[mesa-users] Problem with stellar winds during mass transfer

[Cole Adams]

I was not aware that the binary rotation routines were not implemented,
since what I have been running appears to account for angular momentum
transfer when both stars have rotation enabled. I was able to use Bill's
workaround by turning off velocity (not surface velocity though) and it
seemed to have worked while still maintaining the rotational physics.

I managed a workaround for my current problem by re-arranging the code in
winds.f but it still doesn't work completely. I would be glad to test some
of your code for you.

Cole


On Wed, Mar 6, 2013 at 2:36 PM, Pablo Marchant <pamarca at gmail.com> wrote:

> Cole, it works exactly as you say. I'be been working on modifications to
> the binary routines and my current sources properly separate the two things
> (and add some missing physics), I could share them with you if you're
> interested in doing some testing.
>
> Regarding the topic of rotation though, there is no support for that in
> the current version of the binary routines. Of course, you can have your
> two stars rotating, but they won't transfer angular momentum between them.
> In this sense I really don't understand what you say about spinning up the
> accretor, have you implemented this yourself?
>
> Also, from what you say I guess you managed to go past the problem you
> previously mentioned on this mailing list. Is that so? I haven't had much
> more time to check that.
>
> Cheers!
>
>
> On Wed, Mar 6, 2013 at 9:25 PM, Cole Adams <adams164 at gmail.com> wrote:
>
>> Hi,
>>
>> I've been running binary systems with rotation, and I've noticed a
>> problem with the way that the winds and mass transfer function. During mass
>> transfer, the wind and accretion components of mdot appear to not be
>> treated separately. This leads to a rotational boost of mass loss not
>> behaving well during mass transfer, since the accretion effectively
>> overrides any wind loss effects. This then leads to the secondary star
>> being spun up to speeds that are not reasonable (omega/omega_crit > 1)
>> since the secondary star can't eject any mass or angular momentum. Looking
>> at the code in winds.f it seems that if accretion is greater than the wind
>> loss then wind loss is completely ignored. Is there a way to work around
>> this?
>>
>> Cole
>>
>>
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>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie
>
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