Schematic representation of our scenario for low-mass PSs. Stars of the first and second generations are represented as red and orange, respectively. Sizes indicate the different star masses, where large, medium, and small circles represent massive, intermediate-mass, and low-mass stars, respectively. Arrows show the gas flux, with the arrow color indicating the chemical composition following the same color scheme as for the stars of the different generations, and the arrow size being roughly proportional to the gas speed. Colored areas represent zones of gas accumulation. In each panel, an approximate time for these events is given. Panels represent: a) formation of FG stars; b) pristine gas expulsion due to winds of FG massive stars; c) core-collapse SN ejecta are not retained in low-mass PSs; d) gas accumulation from winds of FG super-AGB and AGB stars; e) formation of SG stars; f) SG core-collapse SNe period; g) present-day O-Na anticorrelation. This figure is available in color in electronic form.
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