Fig. 5

A set of the evolutionary tracks of pre-main-sequence stars based on Siess et al. (2000). The red line marks the upper limit for the bolometric luminosity of the DSO, LDSO ≲ 30 L⊙. The orange solid line depicts the mass of 1.3 M⊙, which we used for choosing the input parameters for radiative transfer calculations (red point).
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