[mesa-users] Internal energy

Francis Timmes fxt44 at mac.com
Tue May 3 11:49:11 EDT 2016


this is discussed at length in rogers et al 1996 paper
discussing the opal eos, with the last sentence of section 3
summarizing. in short, yes, ionization is included in the
energy values reported by the opal eos, i.e., an internal energy 
as opposed to a thermal energy.

fxt


> On May 3, 2016, at 8:27 AM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:
> 
> Hi Matthew,
> 
> Great question -- I wish I had a quick answer.  Someone needs to do some digging to confirm what seems to be the case.
> 
> In the regions where ionization matters, mesa draws on eos data from OPAL (or SCVH in some cases). 
> 
> The internal energy mesa reports is the internal energy from OPAL.  
> 
> So your question is really about the OPAL eos.
> 
> I expect that the ionization energy is included, but I haven't found an explicit statement to confirm that hunch.
> 
> Perhaps someone knows more about this aspect of the OPAL eos?  It would be excellent to get a solid answer.
> 
> Cheers,
> Bill
> 
> 
> 
> On May 3, 2016, at 3:05 AM, Matthew Clayton wrote:
> 
>> Hi there,
>> Quick question about the internal energy values in MESA:
>> Does the reported value of the internal energy (e.g. The "energy" profile output) include the potential energy stored in the ionization of the material, or is it just the thermal energy?
>> Cheers,
>> Matthew
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