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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. and François, P., et al. (2017) In Astronomy and Astrophysics 604.
Abstract

Context. 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. Aims. 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. Methods. 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... (More)

Context. 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. Aims. 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. Methods. 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. Results. We confirm the results from the literature that sulphur behaves as an α-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 7.5 kpc. No such effect is observed among dwarf stars, since they do not extend to that radius. Conclusions. 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.

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publication status
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subject
keywords
Galaxy: abundances, Galaxy: disk, Galaxy: evolution, Globular clusters: general, Open clusters and associations: general, Stars: abundances
in
Astronomy and Astrophysics
volume
604
publisher
EDP Sciences
external identifiers
  • scopus:85028535305
  • wos:000408480100072
ISSN
0004-6361
DOI
10.1051/0004-6361/201730477
language
English
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yes
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d363096a-aab5-4597-b477-e2faea462b56
date added to LUP
2017-09-27 12:12:14
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2018-04-22 04:32:22
@article{d363096a-aab5-4597-b477-e2faea462b56,
  abstract     = {<p>Context. 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. Aims. 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. Methods. 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. Results. We confirm the results from the literature that sulphur behaves as an α-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 7.5 kpc. No such effect is observed among dwarf stars, since they do not extend to that radius. Conclusions. 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.</p>},
  articleno    = {A128},
  author       = {Duffau, S. and Caffau, E. and Sbordone, L. and Bonifacio, P and Andrievsky, S. and Korotin, S. and Babusiaux, C. and Salvadori, S. and Monaco, L. and François, P. and Skúladóttir, A and Bragaglia, A. and Donati, P. and Spina, L. and Gallagher, A. J. and Ludwig, H. G. and Christlieb, N. and Hansen, C. J. and Mott, A and Steffen, M. and Zaggia, S. and Blanco-Cuaresma, S. and Calura, F. and Friel, E. and Jiménez-Esteban, F. M. and Koch, A. and Magrini, L. and Pancino, E. and Tang, B. and Tautvaišiene, G. and Vallenari, A. and Hawkins, K. and Gilmore, G. and Randich, S. and Feltzing, S. and Bensby, T. and Flaccomio, E. and Smiljanic, R. and Bayo, A and Carraro, G. and Casey, A. R. and Costado, M. T. and Damiani, F. and Franciosini, E. and Hourihane, A. and Jofré, P. and Lardo, C. and Lewis, J and Morbidelli, L. and Sousa, S. G. and Worley, C. C.},
  issn         = {0004-6361},
  keyword      = {Galaxy: abundances,Galaxy: disk,Galaxy: evolution,Globular clusters: general,Open clusters and associations: general,Stars: abundances},
  language     = {eng},
  month        = {08},
  publisher    = {EDP Sciences},
  series       = {Astronomy and Astrophysics},
  title        = {The Gaia-ESO Survey : Galactic evolution of sulphur and zinc},
  url          = {http://dx.doi.org/10.1051/0004-6361/201730477},
  volume       = {604},
  year         = {2017},
}