2) giants of He-core burning phase at the red clump region. Results are based on a systematic search of a large sample of

Lithium-rich Giants in LAMOST Survey. I. The Catalog

Standard stellar evolution model predicts a severe depletion of lithium (Li) abundance during the first dredge up process (FDU). Yet a small fraction of giant stars are still found to preserve a

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

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

HD 150382: A Lithium-rich Star at the Early-AGB Stage?

We report the discovery of a lithium-rich giant, HD 150382, a post-red-giant-branch clump star. The atmospheric parameters, the chemical abundances for 17 elements, and the isotopic ratio 12C/13C

The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18

Context. Pismis 18 is a moderately populated, intermediate-age open cluster located within the solar circle at a Galactocentric distance of about seven kpc. Few open clusters have been studied in

Spectroscopic study of two new super Li-rich red clump K giants

In this paper, we report the discovery of two new super Li-rich K giants: HD~24960 and TYC~1751-1713-1. Based on high resolution ($R\approx 60,000$) spectroscopy, we have derived Li abundance of

Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant

Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert

Lithium and beryllium in the Gaia-Enceladus galaxy

Data from Gaia DR2 and The Apache Point Observatory Galactic Evolution Experiment surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a

Lithium Evolution of Giant Stars Observed by LAMOST and Kepler

Mapping lithium evolution for evolved stars will provide restrictions and constraints on the fundamental stellar interior physical processes, which will shed further light on our understanding of the

References

SHOWING 1-10 OF 167 REFERENCES

The Gaia-ESO Survey: revisiting the Li-rich giant problem

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during the Gaia-ESO Survey,

The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?

We report the discovery of two Li-rich giants, with A(Li) ~ 1.50, in an analysis of a sample of 40 giants of the open cluster Trumpler 20 (with turnoff mass ~1.8 M⊙). The cluster was observed in the

Gaia-ESO Survey: Analysis of pre-main sequence stellar spectra

Context. The Gaia-ESO Public Spectroscopic Survey is obtaining high-quality spectroscopy of some 100 000 Milky Way stars using the FLAMES spectrograph at the VLT, down to V = 19 mag, systematically

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 PUZZLING Li-RICH RED GIANT ASSOCIATED WITH NGC 6819

A Li-rich red giant (RG) star (2M19411367+4003382) recently discovered in the direction of NGC 6819 belongs to the rare subset of Li-rich stars that have not yet evolved to the luminosity bump, an

The Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and NGC 6705

Context. The Gaia-ESO Public Spectroscopic Survey will observe a large sample of clusters and cluster stars, covering a wide age-distance-metallicity-position-density parameter space. Aims. We aim to

The Gaia-ESO Survey: the origin and evolution of s-process elements

Context. Several works have found an increase of the abundances of the s-process neutron-capture elements in the youngest Galactic stellar populations. These trends provide important constraints on

The Gaia-ESO Survey: radial distribution of abundances in the Galactic disc from open clusters and young-field stars

Context. The spatial distribution of elemental abundances in the disc of our Galaxy gives insights both on its assembly process and subsequent evolution, and on the stellar nucleogenesis of the

HD 16771: A lithium-rich giant in the red-clump stage

Aims: We report the discovery of a young lithium rich giant, HD 16771, in the core-helium burning phase that does not seem to fit existing proposals of Li synthesis near the luminosity function bump

A new α-enhanced super-solar metallicity population

We performed a uniform and detailed analysis of 1112 high-resolution spectra of FGK dwarfs obtained with the HARPS spectrograph at the ESO 3.6 m telescope (La Silla, Chile). Most stars have effective
...