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• W2921000512 abstract "The binned oxygen distribution, derived using new Cepheid observations, demonstrates wriggling radial pattern with different gradients in various ranges of Galactic radius, in particular a plateau distribution within 7 ≲ r ≲ 9 kpc (for the solar distance r⊙ = 7.9 kpc) where the mean Galactic abundance is about 0.2 dex higher than the solar one. Our modelling of oxygen synthesis in the Galactic disc is based on the refine theory that takes into account the combined effect of corotation resonance and turbulent diffusion on the disc enrichment. The theory fits to observations best of all if the time-scale (⁠|$t_{rm f}=-f/skew3dot{f}$|⁠) of gas infall rate f(r, t) (where r and t are the Galactocentric radius and time, respectively) on to the disc is tf ∼ 2–3 Gyr whereas the fit is the worst if tf ∼ 6 Gyr (the last means that the high rate of gas infall at present epoch ∼1.5 M⊙ yr−1 does not satisfy the observed oxygen radial distribution). For inside-out scenario, further studies are necessary. Using the derived mean masses of newly synthesized oxygen ejected per core-collapsed supernova and theoretical oxygen yields, we compute the initial upper masses, mU, of stars that can explode as core-collapsed supernovae. Our estimates show that if tf ∼ 2 Gyr in the framework of rotating stars, their mU are no more than 24 M⊙, but if tf ∼ 3 Gyr in model of rotating stars or in the case of non-rotating star mU can be as high as 40–50 M⊙ like Wolf–Rayet stars that are considered as candidates for Types Ib/c supernovae." @default.
• W2921000512 created "2019-03-22" @default.
• W2921000512 creator A5041076144 @default.
• W2921000512 creator A5071672452 @default.
• W2921000512 date "2017-10-09" @default.
• W2921000512 modified "2023-10-01" @default.
• W2921000512 title "On the radial oxygen distribution in the Galactic disc" @default.
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• W2921000512 doi "https://doi.org/10.1093/mnras/stx2586" @default.
• W2921000512 hasPublicationYear "2017" @default.
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