Testing stellar yield prescriptions in omega+: implications for rising sodium abundances in young thick disc stars
We recently identified an upturn in [Na/Fe] for the population of solar-type stars in the Galactic young thick disc ($-0.3 < \mathrm{[Fe/H]} < +0.3$ dex) at supersolar metallicity in GALAH (GALactic Archaeology with HERMES) data. Here, we investigate the cause of this unexplained Na enrichment...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
January 2026
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2026, Jahrgang: 545, Heft: 2, Pages: 1-13 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/staf2079 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnras/staf2079
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| Verfasserangaben: | Evans K. Owusu, Ashley J. Ruiter, Alex J. Kemp, Sven Buder, Ivo R. Seitenzahl, Nicolas Rodriguez-Segovia, R. Pakmor, Giulia C. Cinquegrana, Nicholas Storm, Philipp Eitner and Maria Bergemann |
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| 245 | 1 | 0 | |a Testing stellar yield prescriptions in omega+ |b implications for rising sodium abundances in young thick disc stars |c Evans K. Owusu, Ashley J. Ruiter, Alex J. Kemp, Sven Buder, Ivo R. Seitenzahl, Nicolas Rodriguez-Segovia, R. Pakmor, Giulia C. Cinquegrana, Nicholas Storm, Philipp Eitner and Maria Bergemann |
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| 520 | |a We recently identified an upturn in [Na/Fe] for the population of solar-type stars in the Galactic young thick disc ($-0.3 < \mathrm{[Fe/H]} < +0.3$ dex) at supersolar metallicity in GALAH (GALactic Archaeology with HERMES) data. Here, we investigate the cause of this unexplained Na enrichment ($[{\rm Na/Fe}] \approx 0 \!-\!0.6$ dex) using the omega+ Galactic chemical evolution code. We investigate the increase of [Na/Fe] with four combinations of nucleosynthetic yields from the literature, with source contributions from core-collapse supernovae (CC SNe), asymptotic giant branch (AGB) stars, and Type Ia supernovae (SNe Ia). We focus on two possible causes for the Na enhancement: the ‘metallicity effect’ resulting from CC SNe at supersolar metallicity and the contribution of metal-rich AGB stars. We adopt two sets of SN Ia yields with one model assuming only Chandrasekhar-mass explosions, and another assuming only sub-Chandrasekhar-mass explosions. We find that the assumed SN Ia explosion has little effect on the [Na/Fe] Galactic chemical evolution modelling, and all Galactic chemical evolution models tested fail to reproduce the observed [Na/Fe] enrichment in the young thick disc population at supersolar metallicities. Our study indicates a possible ‘underpollution effect’ by SNe Ia, which are the dominant producers of iron, in the Galactic disc’s solar-type star population. These findings provide a step forward towards understanding the origin of the unexplained sodium enrichment at supersolar metallicities in the Galactic disc. | ||
| 700 | 1 | |a Ruiter, Ashley J |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kemp, Alex J |e VerfasserIn |4 aut | |
| 700 | 1 | |a Buder, Sven |e VerfasserIn |4 aut | |
| 700 | 1 | |a Seitenzahl, Ivo R |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rodriguez-Segovia, Nicolas |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pakmor, R |e VerfasserIn |4 aut | |
| 700 | 1 | |a Cinquegrana, Giulia C |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Bergemann, Maria |e VerfasserIn |4 aut | |
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