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Dergiler / Physics and Astronomy Reports / 2026 / Volume: 1 Issue: 1

The Age-Metallicity Relation in the Solar Neighbourhood

Sibel Döner(ISTANBUL UNIVERSITY)0000-0001-7922-8961
Serap Ak(ISTANBUL UNIVERSITY)0000-0002-0912-6019
Özgecan Önal Taş(ISTANBUL UNIVERSITY)0000-0003-0864-1921
Olcay Plevne(ISTANBUL UNIVERSITY)0000-0002-0435-4493
Sayfa
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Yayın Tarihi
2023-06-20
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These age-metallicity relations along with the prominent differences in age, metallicity, and kinematic behaviours seen from the data, clearly show that it is important to consider the distinct formation scenarios of the Galactic disc components in modelling the Milky Way.

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Amaç & Hipotez:Age-metallicity relation for the Galactic disc is a crucial tool and is used to constrain the Galactic chemical evolution models.
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Temel Bulgular & Veri:The data cover the Galactocentric radius of 7 ≤ 𝑅gc (kpc) ≤ 9.5, but extends up to 4 kpc in height from the Galactic plane.
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Sonuç & Katkı:These age-metallicity relations along with the prominent differences in age, metallicity, and kinematic behaviours seen from the data, clearly show that it is important to consider the distinct formation scenarios of the Galactic disc components in modelling the Milky Way.
🔬Tür:Modelleme & Sayısal Simülasyon
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Galaxy: solar neighbourhood · disc · structure

Abstract

Age-metallicity relation for the Galactic disc is a crucial tool and is used to constrain the Galactic chemical evolution models. We investigated the age-metallicity relation of the Galactic disc using the red giant branch stars in the Solar neighbourhood. The data cover the Galactocentric radius of 7 ≤ 𝑅gc (kpc) ≤ 9.5, but extends up to 4 kpc in height from the Galactic plane. We used kinematic age derived from highly precise astrometric data of Gaia Data Release 2 and element abundance ratios from high-resolution spectroscopic data of APOGEE-2 catalogues. We applied a two-component Gaussian mixture model to chemically separate the programme stars into thin and thick disc populations. The stars in each population are grouped into different distance intervals from the Galactic plane. The mean metal abundances and velocity dispersions of the stars in the groups were calculated and the kinematic ages were determined from their kinematic parameters. We found a steep relation for the thin disc with -0.057±0.007 dex Gyr−1 , and even a steeper value of -0.103±0.009 dex Gyr−1 for the thick disc. These age-metallicity relations along with the prominent differences in age, metallicity, and kinematic behaviours seen from the data, clearly show that it is important to consider the distinct formation scenarios of the Galactic disc components in modelling the Milky Way.

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Bu Makaleye Atıf Yap

Döner, S., Ak, S., Taş, Ö. Ö., Plevne, O. (2023). The Age-Metallicity Relation in the Solar Neighbourhood. Physics and Astronomy Reports, Volume: 1 Issue: 1. https://doi.org/10.26650/PAR.2023.00002

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