WFRF:(Nitschelm Christian)
Sökning: WFRF:(Nitschelm Christian) > (2019) > Spatial variations ...
Spatial variations in the Milky Way disc metallicity-age relation
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- Feuillet, Diane K. (författare)
- Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- Frankel, Neige (författare)
- Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- (creator_code:org_t)
- 2019-08-17
- 2019
- Engelska.
- Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 489:2, s. 1742-1752
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Stellar ages are a crucial component to studying the evolution of the Milky Way. Using Gaia DR2 distance estimates, it is now possible to estimate stellar ages for a larger volume of evolved stars through isochrone matching. This work presents [M/H]-age and [alpha/M]-age relations derived for different spatial locations in the Milky Way disc. These relations are derived by hierarchically modelling the star formation history of stars within a given chemical abundance bin. For the first time, we directly observe that significant variation is apparent in the [M/H]-age relation as a function of both Galactocentric radius and distance from the disc midplane. The [M/H]-age relations support claims that radial migration has a significant effect in the plane of the disc. Using the [M/H] bin with the youngest mean age at each radial zone in the plane of the disc, the present-day metallicity gradient is measured to be -0.059 +/- 0.010 dex kpc(-1), in agreement with Cepheids and young field stars. We find a vertically flared distribution of young stars in the outer disc, confirming predictions of models and previous observations. The mean age of the [M/H]-[alpha/M] distribution of the solar neighbourhood suggests that the high-[M/H] stars are not an evolutionary extension of the low-alpha sequence. Our observational results are important constraints to Galactic simulations and models of chemical evolution.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: abundances
- Galaxy: disc
- Galaxy: evolution
- Galaxy: stellar content
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- Frankel, Neige
- Lind, Karin
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- Lane, Richard R.
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- Nitschelm, Chris ...
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