Nucleosynthetic history of elements in the Galactic disk

[X/Fe]-age relations from high-precision spectroscopy

L. Spina, J. Melendez, A. I. Karakas, I. Ramirez, T. R. Monroe, M. Asplund, D. Yong

Research output: Contribution to journalArticleResearchpeer-review

35 Citations (Scopus)

Abstract

Context. The chemical composition of stars is intimately linked to the formation and evolution of the Galaxy. 

Aims. We aim to trace the chemical evolution of the Galactic disk through the inspection of the [X/Fe]-age relations of 24 species from C to Eu. 

Methods. Using high-resolution and high signal-to-noise UVES spectra of nine solar twins, we obtained precise estimates of stellar ages and chemical abundances. These determinations have been integrated with additional accurate age and abundance determinations from recent spectroscopic studies of solar twins existing in the literature, comprising superb abundances with 0.01 dex precision. Based on this data set, we outlined the [X/Fe]-age relations over a time interval of 10 Gyr. 

Results. We present the [X/Fe] - age relations for 24 elements (C, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ba, La, Ce, Nd, and Eu). Each different class of elements showed a distinct evolution with time that relies on the different characteristics, rates, and timescales of the nucleosynthesis sites from which they are produced. The α-elements are characterized by a [X/Fe] decrease with time. Strikingly, the opposite behavior is observed for Ca. The iron-peak elements show an early [X/Fe] increase followed by a decrease towards the youngest stars. The [X/Fe] for the n-capture elements decrease with age. We also found that both [Mg/Y] and [Al/Y] are precise stellar clocks, with [Al/Y] showing the steepest dependence on age. 

Conclusions. Knowledge of the [X/Fe]-age relations is a gold mine from which we can achieve a great understanding of the processes that governed the formation and evolution of the Milky Way. Through the reverse engineering of these relations we will be able to put strong constraints on the nature of the stellar formation history, the SNe rates, the stellar yields, and the variety of the SNe progenitors.

Original languageEnglish
Article numberA125
Number of pages14
JournalAstronomy and Astrophysics: a European journal
Volume593
DOIs
Publication statusPublished - 1 Sep 2016

Keywords

  • Galaxy: abundances
  • Galaxy: disk
  • Galaxy: evolution
  • Stars: abundances
  • Stars: fundamental parameters
  • Stars: solar-type

Cite this

@article{0e6ab2c33f464d9da2f3b8f078c404a7,
title = "Nucleosynthetic history of elements in the Galactic disk: [X/Fe]-age relations from high-precision spectroscopy",
abstract = "Context. The chemical composition of stars is intimately linked to the formation and evolution of the Galaxy. Aims. We aim to trace the chemical evolution of the Galactic disk through the inspection of the [X/Fe]-age relations of 24 species from C to Eu. Methods. Using high-resolution and high signal-to-noise UVES spectra of nine solar twins, we obtained precise estimates of stellar ages and chemical abundances. These determinations have been integrated with additional accurate age and abundance determinations from recent spectroscopic studies of solar twins existing in the literature, comprising superb abundances with 0.01 dex precision. Based on this data set, we outlined the [X/Fe]-age relations over a time interval of 10 Gyr. Results. We present the [X/Fe] - age relations for 24 elements (C, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ba, La, Ce, Nd, and Eu). Each different class of elements showed a distinct evolution with time that relies on the different characteristics, rates, and timescales of the nucleosynthesis sites from which they are produced. The α-elements are characterized by a [X/Fe] decrease with time. Strikingly, the opposite behavior is observed for Ca. The iron-peak elements show an early [X/Fe] increase followed by a decrease towards the youngest stars. The [X/Fe] for the n-capture elements decrease with age. We also found that both [Mg/Y] and [Al/Y] are precise stellar clocks, with [Al/Y] showing the steepest dependence on age. Conclusions. Knowledge of the [X/Fe]-age relations is a gold mine from which we can achieve a great understanding of the processes that governed the formation and evolution of the Milky Way. Through the reverse engineering of these relations we will be able to put strong constraints on the nature of the stellar formation history, the SNe rates, the stellar yields, and the variety of the SNe progenitors.",
keywords = "Galaxy: abundances, Galaxy: disk, Galaxy: evolution, Stars: abundances, Stars: fundamental parameters, Stars: solar-type",
author = "L. Spina and J. Melendez and Karakas, {A. I.} and I. Ramirez and Monroe, {T. R.} and M. Asplund and D. Yong",
year = "2016",
month = "9",
day = "1",
doi = "10.1051/0004-6361/201628557",
language = "English",
volume = "593",
journal = "Astronomy and Astrophysics: a European journal",
issn = "0004-6361",

}

Nucleosynthetic history of elements in the Galactic disk : [X/Fe]-age relations from high-precision spectroscopy. / Spina, L.; Melendez, J.; Karakas, A. I.; Ramirez, I.; Monroe, T. R.; Asplund, M.; Yong, D.

In: Astronomy and Astrophysics: a European journal, Vol. 593, A125, 01.09.2016.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Nucleosynthetic history of elements in the Galactic disk

T2 - [X/Fe]-age relations from high-precision spectroscopy

AU - Spina, L.

AU - Melendez, J.

AU - Karakas, A. I.

AU - Ramirez, I.

AU - Monroe, T. R.

AU - Asplund, M.

AU - Yong, D.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Context. The chemical composition of stars is intimately linked to the formation and evolution of the Galaxy. Aims. We aim to trace the chemical evolution of the Galactic disk through the inspection of the [X/Fe]-age relations of 24 species from C to Eu. Methods. Using high-resolution and high signal-to-noise UVES spectra of nine solar twins, we obtained precise estimates of stellar ages and chemical abundances. These determinations have been integrated with additional accurate age and abundance determinations from recent spectroscopic studies of solar twins existing in the literature, comprising superb abundances with 0.01 dex precision. Based on this data set, we outlined the [X/Fe]-age relations over a time interval of 10 Gyr. Results. We present the [X/Fe] - age relations for 24 elements (C, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ba, La, Ce, Nd, and Eu). Each different class of elements showed a distinct evolution with time that relies on the different characteristics, rates, and timescales of the nucleosynthesis sites from which they are produced. The α-elements are characterized by a [X/Fe] decrease with time. Strikingly, the opposite behavior is observed for Ca. The iron-peak elements show an early [X/Fe] increase followed by a decrease towards the youngest stars. The [X/Fe] for the n-capture elements decrease with age. We also found that both [Mg/Y] and [Al/Y] are precise stellar clocks, with [Al/Y] showing the steepest dependence on age. Conclusions. Knowledge of the [X/Fe]-age relations is a gold mine from which we can achieve a great understanding of the processes that governed the formation and evolution of the Milky Way. Through the reverse engineering of these relations we will be able to put strong constraints on the nature of the stellar formation history, the SNe rates, the stellar yields, and the variety of the SNe progenitors.

AB - Context. The chemical composition of stars is intimately linked to the formation and evolution of the Galaxy. Aims. We aim to trace the chemical evolution of the Galactic disk through the inspection of the [X/Fe]-age relations of 24 species from C to Eu. Methods. Using high-resolution and high signal-to-noise UVES spectra of nine solar twins, we obtained precise estimates of stellar ages and chemical abundances. These determinations have been integrated with additional accurate age and abundance determinations from recent spectroscopic studies of solar twins existing in the literature, comprising superb abundances with 0.01 dex precision. Based on this data set, we outlined the [X/Fe]-age relations over a time interval of 10 Gyr. Results. We present the [X/Fe] - age relations for 24 elements (C, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ba, La, Ce, Nd, and Eu). Each different class of elements showed a distinct evolution with time that relies on the different characteristics, rates, and timescales of the nucleosynthesis sites from which they are produced. The α-elements are characterized by a [X/Fe] decrease with time. Strikingly, the opposite behavior is observed for Ca. The iron-peak elements show an early [X/Fe] increase followed by a decrease towards the youngest stars. The [X/Fe] for the n-capture elements decrease with age. We also found that both [Mg/Y] and [Al/Y] are precise stellar clocks, with [Al/Y] showing the steepest dependence on age. Conclusions. Knowledge of the [X/Fe]-age relations is a gold mine from which we can achieve a great understanding of the processes that governed the formation and evolution of the Milky Way. Through the reverse engineering of these relations we will be able to put strong constraints on the nature of the stellar formation history, the SNe rates, the stellar yields, and the variety of the SNe progenitors.

KW - Galaxy: abundances

KW - Galaxy: disk

KW - Galaxy: evolution

KW - Stars: abundances

KW - Stars: fundamental parameters

KW - Stars: solar-type

UR - http://www.scopus.com/inward/record.url?scp=84990841890&partnerID=8YFLogxK

UR - http://www.aanda.org/articles/aa/pdf/2016/09/aa28557-16.pdf

U2 - 10.1051/0004-6361/201628557

DO - 10.1051/0004-6361/201628557

M3 - Article

VL - 593

JO - Astronomy and Astrophysics: a European journal

JF - Astronomy and Astrophysics: a European journal

SN - 0004-6361

M1 - A125

ER -