Re: [mesa-users] LS

[Martin C. <mar...@gm...>]

Yea it definitely looks wrong to me.

I ran two binary models with the wrong and corrected versions of jdot_ls,
with
-primary 40 Msun
-secondary as point mass, 27 Msun
-initial period 1.8 days
-Z = 0.014
until RLOF.
The only jdot I have enabled is LS.
Also I have do_tidal_sync = .true. !default false

Plotting the primary, I got (I hope the figures display in mailing list
emails)
[image: Inline image 1]

Recall that in MESA 8118 the J_total history output is wrong, so have to
correct it manually.
I don't think J_total should increase here.
[image: Inline image 2]

[image: Inline image 3]
[image: Inline image 4]

[image: Inline image 5]


And interestingly
[image: Inline image 6]
any idea what that's about?



thanks!
Martin




On Wed, Aug 10, 2016 at 10:31 PM, Pablo Marchant <pa...@gm...> wrote:

> Hi Martin. I think you're right, thanks for reporting this.
>
> Let me check some things and I'll get back to you,
>
> On Wed, Aug 10, 2016 at 1:58 AM, Martin C. <mar...@gm...> wrote:
>
>> Hi all,
>>
>> Forgive me if I'm confused here, but I've convinced myself that equation
>> 7 in MESA paper 3 has some wrong signs:
>>
>> [image: Inline image 1]
>>
>> deltaS are changes while S_lost are absolute amounts it seems (positive).
>> So if the only change in spin AM is due to mass loss, my understanding is
>> that Jdot_ls should be zero, but with this equation it wouldn't be ?
>>
>> The code is faithful to the equation as far as I can tell in
>> binary_jdot.f90
>> [image: Inline image 1]
>> b% s_donor% angular_momentum_removed is a positive quantity when I print
>> it.
>>
>> thanks for any clarification,
>>
>> Martin
>>
>> --
>> Martin C.
>>
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>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie
>



-- 
Martin C.