Optically thin HC3N/HC5N isotopologues yield 12C/13C ≈ 37 (≈48 after fractionation correction) in G+0.693, matching 3–5 kpc disc gas and implying bar-driven inflow into the CMZ.
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A revised parallel chemical evolution model with pre-enriched delayed second infall explains the Milky Way's alpha-element abundance patterns, co-evolution phase, and old low-alpha stars from APOGEE data.
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High $^{12}$C/$^{13}$C isotopic ratios toward G+0.693-0.027: evidence for gas inflow to the Central Molecular Zone
Optically thin HC3N/HC5N isotopologues yield 12C/13C ≈ 37 (≈48 after fractionation correction) in G+0.693, matching 3–5 kpc disc gas and implying bar-driven inflow into the CMZ.
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Co-evolution of the Milky Way high- and low-{\alpha} sequences with chemical evolution models
A revised parallel chemical evolution model with pre-enriched delayed second infall explains the Milky Way's alpha-element abundance patterns, co-evolution phase, and old low-alpha stars from APOGEE data.