Very massive stars at low metallicity: Evolution, synthetic spectroscopy, and impact on the integrated light of starbursts

Open Access

Fig. 9

Luminosity of He II 1640 as a function of luminosity of He II 4686 for burst (triangles) and CSF (open squares) models at various metallicities. Metallicities and assumptions regarding mass-loss rates are indicated in the upper left part of the figure. The dotted line shows the relation reported by Leitherer et al. (2019).

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