Re: [mesa-users] sdB

[Jan-Torge S. <jts...@em...>]

Dear Rahou,

I have simulated sdB stars with an older version of MESA.

I am not aware that MESA currently has capabilities to simulate the 
complicated two star evolution that produces sdB stars.
However my approach was 'mimicking' it by

1.) Start a single star evolution with the initial mass of your sdB 
progenitor star.
2.) Run the evolution and then write out a model at the point in time 
where you would like the mass transfer to happen. (Somewhat close to but 
before the He-flash.
3.) Start the saved model but specify a M_new and let MESA take mass off 
from the outside of the star. But beware, you must be careful not too 
take off too much mass. Physically, the mass transfer will quench the 
H-shell burning and then the mass transfer will stop as well. So never 
let MESA take off mass below the H-shell burning zone.

Unfortunately, I am currently travelling and I don't have much time to 
elaborate. I did find the old inlists I used with version 7184. Be aware 
much has changed since then, but they should give you a head start.

One more advice, turn off wind for the sdB evolution. This let's you 
control the total mass better in the beginning and you can turn them on 
later for a more 'realistic' simulation ( not sure how realistic the 
wind parameters are constraint for sdBs).

At last have a look at our paper from 2015, where I describe how we 
modelled sdB stars.

Cheers,
Jan-Torge

On 05/21/2017 08:56 PM, kaoutar lahlou wrote:
> Hi mesa users:
>
> I am traying to figure out the EHB or sdB. I read in an article that 
> we need to make simulation between two stars: M _ initial and M _new.
>
> On mesa -binary, what i should make for initial condition ie for M1 
> and M2.
>
> Who will be the donor and accretor ?
>
> Thanks
>
> Rahou
>
>
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