[Mesa-users] Issues with mass loss from 20Msun star

[Rob Farmer]

Hi,

>The first issue is, that when using the mass loss as given in the inlist,
about 11Msun for this star, which is a bit much

Wind mass loss rates from massive stars still have uncertainities in them,
see for instance
https://ui.adsabs.harvard.edu/abs/2017A%26A...603A.118R/abstract . So its
possible for your case that you need to tweak the scaling factors if you
want more/less mass loss (or choose a different prescription for the mass
loss).

>Since updating from version 10398 to version 12115, the custom wind
scheme, following Schootemeijer et al. 2018, is no longer working right,
making the star lose only 2.5Msun instead of the expected ~10Msun which it
did in version 10398. However, I cannot find what might be the problem here.

Many thing change in mesa between versions. The wind routines take very few
inputs (Lsurf, Msurf, Rsurf, Tsurf), maybe try plotting the L,R,T at the
surface of the star between the two versions and see if you can see what is
changing in the surface properties which would then drive the change in the
mass loss rate.

Rob


On Fri, 6 Mar 2020 at 10:29, Hannah Brinkman via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear all,
>
> Recently I have been trying to make pre-SN models for a 20Msun star, using
> the inlist given by  Frank Timmes a couple of weeks ago. The inlist works
> fine when using the settings given in the inlist. However, I have
> encountered two issues around the mass loss. The first issue is, that when
> using the mass loss as given in the inlist, about 11Msun for this star,
> which is a bit much. And when switching from the exponential overshoot
> given in the inlist to the step-overshoot I have been using before, the
> winds become so strong that the star loses 13Msun, which is the entire
> hydrogen envelope of this star, which should not happen yet for this mass.
> The second issue that I have encountered is that the wind scheme in the
> run_star_extras.f has the opposite problem. Since updating from version
> 10398 to version 12115, the custom wind scheme, following Schootemeijer et
> al. 2018, is no longer working right, making the star lose only 2.5Msun
> instead of the expected ~10Msun which it did in version 10398. However, I
> cannot find what might be the problem here.
>
> Does anyone have any idea where these issues might come from? Attached is
> the inlist I have used and the run_star_extras.f.
>
> Thanks in advance for any suggestions.
> Cheers,
> Hannah
>
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