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Fig. 1


Two examples of local S curves – effective temperature vs. surface density – in a He disc when irradiation is included. The upper blue set of curves shows the case Tirr = 25 000 K and r = 5 × 108 cm, the lower red set of curves corresponds to Tirr = 5000 K and r = 1010 cm. In both cases, the solid curve corresponds to α given by Eq. (4), while the dotted curves are for α = 0.05 and α = 0.2 (rightmost and leftmost curves respectively). The primary mass is 1.4 M.

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