Left: mass-luminosity relation (in solar units) adopted by Gieles et al. (2018a) compared to the predictions of the Pop III models of Schaerer (2002) and of Haemmerlé et al. (2018a, -H+18) for three different accretion rates and of the Pop II ZAMS models of Denissenkov et al. (priv. comm. see Prantzos et al. 2017). The vertical dashed lines show the mass limits that are allowed for nucleosynthesis; see text. The horizontal dotted lines show the minimum and maximum luminosities in this mass interval, according to all M-L relations. Right: mass-effective temperature relations of Haemmerlé et al. (2018a) for various accretion rates and two metallicities. In both panels the filled circles show the positions of our models.