Observational 17O/18O ratios (horizontal lines) compared to values obtained from various stellar evolution models. Black and red horizontal lines represent M/S- and C-type stars, respectively. The stellar evolution models are computed with the STARS code (Eggleton 1971; Stancliffe et al. 2004; Stancliffe & Eldridge 2009), the FRANEC code (Cristallo et al. 2011), and the Stromlo/Monash code (Lattanzio 1986; Karakas 2010, 2014). The red vertical line indicates the soft limit for the formation of a carbon-rich star at 1.5 M⊙. The black dots show the projections of the observed 17O/18O ratios (and their uncertainties) onto the interpolated predictions of the STARS evolution code used to derive the initial masses of the targets.
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