# University of Hertfordshire

## The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc

Research output: Contribution to journalArticlepeer-review

### Standard

The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc. / Casali, G.; Spina, L.; Magrini, L.; Karakas, A.; Kobayashi, C.; Casey, A. R.; Feltzing, S.; Swaelmen, M. Van der; Tsantaki, M.; Jofré, P.; Bragaglia, A.; Feuillet, D.; Bensby, T.; Biazzo, K.; Gonneau, A.; Tautvaisiene, G.; Baratella, M.; Roccatagliata, V.; Pancino, E.; Adibekyan, V.; Martell, S.; Bayo, A.; Jeffries, R. D.; Gilmore, G.; Randich, S.; Alfaro, E.; Koposov, S. E.; Korn, A. J.; Recio-Blanco, A.; Smiljanic, R.; Franciosini, E.; Hourihane, A.; Monaco, L.; Morbidelli, L.; Sacco, G.; Worley, C.; Zaggia, S.

In: Astronomy & Astrophysics, Vol. 639, A127, 21.07.2020.

Research output: Contribution to journalArticlepeer-review

### Harvard

Casali, G, Spina, L, Magrini, L, Karakas, A, Kobayashi, C, Casey, AR, Feltzing, S, Swaelmen, MVD, Tsantaki, M, Jofré, P, Bragaglia, A, Feuillet, D, Bensby, T, Biazzo, K, Gonneau, A, Tautvaisiene, G, Baratella, M, Roccatagliata, V, Pancino, E, Adibekyan, V, Martell, S, Bayo, A, Jeffries, RD, Gilmore, G, Randich, S, Alfaro, E, Koposov, SE, Korn, AJ, Recio-Blanco, A, Smiljanic, R, Franciosini, E, Hourihane, A, Monaco, L, Morbidelli, L, Sacco, G, Worley, C & Zaggia, S 2020, 'The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc', Astronomy & Astrophysics, vol. 639, A127. https://doi.org/10.1051/0004-6361/202038055

### APA

Casali, G., Spina, L., Magrini, L., Karakas, A., Kobayashi, C., Casey, A. R., Feltzing, S., Swaelmen, M. V. D., Tsantaki, M., Jofré, P., Bragaglia, A., Feuillet, D., Bensby, T., Biazzo, K., Gonneau, A., Tautvaisiene, G., Baratella, M., Roccatagliata, V., Pancino, E., ... Zaggia, S. (2020). The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc. Astronomy & Astrophysics, 639, [A127]. https://doi.org/10.1051/0004-6361/202038055

### Author

Casali, G. ; Spina, L. ; Magrini, L. ; Karakas, A. ; Kobayashi, C. ; Casey, A. R. ; Feltzing, S. ; Swaelmen, M. Van der ; Tsantaki, M. ; Jofré, P. ; Bragaglia, A. ; Feuillet, D. ; Bensby, T. ; Biazzo, K. ; Gonneau, A. ; Tautvaisiene, G. ; Baratella, M. ; Roccatagliata, V. ; Pancino, E. ; Adibekyan, V. ; Martell, S. ; Bayo, A. ; Jeffries, R. D. ; Gilmore, G. ; Randich, S. ; Alfaro, E. ; Koposov, S. E. ; Korn, A. J. ; Recio-Blanco, A. ; Smiljanic, R. ; Franciosini, E. ; Hourihane, A. ; Monaco, L. ; Morbidelli, L. ; Sacco, G. ; Worley, C. ; Zaggia, S. / The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc. In: Astronomy & Astrophysics. 2020 ; Vol. 639.

### Bibtex

@article{01e3e584f794436780b2e2c4205e42fd,
title = "The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc",
abstract = "In the era of large spectroscopic surveys, massive databases of high-quality spectra provide tools to outline a new picture of our Galaxy. In this framework, an important piece of information is provided by our ability to infer stellar ages. We aim to provide empirical relations between stellar ages and abundance ratios for a sample of solar-like stars. We investigate the dependence on metallicity, and we apply our relations to Gaia-ESO samples of open clusters and field stars. We analyse high-resolution and high-S/N HARPS spectra of a sample of solar-like stars to obtain precise determinations of their atmospheric parameters and abundances through differential spectral analysis and age through isochrone fitting. We investigate the relations between ages and abundance ratios. For the abundance ratios with a steeper dependence on age, we perform multivariate linear regressions, including the dependence on metallicity. We apply our relations to a sample of open clusters located in 47 kpc. In these clusters, the content of s-elements is lower than expected from chemical evolution models, and consequently the [s/$\alpha$] are lower than in clusters of the same age located in the solar neighbourhood. With our chemical evolution model and a set of empirical yields, we suggest that a strong dependence on the star formation history and metallicity-dependent yields of s-elements can substantially modify the slope of the [s/$\alpha$]-[Fe/H]-age relation in different regions of the Galaxy. Our results point towards a non-universal relation [s/$\alpha$]-[Fe/H]-age, indicating the existence of relations at different R$_{GC}$ or for different star formation history. A better understanding of the s-process at high metallicity is necessary to fully understand the origin of these variations. ",
keywords = "astro-ph.GA, astro-ph.SR",
author = "G. Casali and L. Spina and L. Magrini and A. Karakas and C. Kobayashi and Casey, {A. R.} and S. Feltzing and Swaelmen, {M. Van der} and M. Tsantaki and P. Jofr{\'e} and A. Bragaglia and D. Feuillet and T. Bensby and K. Biazzo and A. Gonneau and G. Tautvaisiene and M. Baratella and V. Roccatagliata and E. Pancino and V. Adibekyan and S. Martell and A. Bayo and Jeffries, {R. D.} and G. Gilmore and S. Randich and E. Alfaro and Koposov, {S. E.} and Korn, {A. J.} and A. Recio-Blanco and R. Smiljanic and E. Franciosini and A. Hourihane and L. Monaco and L. Morbidelli and G. Sacco and C. Worley and S. Zaggia",
note = "{\textcopyright} ES0 2020. The original publication is available at https://doi.org/10.1051/0004-6361/202038055.",
year = "2020",
month = jul,
day = "21",
doi = "10.1051/0004-6361/202038055",
language = "English",
volume = "639",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

### RIS

TY - JOUR

T1 - The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc

AU - Casali, G.

AU - Spina, L.

AU - Magrini, L.

AU - Karakas, A.

AU - Kobayashi, C.

AU - Casey, A. R.

AU - Feltzing, S.

AU - Swaelmen, M. Van der

AU - Tsantaki, M.

AU - Jofré, P.

AU - Bragaglia, A.

AU - Feuillet, D.

AU - Bensby, T.

AU - Biazzo, K.

AU - Gonneau, A.

AU - Tautvaisiene, G.

AU - Baratella, M.

AU - Roccatagliata, V.

AU - Pancino, E.

AU - Martell, S.

AU - Bayo, A.

AU - Jeffries, R. D.

AU - Gilmore, G.

AU - Randich, S.

AU - Alfaro, E.

AU - Koposov, S. E.

AU - Korn, A. J.

AU - Recio-Blanco, A.

AU - Smiljanic, R.

AU - Franciosini, E.

AU - Hourihane, A.

AU - Monaco, L.

AU - Morbidelli, L.

AU - Sacco, G.

AU - Worley, C.

AU - Zaggia, S.

N1 - © ES0 2020. The original publication is available at https://doi.org/10.1051/0004-6361/202038055.

PY - 2020/7/21

Y1 - 2020/7/21

N2 - In the era of large spectroscopic surveys, massive databases of high-quality spectra provide tools to outline a new picture of our Galaxy. In this framework, an important piece of information is provided by our ability to infer stellar ages. We aim to provide empirical relations between stellar ages and abundance ratios for a sample of solar-like stars. We investigate the dependence on metallicity, and we apply our relations to Gaia-ESO samples of open clusters and field stars. We analyse high-resolution and high-S/N HARPS spectra of a sample of solar-like stars to obtain precise determinations of their atmospheric parameters and abundances through differential spectral analysis and age through isochrone fitting. We investigate the relations between ages and abundance ratios. For the abundance ratios with a steeper dependence on age, we perform multivariate linear regressions, including the dependence on metallicity. We apply our relations to a sample of open clusters located in 47 kpc. In these clusters, the content of s-elements is lower than expected from chemical evolution models, and consequently the [s/$\alpha$] are lower than in clusters of the same age located in the solar neighbourhood. With our chemical evolution model and a set of empirical yields, we suggest that a strong dependence on the star formation history and metallicity-dependent yields of s-elements can substantially modify the slope of the [s/$\alpha$]-[Fe/H]-age relation in different regions of the Galaxy. Our results point towards a non-universal relation [s/$\alpha$]-[Fe/H]-age, indicating the existence of relations at different R$_{GC}$ or for different star formation history. A better understanding of the s-process at high metallicity is necessary to fully understand the origin of these variations.

AB - In the era of large spectroscopic surveys, massive databases of high-quality spectra provide tools to outline a new picture of our Galaxy. In this framework, an important piece of information is provided by our ability to infer stellar ages. We aim to provide empirical relations between stellar ages and abundance ratios for a sample of solar-like stars. We investigate the dependence on metallicity, and we apply our relations to Gaia-ESO samples of open clusters and field stars. We analyse high-resolution and high-S/N HARPS spectra of a sample of solar-like stars to obtain precise determinations of their atmospheric parameters and abundances through differential spectral analysis and age through isochrone fitting. We investigate the relations between ages and abundance ratios. For the abundance ratios with a steeper dependence on age, we perform multivariate linear regressions, including the dependence on metallicity. We apply our relations to a sample of open clusters located in 47 kpc. In these clusters, the content of s-elements is lower than expected from chemical evolution models, and consequently the [s/$\alpha$] are lower than in clusters of the same age located in the solar neighbourhood. With our chemical evolution model and a set of empirical yields, we suggest that a strong dependence on the star formation history and metallicity-dependent yields of s-elements can substantially modify the slope of the [s/$\alpha$]-[Fe/H]-age relation in different regions of the Galaxy. Our results point towards a non-universal relation [s/$\alpha$]-[Fe/H]-age, indicating the existence of relations at different R$_{GC}$ or for different star formation history. A better understanding of the s-process at high metallicity is necessary to fully understand the origin of these variations.

KW - astro-ph.GA

KW - astro-ph.SR

U2 - 10.1051/0004-6361/202038055

DO - 10.1051/0004-6361/202038055

M3 - Article

VL - 639

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A127

ER -