[mesa-users] oscillation data

Ehsan Moravveji e.moravveji at gmail.com
Sun Jun 23 17:12:49 EDT 2013

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?
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

On Sun, Jun 23, 2013 at 10:41 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> On Jun 23, 2013, at 1:09 PM, Ehsan Moravveji wrote:
> > Hello Bill,
> > Just got a chance to take a look at the way you produced a
> pulsation_info file from extras_check_model.
> > There is a difference regarding the epsilon_nuc term and its derivatives
> with the way it is implemented in /private/pulsation_info.f, and I find
> that you are subtracting the contribution from other heat sources.
> > I was expecting to have this already taken care of when s% eps_nuc(k) is
> evaluated.
> Hi Ehsan,
> It is always exciting to try to figure out what is meant by those little
> greek symbols -- "alpha" is another fun one.
> In this case "epsilon" for non-adibatic pulsation is the one in question
> -- what exactly should be included?
> I've Cc'd Rich this time in case he'd like to help us out.
> In the mesa/star energy conservation equation we have dL/dm = eps_grav +
> eps_burn
> where eps_grav = -T*Ds/Dt
> and eps_burn = eps_nuc - non_nuc_neu + extra_heat + irradiation_heat.
> eps_nuc is the energy from nuclear reactions with nuclear neutrinos
> subtracted.
> non_nuc_neu is the energy leaving as neutrinos created by
> non-nuclear-reaction sources.
> extra_heat is usually 0, but the user can specify it to do "stellar
> engineering" such as tidal heating in binary.
> irradiation_heat is also usually 0, but it can be set to model heating
> from a binary companion.
> If you are only concerned about cases in which non-nuclear neutrinos are
> irrelevant,
> and you aren't setting extra_heat or irradiation_heat, this reduces
> epsilon to eps_nuc.
> In the code I sent recently, epsilon = eps_burn.  That's what GYRE uses.
> However, as you note, there is still the question of what "epsilon" is for
> FGONG and OSC.
> When I implemented those, I was using the File Formats pdf from
> http://www.astro.up.pt/corot. (attached)
> In the "Notation" section, it says epsilon is "rate of energy generation
> per unit mass".
> In the FGONG section, it includes "epsilon" as VAR(9) at each point.
> In the OSC section, it has VAR(9) = eps_t = eps_nuc + eps_grav, nuclear
> plus gravitational energy production.
> In the mesa code in pulsation_info.f, it sets VAR(9) = eps_nuc + eps_grav.
> Bill
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Kind regards

Ehsan Moravveji
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