[mesa-users] Rapidly Rotating A-Stars

[Jeremy Jones]

Hey mesa users,

I'm working on a project concerning interferometry of A-stars. Many of my
targets are rapid rotators, and I'm looking into using mesa to determine
their ages. I've played around with mesa a bit (I've included one of my
inlists below). I have a question about how to compare my observables with
the mesa outputs, in particular radius and temperature.

>From the modeling I do of the inerferometric data, I get the full radius
profile of the star (i.e. radius as a function of latitude). Likewise, I
get the full temperature profile of the star.

My question is for a rapid rotator, which radius/temperature should I
compare with the mesa outputs to get the age of the star? Polar
radius/temperature, equatorial radius/temperature, something more involved?

Thanks for any insight!

~Jeremy

The aforementioned inlist:
================
&star_job

      mesa_dir = '../..'

      set_initial_age = .true.
      initial_age = 0 ! in years

      set_initial_model_number = .true.
      initial_model_number = 0

      create_pre_main_sequence_model = .true.

      new_omega_div_omega_crit = 0.5
      near_zams_relax_omega_div_omega_crit = .true.

      pgstar_flag = .true.


/ ! end of star_job namelist


&controls

      min_timestep_limit = 1d-12 ! (seconds)

      ! check for retries and backups as part of test_suite
      ! you can delete this for use outside of test_suite
         max_number_backups = 400
         max_number_retries = 900
         max_model_number = 1500

         !max_allowed_nz = 20000 ! maximum number of grid points allowed

         initial_mass = 2
         initial_z = 0.016

         photostep = 10
         profile_interval = 10
         history_interval = 1
         terminal_interval = 2
         write_header_frequency = 10

/ ! end of controls namelist


&pgstar

History_Track1_win_flag = .true.
History_Track1_yname = 'log_R'
History_Track1_yaxis_label = 'log(R/R_sun)'
History_Track1_xname = 'log_Teff'
History_Track1_xaxis_label = 'log(T/K)'
History_Track1_title = 'Radius vs. Effective Temperature'

History_Track2_win_flag = .true.
History_Track2_yname = 'surf_avg_v_rot'
History_Track2_yaxis_label = 'Equatorial Velocity (km/s)'
History_Track2_xname = 'star_age'
History_Track2_xaxis_label = 'Age (yr)'
History_Track2_title = 'Surface Velocity vs. Age'

/ ! end of pgstar namelist
================

-- 
Jeremy Jones
Graduate Student Assistant
Georgia State University
Department of Physics & Astronomy
jones at chara.gsu.edu
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