 ...Hameury & Ritter (1997)^{}

Those authors denote
by x,
by G(x) and
by g(x).
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 ... thin^{}

"Optically thin'' means optically thin for the outgoing radiation
field. The same atmospheric layers can be optically thick for the
incoming radiation field.
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 ...##)^{}

In that paper q is defined as
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i.e.,
inverse of the definition here.
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 ... assuming^{}

This assumption is not necessarily fulfilled, especially for giants,
but it simplifies the following equations and does not affect the
results significantly.
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 ... derivative^{}

In that paper K is defined as
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 ...
shows^{}

To perform the evolutionary computations shown in Figs. 16
and 22 from the initial turnon of mass transfer
to the minimum period without any discontinuity we used opacity tables
for solar composition in the outer layers. Comparisons with computations
using correct Helium and CNO abundances for the final mass transfer
phase indicate that, though using "incorrect'' opacity tables
in that evolutionary stage leads to a different stellar radius, it
does not affect the mass transfer cycles significantly.
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