[Mesa-users] Binaries and wide orbital separation

[Francis Timmes]

i suggest running a single star model, the more massive one,
to make sure that works before attempting a binary.

fxt




> On Nov 2, 2020, at 2:18 AM, Amedeo Romagnolo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hello Rob,
> 
> I did as you recommended me, and apparently the code stops because the star is going into the giant phase.
> I tried to keep my code pretty vanilla, but I am obviously missing something pretty important here that I cannot understand yet.
> 
> Do you have any suggestion in this regard?
> 
> Cheers,
> 
> Amedeo
> 
> On Mon, 26 Oct 2020 at 21:35, Rob Farmer <r.j.farmer at uva.nl> wrote:
> Okay so it's not RLOF that's causing the issue, though the envelope is starting to expand. 
> 
> Next step, look at the core. Try making a kippenhan diagram. Look at what the surface is doing, so try a HR diagram.
> 
> Rob
> 
> On Mon, 26 Oct 2020 at 15:33, Amedeo Romagnolo <amedeoromagnolo at gmail.com> wrote:
> Hi Rob, you are right, sorry for not showing plots.
> I believe it happens during the red giant phase , but I don't get which kind of problems it might have encountered...
> Here attached the inlists. I tried to keep them as simple as possible.
> 
> 
> 
> 
> 
> Cheers,
> 
> Amedeo
> 
> 
> On Mon, 26 Oct 2020 at 09:48, Rob Farmer <r.j.farmer at uva.nl> wrote:
> Hi,
> It's hard to say what is happening without seeing both your inlists and any plots you have made to show what is going on.
> 
> When do you reach the min timestep limit? What is your star doing at this time? Is it at the very start of RLOF? Or is it because your star has encountered problems in the core? Or somewhere else? We can't tell unless you make some plots to explore what is going on. 
> 
> Rob
> 
> 
> On Mon, 26 Oct 2020 at 08:24, Amedeo Romagnolo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> Hi all,
> 
> I have a problem when simulating the evolution of a binary system.
> My goal would be to make the more massive star to go into RLOF, which is easily doable when I'm not setting a wide orbital separation (like a period in the order of 10^5 yr). In this case, instead, whatever I do, it seems that the code stops because a too small timestep has been reached, and therefore the star's radius has no time to grow enough to go beyond its Roche Lobe radius.
> 
> Do you have any recommendations in this regard?
> 
> Additionally, just another small question: is there an output in MESA that shows at the end of the simulation the final total metallicity of the simulated star?
> 
> Thanks in advance,
> 
> Amedeo
> 
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