Question on stellar absorption spectra

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Nereid
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Somewhat OT, but if you're interested in this sort of thing, one of the challenges for those doing stellar models was (I believe it's now solved) He ionisation in massive stars. Apparently there is a region of composition/mass/(maybe other factors) space where this ionisation occurs at the convective/radiative transport boundary - leading to all kinds of modelling challenges (the relevant stars, of course, just go do their thing, oblivious to the simulation difficulties of astrophysicists).

Something like 'if the boundary is here, then He is ionised in the convective zone; but it's unstable, a small change and it's ionised in the radiative zone, but that throws some equilibrium conditions off, so ... doggone it, how *do* we set this puppy up to avoid these conundrums?!'
 

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