[Mesa-users] different 'MLT_option'

[Etienne Kaiser]

Dear MESA-user

I am interested in the implementation of the different 'MLT_option' in MESA. In particular, I am interested in the difference between the options 'Cox' and 'ML1'

I did a 'grep' search and found that the mlt module solves the mlt equations and defines a_0 and A following Cox & Giuli (1968), Eqs. (14.71)-(14.73). The two variables a_0 and A differ, depending on the mixing-length version chosen in 'MLT_option'. While for 'MLT_option = 'Cox'' the code calculates A according to Eq.(14.70), it follows Ludwig et al. (1999) for the other 'MLT_options', for example the 'ML1' option, by setting ff_i parameters. After putting the ff_i parameter into the equation for A and some rearrangement, I arrive at the conclusion that the A and a_0 are identical for 'MLT_options = 'Cox'' and 'ML1'

I now wonder, if I overlooked something else in the code or, if not, why there are two different implemented options in the code that compute the same A.

Thanks for your help.
Cheers,
Etienne

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