[mesa-users] oscillation data

[Richard Townsend]

On Jun 23, 2013, at 10:44 PM, Bill Paxton wrote:

> Hi Rich,
> 
> So you suggest caution --- but what do you want me to "cautiously" write in the star code that produces data for GYRE?
> Should I leave it as is (without the eps_grav) or change it to be like the FGONG/OSC output?
> 
> -B
> 
> 

Leave it unchanged for the moment. Once we've got a better idea of what's right, we can start monkeying around with it.

cheers,

Rich

> 
> 
> On Jun 23, 2013, at 2:40 PM, Richard Townsend wrote:
> 
>> 
>> On Jun 23, 2013, at 10:17 PM, Bill Paxton wrote:
>> 
>>> 
>>> On Jun 23, 2013, at 2:12 PM, Ehsan Moravveji wrote:
>>> 
>>>> SIGH,
>>>> I am all safe now.
>>>> 
>>>> Thanks Bill for the clarification regarding the extra source heats.
>>>> Are you also going to update /star/private/pulsation_info.f in this regard?
>>> 
>>> I don't think there is anything that needs to be changed in the code --- unless Rich tells me differently.
>>> The FGONG/OSC VAR(9) assignments in the code match the documentation.
>>> Of course, I'm naively assuming that matching the documentation is a good thing in this case.
>>> 
>>> Now we'll wait to see if Rich wants to change epsilon for GYRE to be like epsilon in FGONG/OSC files.
>>> The GYRE documentation says epsilon = "energy generation rate (ers/s/gm)", so I may need to add on the eps_grav term.
>>> 
>> 
>> I'm not sure myself what the best approach is here. It's worth remarking that the eps_grav term is only appreciably non-zero when a star *isn't* in thermal equilibrium; yet the non-adiabatic pulsation equations are typically derived under the assumption of thermal equilibrium. So some caution is definitely in order in including/neglecting the eps_grav term.
>> 
>> cheers,
>> 
>> Rich
>> 
>>>> It will be very fruitful to discuss with the mesa-user community how to write the epsilon term. 
>>>> I also do not know the observational status of mode excitation in binaries beyond the canonical kappa driven instability.
>>>> 
>>>> Best regards
>>>> Ehsan.
>>> 
>>> 
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