[Mesa-users] Question regarding create_pre_main_sequence_model unused in binary mode

[Francis Timmes]

hi ealeal,

this is not a single / binary model issue per se.

http://mesa.sourceforge.net/star_job_defaults.html#starting_model

by default, a zams starting model of the specified mass is loaded at the start.
one can override this default by using, for example, create_pre_main_sequence_model.

at the beginning of a run mesa can enter a "relaxation" mode to find a suitable model. 
this is a pseudo-evolution that changes a model (say the mass or angular momentum to be more concrete) 
to reach a user specified target. this relaxation commonly uses a "timestep" of 1e5 yr. 
once a suitable model is found, the pseudo-evolution relaxation terminates and the full evolution begins.

fxt





> On Nov 29, 2020, at 9:47 AM, Bear Ealeal via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Binary mode vs. single mode
> 
> In the single mode when evolving a star from the beginning , examples in test_suite use create_pre_main_sequence_model=.true. or a loaded file. However in the binary mode examples do not use this option. However, the code starts at some point and evolves.
> 
> For example in evolve_both_stars in test_suite the option of create_pre_main_sequence_model is not activated, however when running the example it starts at 1e5yr. From where does it get the data to start? what are the initial conditions for this option?
> 
> Thanks,
> 
> Ealeal
> 
> 
> 
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