[Mesa-users] Blue loops

[Jeremy Sakstein]

Thanks Radek,

It looks very similar to the inlist I am using so that is good. The only
difference is the mixing length scheme. I think for my purposes as long as
I am consistent this should not matter too much.

Cheers,

Jeremy

On Wed, Apr 3, 2019 at 11:34 AM Radek Smolec <smolec at camk.edu.pl> wrote:

> Jeremy,
> for 5M_cepheid_blue_loop see the recent public release.
> I attach the relevant inlist for your reference.
>
> You may also take a look at Section 2.4.2 of the instrument paper:
> https://arxiv.org/abs/1903.01426
> Tracks in Figure 13 were computed using this test_suite example.
> Cheers,
> Radek
>
>
> śr., 3 kwi 2019 o 17:25 Jeremy Sakstein <sakstein at sas.upenn.edu>
> napisał(a):
>
>> Thanks Radek,
>>
>> Comments below.
>>
>> Cheers,
>>
>> Jeremy
>>
>> On Wed, Apr 3, 2019 at 11:21 AM Radek Smolec <smolec at camk.edu.pl> wrote:
>>
>>> Dear Jeremy,
>>>
>>> śr., 3 kwi 2019 o 16:55 Jeremy Sakstein <sakstein at sas.upenn.edu>
>>> napisał(a):
>>>
>>>> Dear Mesa community,
>>>>
>>>> I've been using MESA to calculate blue loops for Z=0.0006 Cepheids in
>>>> the mass range [image: 5-13 M_\odot] and had a couple of questions I
>>>> was hoping you could answer.
>>>>
>>>> Nominally, I am a theorist so my approach so far has been to use the
>>>> inlist for 7M pre MS to AGB with
>>>>
>>> You may also start with 5M_cepheid_blue_loop in the test_suite.
>>>
>>
>> Thanks. I didn't see this in the test suit (I am using 10398*)*
>>
>>
>>>
>>>
>>>>
>>>> mixing_length_alpha = 1.73
>>>> initial_z = 0.0006
>>>> alpha_semiconvection = 0.1
>>>> use_Ledoux_criterion = .true.
>>>>
>>>> and cary the initial mass over this range.
>>>>
>>>> Initially, I was only using 7-9 [image: M_\odot] but now I need to
>>>> push to a larger range and am getting funny results e.g. the loops cross.
>>>>
>>> What do you mean by "the loops cross"? That single evolutionary track
>>> passes through the same (Teff, L) point? For larger masses this is
>>> expected.
>>>
>>
>> Yes, that is what I mean. Good to know this is normal.
>>
>>
>>>
>>>
>>>>
>>>> I am wondering if what I am doing is sensible given that the physics of
>>>> these objects could be very different depending on mass. In particular, I
>>>> am not sure what people typically use for e.g. the semi-convection
>>>> parameter at higher and lower masses.
>>>>
>>> I'm not sure what is the range of semi-convection parameter considered
>>> in the literature. 0.1 seems raesonable.
>>> Note that the shape and extent of the loops is very sensitive to many
>>> parameters: chemical composition, overshooting from the convective regions,
>>> rotation...
>>> Cheers,
>>> Radek
>>>
>>>
>>>> I'd be grateful for any help you can give.
>>>>
>>>> Cheers,
>>>>
>>>> Jeremy
>>>> _______________________________________________
>>>> mesa-users at lists.mesastar.org
>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>>
>>>>
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