J/A+A/604/A128 S abundances for 1301 stars from GES (Duffau+, 2017)
The Gaia-ESO Survey: Galactic evolution of sulphur and zinc.
Duffau S., Caffau E., Sbordone L., Bonifacio P., Andrievsky S.,
Korotin S., Babusiaux C., Salvadori S., Monaco L., Francois P.,
Skuladottir A., Bragaglia A., Donati P., Spina L., Gallagher A.J.,
Ludwig H.-G., Christlieb N., Hansen C.J., Mott A., Steffen M., Zaggia S.,
Blanco-Cuaresma S., Calura F., Friel E., Jimenez-Esteban F.M., Koch A.,
Magrini L., Pancino E., Tang B., Tautvaisiene G., Vallenari A.,
Hawkins K., Gilmore G., Randich S., Feltzing S., Bensby T., Flaccomio E.,
Smiljanic R., Bayo A., Carraro G., Casey A. R., Costado M. T., Damiani F.,
Franciosini E., Hourihane A., Jofre P., Lardo C., Lewis J., Morbidelli L.,
Sousa S.G., Worley C.C.
<Astron. Astrophys. 604, A128 (2017)>
=2017A&A...604A.128D 2017A&A...604A.128D (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, dwarfs ; Stars, giant ; Abundances ;
Spectroscopy
Keywords: Galaxy: abundances - Galaxy: evolution - Galaxy: disk -
stars: abundances - open clusters and associations: general -
globular clusters: general
Abstract:
Due to their volatile nature, when sulphur and zinc are observed in
external galaxies, their determined abundances represent the gas-phase
abundances in the interstellar medium. This implies that they can be
used as tracers of the chemical enrichment of matter in the Universe
at high redshift. Comparable observations in stars are more difficult
and, until recently, plagued by small number statistics. We wish to
exploit the Gaia ESO Survey (GES) data to study the behaviour of
sulphur and zinc abundances of a large number of Galactic stars, in a
homogeneous way. By using the UVES spectra of the GES sample, we are
able to assemble a sample of 1301 Galactic stars, including stars in
open and globular clusters in which both sulphur and zinc were
measured. We confirm the results from the literature that sulphur
behaves as an alpha-element. We find a large scatter in [Zn/Fe] ratios
among giant stars around solar metallicity. The lower ratios are
observed in giant stars at Galactocentric distances less than 7.5kpc.
No such effect is observed among dwarf stars, since they do not extend
to that radius. Given the sample selection, giants and dwarfs are
observed at different Galactic locations, and it is plausible, and
compatible with simple calculations, that Zn-poor giants trace a
younger population more polluted by SN Ia yields. It is necessary to
extend observations in order to observe both giants and dwarfs at the
same Galactic location. Further theoretical work on the evolution of
zinc is also necessary.
Description:
GES internal star identifier (CNAME), Sulphur abundances and NLTE
corrections to the Sulphur abundances for 1301 stars. Sulphur
abundances are expressed in the customary logarithmic form:
A(S)=log_10(N(S)/N(H))+12.
The abundances delivered are the LTE ones. NLTEabundances can be
determined by directly summing the NLTE correction delivered:
A(S)_NLTE = A(S) + NLTE_C.
So that a negative NLTE correction indicates that the NLTE abundance
is lower than the LTE one.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gessdu.dat 37 1301 Sulphur abundances
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See also:
J/A+A/572/A33 : Abundances from Gaia-ESO Survey (Mikolaitis+, 2014)
J/A+A/589/A115 : Na and Al abundances of 1303 stars (Smiljanic+, 2016)
J/A+A/603/A2 : GES abundances radial distribution (Magrini+, 2017)
J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)
Byte-by-byte Description of file: gessdu.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Cname GES star unique identifier (HHMMSSss+DDMMSSs)
19- 25 F7.4 --- A(S) Sulphur abundance (LTE)
28- 37 E10.3 --- NLTEc NLTE corrections
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Acknowledgements:
Sonia Duffau, sonia.duffau(at)gmail.com
(End) Sonia Duffau [Universidad Andres Bello] Patricia Vannier [CDS] 03-Jul-2017