[Mesa-users] Hydrogen core mass and radius

Roque Caballero Navarro rcaballeron at hotmail.com
Thu Aug 23 07:41:57 EDT 2018

Hi Aaron,

   I understand, many thanks for the explanation. In my next simulation I'll plot the suggested parameters.

Kind regards,


De: Aaron Dotter <aaron.dotter at gmail.com>
Enviado: jueves, 23 de agosto de 2018 11:04
Para: Roque Caballero Navarro
Cc: pedro.david.gomes at ist.utl.pt; Josiah Schwab; mesa-users
Asunto: Re: [Mesa-users] Hydrogen core mass and radius

Hi Roque,

      !h_rich_layer_mass ! = star_mass - he_core_mass
      !he_rich_layer_mass ! = he_core_mass - c_core_mass
      !c_rich_layer_mass ! = c_core_mass - o_core_mass
      !o_rich_layer_mass ! = o_core_mass - si_core_mass
      !si_rich_layer_mass ! = si_core_mass - fe_core_mass

I'm wondering if the mass of the hydrogen core (similarly for the radius) can be derived by subtracting the star mass the masses of the other cores (He, C, O, Si and Fe)

No, it cannot.  The other cores refer to later stages of nuclear burning after the H in the core has been exhausted.  If you try plotting them, you'll see they're all zero during core H-burning (main sequence).

For example, the he_core_mass can be defined because there is a region of the star that is free of H.  In the case of core H-burning, we cannot simply perform a test on the presence or absence of an element because there is H throughout the star.

Are you using profiles or the history file?  In the profile you might consider plotting the luminosity from H-burning (log_LH or similar) and see how it changes with radius and mass.

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