[Mesa-users] Dust formation

[Aaron Dotter]

Hi Roberto,

Are you aware of any other opacity tables dealing with low T and Rho and
> including H?
>

No, I'm not.  If anyone who reads this knows of a source, I hope they'll
share it with us.

Aaron

>
>
> On Sat, 17 Nov 2018 at 03:59, Aaron Dotter <aaron.dotter at gmail.com> wrote:
>
>> Hi Roberto,
>>
>> I am dealing with gas having temperatures lower than 10^3 K, in some
>>> situations lower than 10^2 K and densities of the order of 10^-13gcm-3.
>>> According to the MESA paper this should below the thresholds tabulated.
>>> In this case how does the code handle the opacities?
>>>
>>
>> The code decides what to do in cases like this from the logical flag
>> clip_to_kap_table_boundaries, which is set to .true. in
>> kap/public/kap_def.f90.
>>
>> If you have a temperature that is below the table limit, then you'll get
>> an opacity value that is consistent with the lowest temperature in the
>> table.  Likewise for density.
>>
>> If you were to set this flag to false (and recompile!), then whenever you
>> go outside of table the call to kap would return an error and the run would
>> stop.
>>
>> Depending on your case, you might look at using the Freedman et al.
>> opacities. These have a much lower temperature limit (logT_min = 1.88) but
>> also note that these are H-free.  This is discussed in MESA 2.
>>
>> Cheers,
>> Aaron
>>
>>
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