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The Gaia -ESO Survey : Lithium measurements and new curves of growth

Franciosini, E. ; Randich, S. ; De Laverny, P. ; Biazzo, K. ; Feuillet, D. K. LU orcid ; Frasca, A. ; Lind, K. ; Prisinzano, L. ; Tautvaišiene, G. and Lanzafame, A. C. , et al. (2022) In Astronomy and Astrophysics 668.
Abstract

Context. The Gaia-ESO Survey (GES) is a large public spectroscopic survey that was carried out using the multi-object FLAMES spectrograph at the Very Large Telescope. The survey provides accurate radial velocities, stellar parameters, and elemental abundances for ~115 000 stars in all Milky Way components. Aims. In this paper, we describe the method adopted in the final data release to derive lithium equivalent widths (EWs) and abundances. Methods. Lithium EWs were measured using two different approaches for FGK and M-type stars, to account for the intrinsic differences in the spectra. For FGK stars, we fitted the lithium line using Gaussian components, while direct integration over a predefined interval was adopted for M-type stars.... (More)

Context. The Gaia-ESO Survey (GES) is a large public spectroscopic survey that was carried out using the multi-object FLAMES spectrograph at the Very Large Telescope. The survey provides accurate radial velocities, stellar parameters, and elemental abundances for ~115 000 stars in all Milky Way components. Aims. In this paper, we describe the method adopted in the final data release to derive lithium equivalent widths (EWs) and abundances. Methods. Lithium EWs were measured using two different approaches for FGK and M-type stars, to account for the intrinsic differences in the spectra. For FGK stars, we fitted the lithium line using Gaussian components, while direct integration over a predefined interval was adopted for M-type stars. Care was taken to ensure continuity between the two regimes. Abundances were derived using a new set of homogeneous curves of growth that were derived specifically for GES, and which were measured on a synthetic spectral grid consistently with the way the EWs were measured. The derived abundances were validated by comparison with those measured by other analysis groups using different methods. Results. Lithium EWs were measured for ~40 000 stars, and abundances could be derived for ~38 000 of them. The vast majority of the measures (80%) have been obtained for stars in open cluster fields. The remaining objects are stars in globular clusters, or field stars in the Milky Way disc, bulge, and halo. Conclusions. The GES dataset of homogeneous lithium abundances described here will be valuable for our understanding of several processes, from stellar evolution and internal mixing in stars at different evolutionary stages to Galactic evolution.

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type
Contribution to journal
publication status
published
subject
keywords
Methods: data analysis, Stars: abundances, Stars: late-type, Surveys
in
Astronomy and Astrophysics
volume
668
article number
A49
publisher
EDP Sciences
external identifiers
  • scopus:85145351187
ISSN
0004-6361
DOI
10.1051/0004-6361/202244854
language
English
LU publication?
yes
id
978ec0a5-cd99-4bad-b102-acdec7ec258f
date added to LUP
2023-01-16 16:26:53
date last changed
2024-04-17 21:35:57
@article{978ec0a5-cd99-4bad-b102-acdec7ec258f,
  abstract     = {{<p>Context. The Gaia-ESO Survey (GES) is a large public spectroscopic survey that was carried out using the multi-object FLAMES spectrograph at the Very Large Telescope. The survey provides accurate radial velocities, stellar parameters, and elemental abundances for ~115 000 stars in all Milky Way components. Aims. In this paper, we describe the method adopted in the final data release to derive lithium equivalent widths (EWs) and abundances. Methods. Lithium EWs were measured using two different approaches for FGK and M-type stars, to account for the intrinsic differences in the spectra. For FGK stars, we fitted the lithium line using Gaussian components, while direct integration over a predefined interval was adopted for M-type stars. Care was taken to ensure continuity between the two regimes. Abundances were derived using a new set of homogeneous curves of growth that were derived specifically for GES, and which were measured on a synthetic spectral grid consistently with the way the EWs were measured. The derived abundances were validated by comparison with those measured by other analysis groups using different methods. Results. Lithium EWs were measured for ~40 000 stars, and abundances could be derived for ~38 000 of them. The vast majority of the measures (80%) have been obtained for stars in open cluster fields. The remaining objects are stars in globular clusters, or field stars in the Milky Way disc, bulge, and halo. Conclusions. The GES dataset of homogeneous lithium abundances described here will be valuable for our understanding of several processes, from stellar evolution and internal mixing in stars at different evolutionary stages to Galactic evolution.</p>}},
  author       = {{Franciosini, E. and Randich, S. and De Laverny, P. and Biazzo, K. and Feuillet, D. K. and Frasca, A. and Lind, K. and Prisinzano, L. and Tautvaišiene, G. and Lanzafame, A. C. and Smiljanic, R. and Gonneau, A. and Magrini, L. and Pancino, E. and Guiglion, G. and Sacco, G. G. and Sanna, N. and Gilmore, G. and Bonifacio, P. and Jeffries, R. D. and Micela, G. and Prusti, T. and Alfaro, E. J. and Bensby, T. and Bragaglia, A. and François, P. and Korn, A. J. and Van Eck, S. and Bayo, A. and Bergemann, M. and Carraro, G. and Heiter, U. and Hourihane, A. and Jofré, P. and Lewis, J. and Martayan, C. and Monaco, L. and Morbidelli, L. and Worley, C. C. and Zaggia, S.}},
  issn         = {{0004-6361}},
  keywords     = {{Methods: data analysis; Stars: abundances; Stars: late-type; Surveys}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{The Gaia -ESO Survey : Lithium measurements and new curves of growth}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202244854}},
  doi          = {{10.1051/0004-6361/202244854}},
  volume       = {{668}},
  year         = {{2022}},
}