J/A+A/653/A72 Stellar parameters and Li abundances from GES iDR6 (Romano+, 2021)
The Gaia-ESO Survey: Galactic evolution of lithium from iDR6.
Romano D., Magrini L., Randich S., Casali G., Bonifacio P.,
Jeffries R. D., Matteucci F., Franciosini E., Spina L., Guiglion G.,
Chiappini C., Mucciarelli A., Ventura P., Grisoni V., Bellazzini M.,
Bensby T., Bragaglia A., de Laverny P., Korn A. J., Martell S. L.,
Tautvaisiene G., Carraro G., Gonneau A., Jofre P., Pancino E.,
Smiljanic R., Vallenari A., Fu X., Gutierrez Albarran M. L.,
Jimenez-Esteban F. M., Montes D., Damiani F., Bergemann M., Worley C.
<Astron. Astrophys. 653, A72 (2021)>
=2021A&A...653A..72R 2021A&A...653A..72R (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Abundances
Keywords: Galaxy: abundances - Galaxy: evolution - Galaxy: stellar content -
stars: abundances - open clusters and associations: general -
nuclear reactions, nucleosynthesis, abundances
Abstract:
After more than 50 years, astronomical research still struggles to
reconstruct the history of lithium enrichment in the Galaxy and to
establish the relative importance of the various 7Li sources in
enriching the interstellar medium (ISM) with this fragile element.
To better trace the evolution of lithium in the Milky Way discs, we
exploit the unique characteristics of a sample of open clusters (OCs)
and field stars for which high-precision 7Li abundances and stellar
parameters are homogeneously derived by the Gaia-ESO Survey (GES).
We derive possibly un-depleted 7Li abundances for 26 OCs and star
forming regions with ages from young (∼3Myr) to old (∼4.5Gyr),
spanning a large range of galactocentric distances, 5<RGC/kpc<15,
which allows us to reconstruct the local late Galactic evolution of
lithium as well as its current abundance gradient along the disc.
Field stars are added to look further back in time and to constrain
7Li evolution in other Galactic components. The data are then compared
to theoretical tracks from chemical evolution models that implement
different 7Li forges.
Thanks to the homogeneity of the GES analysis, we can combine the
maximum average 7Li abundances derived for the clusters with 7Li
measurements in field stars. We find that the upper envelope of the
7Li abundances measured in field stars of nearly solar metallicities
(-0.3<[Fe/H]/dex<+0.3) traces very well the level of lithium
enrichment attained by the ISM as inferred from observations of
cluster stars in the same metallicity range. We confirm previous
findings that the abundance of 7Li in the solar neighbourhood does not
decrease at supersolar metallicity. The comparison of the data with
the chemical evolution model predictions favours a scenario in which
the majority of the 7Li abundance in meteorites comes from novae.
Current data also seem to suggest that the nova rate flattens out at
later times. This requirement might have implications for the masses
of the white dwarf nova progenitors and deserves further
investigation. Neutrino-induced reactions taking place in
core-collapse supernovae also produce some fresh lithium. This likely
makes a negligible contribution to the meteoritic abundance, but could
be responsible for a mild increase in the 7Li abundance in the ISM of
low-metallicity systems that would counterbalance the astration
processes.
Description:
Stellar parameters and 7Li abundances for 3210 stars in the Milky Way
field are presented, as well as orbital parameters for 3210 stars and
26 open clusters in the Milky Way.
For each target star the right ascension, declination, effective
temperature, gravity, metallicity, 7Li abundance, alpha-to-iron
abundance ratio, age, galactocentric distance, galactocentric velocity
components, radial and vertical actions, radial and vertical
components of the angular momentum are given.
For each OC we report the galactocentric velocity components, radial and
vertical actions, radial and vertical components of the angular momentum.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 120 3210 Stellar parameters and 7Li abundances of field
table3.dat 90 3235 Orbital parameters of OCs and field stars
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See also:
J/A+A/651/A84 : Li abundance and mixing in giant stars (Magrini+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 17 A16 --- GES Gaia-ESO ID (HHMMSSss+DDMMSSs)
21- 29 F9.5 deg RAdeg Right ascension (J2000)
31- 38 F8.4 deg DEdeg Declination (J2000)
42- 45 I4 K Teff Effective temperature
47- 48 I2 K e_Teff Error on effective temperature
52- 55 F4.2 --- logg Surface gravity
57- 60 F4.2 --- e_logg Error on gravity
64- 68 F5.2 --- [Fe/H] Metallicity [Fe/H]
70- 73 F4.2 --- e_[Fe/H] Error on [Fe/H]
77 A1 --- l_ALi Upper limit on Li abundance
78- 81 F4.2 --- ALi Li abundance A(Li)
83- 86 F4.2 --- e_ALi ?=9.99 Error on A(Li)
90- 94 F5.2 --- alpha ?=9.99 alpha-to-iron abundance ratio
96- 99 F4.2 --- e_alpha ?=9.99 Error on alpha-to-iron abundance ratio
103-107 F5.2 Gyr Age Stellar age
109-112 F4.2 Gyr e_Age Error on stellar age
116-120 I5 pc RGC Galactocentric distance
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Cluster name/Gaia-ESO ID
21- 27 F7.2 km/s U ?=999.99 U space velocity component
31- 37 F7.2 km/s V ?=999.99 V space velocity component
41- 47 F7.2 km/s W ?=999.99 W space velocity component
51- 57 F7.3 kpc.km/s Jr ?=999.99 Radial action
61- 67 F7.3 kpc.km/s Jz ?=999.99 Vertical action
71- 79 F9.3 kpc.km/s Lr ?=999.99 Radial component of angular momentum
83- 90 F8.2 kpc.km/s Lz ?=999.99 Azimuthal action
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Acknowledgements:
Donatella Romano, donatella.romano(at)inaf.it
(End) Donatella Romano [INAF, OAS, Italy], Patricia Vannier [CDS] 06-Sep-2021