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Spatial variations ...
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Feuillet, Diane K.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
(författare)
Spatial variations in the Milky Way disc metallicity-age relation
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
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2019-08-17
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Oxford University Press (OUP),2019
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LIBRIS-ID:oai:DiVA.org:uu-396651
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396651URI
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https://doi.org/10.1093/mnras/stz2221DOI
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Språk:engelska
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Sammanfattning på:engelska
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Frankel, NeigeMax Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
(författare)
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Lind, KarinUppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)karli488
(författare)
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Frinchaboy, Peter M.Texas Christian Univ, Dept Phys & Astron, Ft Worth, TX 76129 USA
(författare)
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Garcia-Hernandez, D. A.IAC, E-38205 Tenerife, Spain;ULL, Dept Astrofis, E-38205 Tenerife, Spain
(författare)
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Lane, Richard R.Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile;Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
(författare)
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Nitschelm, ChristianUniv Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile
(författare)
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Roman-Lopes, AlexandreUniv La Serena, Fac Ciencias, Dept Fis, Cisterns 1200, La Serena, Chile
(författare)
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Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, GermanyObservationell astrofysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)489:2, s. 1742-17520035-87111365-2966
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