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Verfasst von:Lu, Yuxi [VerfasserIn]   i
 Minchev, Ivan [VerfasserIn]   i
 Buck, Tobias [VerfasserIn]   i
 Khoperskov, Sergey [VerfasserIn]   i
 Steinmetz, Matthias [VerfasserIn]   i
 Libeskind, Noam [VerfasserIn]   i
 Cescutti, Gabriele [VerfasserIn]   i
 Freeman, Ken C [VerfasserIn]   i
 Ratcliffe, Bridget [VerfasserIn]   i
Titel:There is no place like home - finding birth radii of stars in the Milky Way
Verf.angabe:Yuxi (Lucy) Lu, Ivan Minchev, Tobias Buck, Sergey Khoperskov, Matthias Steinmetz, Noam Libeskind, Gabriele Cescutti, Ken C. Freeman and Bridget Ratcliffe
E-Jahr:2024
Jahr:16 October 2024
Umfang:14 S.
Fussnoten:Gesehen am 03.07.2025
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2024
Band/Heft Quelle:535(2024), 1 vom: Nov., Seite 392-405
ISSN Quelle:1365-2966
Abstract:Stars move away from their birthplaces over time via a process known as radial migration, which blurs chemo-kinematic relations used for reconstructing the Milky Way (MW) formation history. To understand the true time evolution of the MW, one needs to take into account the effects of this process. We show that stellar birth radii can be derived directly from the data with minimum prior assumptions on the Galactic enrichment history. This is done by first recovering the time evolution of the stellar birth metallicity gradient, $\mathrm{ d}\mathrm{[Fe/H]}(R, \tau)/\mathrm{ d}R$, through its inverse relation to the metallicity range as a function of age today, allowing us to place any star with age and metallicity measurements back to its birthplace, R$_b$. Applying our method to a large high-precision data set of MW disc subgiant stars, we find a steepening of the birth metallicity gradient from 11 to 8 Gyr ago, which coincides with the time of the last massive merger, Gaia-Sausage-Enceladus (GSE). This transition appears to play a major role in shaping both the age-metallicity relation and the bimodality in the [$\alpha$/Fe]-[Fe/H] plane. By dissecting the disc into mono-R$_b$ populations, clumps in the low-[$\alpha$/Fe] sequence appear, which are not seen in the total sample and coincide in time with known star-formation bursts, possibly associated with the Sagittarius Dwarf Galaxy. We estimated that the Sun was born at $4.5\pm 0.4$ kpc from the Galactic centre. Our R$_b$ estimates provide the missing piece needed to recover the Milky Way formation history.
DOI:doi:10.1093/mnras/stae2364
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1093/mnras/stae2364
 DOI: https://doi.org/10.1093/mnras/stae2364
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1929685793
Verknüpfungen:→ Zeitschrift

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