[Mesa-users] Astero: delta_nu with a single radial frequency

[Earl Bellinger]

Hi Jacqueline,

I haven't checked, and this is only a guess, but is it possible that it's
using the asymptotic value? That is:
    Delta_nu/Delta_nu_solar = sqrt(M/R**3)
with M and R being in solar units and Delta_nu_solar ~= 135.1 muHz.

Best regards,
Earl


On Tue, Oct 8, 2019 at 6:17 AM Jacqueline Goldstein via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi MESA users,
>
> How does the astero module determine/use delta_nu when only provided a
> single radial frequency?
>
> In my inlist, I am only using first values and only using aster-seismic
> constraints.
> The radial frequency is:
>
>   chi2_seismo_fraction = 1d0          # only seismic constraints
>   normalize_chi2_spectro = .false.  #need when chi2_seismo_fraction = 1.
>
>
>   nl0 = 1 ! number of observed l=0 modes
>
>   l0_obs(1) =  66.704 !                     # microhertz
>   l0_obs_sigma(1) = 0.001
>
>   l0_n_obs(1) = 1                            # radial order
>
>
> I have three additional dipole frequencies.
>
> I am leaving the default value of
>
> delta_nu = -1
> delta_nu_sigma = -1
>
>
> The module runs, but how does the astero module treat delta_nu with this
> single radial frequency?
>
> In astero_support.f I see:
>
> if (delta_nu <= 0 .and. nl0 > 1 .and. l0_n_obs(1) > 0) then…
>
> But I can’t determine what happens when delta_nu <=0 I only have a single
> radial frequency.
>
> Sincerely,
>
> Jacqueline Goldstein
> PhD Graduate Student | Astronomy
> University of Wisconsin - Madison
> http://www.astro.wisc.edu/~jgoldstein
>
>
>
>
>
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