[Mesa-users] difficulty with custom mass loss

[Aaron Dotter]

Hi Noah,

Just a suggestion: Have you tried using other_wind?  I've used that
successfully a number of times over the years.  It might be what you're
looking for rather than other_adjust_mdot.

Aaron

On Mon, Jul 15, 2019 at 9:34 PM TUCHOW, NOAH WOLFE <nxt5109 at psu.edu> wrote:

> Hello everyone,
>
> I've been having a bit of difficulty trying to implement a custom mass
> loss rate for a main sequence star. I've started off simple, just slightly
> modifying the default work folder's inlists to make a 1 solar mass star
> losing mass with a mass loss rate given as a function of time. Since I want
> to specify a function for a custom mass loss mechanism, I have been trying
> to use the "other" hooks in run_star_extras to do so. However, I can't
> seem to get even the simplest example, a constant mass loss rate, working
> via run star extras. I made a simple subroutine called const_mdot, and I
> direct MESA to use it in extras_controls as an other_adjust_mdot. I am
> trying to set  s% star_mdot to be a value that I specify in the inlist,
> but, when I run MESA, I find that the mass of the star doesn't change at
> all.  I noticed that setting mass_change in the inlist controls does what
> I thought this would be doing, but I would eventually like to implement
> more complicated mass loss rates.
>
> Am I not implementing mass loss in the correct manner? Should I not put my
> mass loss subroutine as an other_adjust_mdot, or is s% star_mdot not the
> right quantity to be modifying? I know there is an other_wind option, but
> I'm dealing with mass loss from other sources such as CMEs not only wind.
> I've attached my inlists and run_star_extras.f  which I've been using in
> MESA r10398.  How does one specify a custom mass loss rate in MESA?
>
> Thanks,
> Noah Tuchow
>
> Noah Tuchow Penn State University Department of Astronomy and Astrophysics 532C
> Davey Lab University Park, PA 16802
>
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