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

[Pablo Marchant]

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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