[Mesa-users] Setting H-envelope mass in subdwarfs

Evan Bauer evan.bauer.astro at gmail.com
Mon Aug 8 23:49:57 UTC 2022

Hi Kunal,

Yes, it looks like you've found the right control for retaining various H envelope masses in the make_sdb test case. I think that will do pretty much exactly what you expect, but feel free to let us know if you encounter unexpected behavior.

The other thing to be aware of is the control that defines what constitutes "H envelope mass":
https://docs.mesastar.org/en/release-r22.05.1/reference/controls.html#he-core-boundary-h1-fraction <https://docs.mesastar.org/en/release-r22.05.1/reference/controls.html#he-core-boundary-h1-fraction>

The H envelope in this case is everything above the He core boundary, and the definition of where the He core starts is set by that control.


> On Aug 2, 2022, at 10:38 PM, Kunal Deshmukh via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> Hello,
> I am looking into the make_sdb test case with plans to work on sdB evolution. The inlist_make_sdb file by default includes the lines -
>      ! simulate common envelope event removing H envelope
>            relax_initial_mass_to_remove_H_env = .true.
>            lg_max_abs_mdot = -1
> I wish to retain H-envelopes of varying masses. I found the "extra_mass_retained_by_remove_H_env" command in the defaults file. Is this the right command to use or are there other ways to do it?
> Also, any other noteworthy precautions would also be appreciated. 
> Thank you,
> Kunal Deshmukh
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users

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