[Mesa-users] blue loops with mesa

[Bill Paxton]

Hi Jakub,

Thanks for confirming my guess that blue loops are hopeless. ;)

I'll continue to play with overshooting until something better comes along.

Cheers,
Bill



> On Jul 1, 2018, at 12:44 PM, ostrowski <ostrowski at astro.uni.wroc.pl> wrote:
> 
> Hi Bill,
> 
> Blue loops are hopeless ;)
> 
> Actually, it's very easy to obtain and believable blue loops in mesa. You need a proper initial mass, at least 3 Ms, but 4 Ms would be more reliable, and not higher than, let's say, ~10 Ms. Then apply some inward overshooting from the outer convective envelope and you're done. So what's the catch you ask? Well, you can't predict what else you need. Additional mixing like core overshooting during main-sequence evolution or rotational mixing during MS can strongly affect emerging of the loops. In order to find some rules at some point of time I analysed large grids of models with a lot of variables but I gave up eventually. There are no hard rules - that's my best conclusion and I don't feel it's suitable for publication.
> 
> Cheers,
> Jakub
> 
> On 2018-07-01 20:31, Bill Paxton wrote:
>> i’ve been “out of the loop” on the topic of blue loops.
>> i recall that Jakub Ostrowski did work on this, but i can’t find
>> anything in ADS.
>> is there a reliable recipe for getting believable blue loops in mesa?
>> thanks
>> Bill
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