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

[Jacqueline Goldstein]

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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