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• W2892330003 abstract "We explore the origin of the observed decline in [O/Fe] (and [Mg/Fe]) with Galactocentric distance for high-metallicity stars ([Fe/H] > -1.1), based on a sample of halo stars selected within the Apache Point Observatory Galactic Evolution Experiment (APOGEE) fourteenth data release (DR14). We also analyse the characteristics of the [$alpha$/Fe] distributions in the inner-halo regions inferred from two zoom-in Milky Way mass-sized galaxies that are taken as case studies. One of them qualitatively reproduces the observed trend to have higher fraction of $alpha$-rich star for decreasing galactocentric distance; the other exhibits the opposite trend. We find that stars with [Fe/H] > -1.1 located in the range [15 - 30] kpc are consistent with formation in two starbursts, with maxima separated by about ~ 1 Gyr. We explore the contributions of stellar populations with different origin to the [$alpha$/Fe] gradients detected in stars with [Fe/H] > -1.1. Our analysis reveals that the simulated halo that best matches the observed chemical trends is characterised by an accretion history involving low to intermediate-mass satellite galaxies with a short and intense burst of star formation, and contributions from a more massive satellite with dynamical masses about ~ 10$^{10}$M$_{odot}$, distributing low-[$alpha$/Fe] stars at intermediate radius." @default.
• W2892330003 created "2018-09-27" @default.
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• W2892330003 date "2019-02-13" @default.
• W2892330003 modified "2023-09-30" @default.
• W2892330003 title "The assembly history of the Galactic inner halo inferred from α-element patterns" @default.
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• W2892330003 doi "https://doi.org/10.1093/mnras/stz443" @default.
• W2892330003 hasPublicationYear "2019" @default.
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