Fig. 21
Y versus 104 O/H predicted by models for the inner disc (RG = 6 kpc; top panel) and for the solar vicinity (bottom panel) with different nucleosynthesis prescriptions [short-dashed (red) lines: Model 1S; solid (blue) lines: Model 10S]. The models adopt a Scalo (1986) IMF rather than a Kroupa et al. (1993) IMF. “Observational” values for M 17 and the Sun are shown as well (see text).
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