[mesa-users] create He stars by create_zams

Ying Qin Ying.Qin at unige.ch
Tue May 24 17:20:25 EDT 2016

Dear Bill,

Thank you for your quick reply.
I will try the method and let you know what happens.


On 24 May 2016, at 23:11, Bill Paxton <paxton at kitp.ucsb.edu<mailto:paxton at kitp.ucsb.edu>> wrote:


create_zams is the wrong tool for the job.

if you are aiming for much larger masses, i suggest taking a look at the test case make_massive_with_uniform_composition.
you can set the target composition by editing the inlist.  it creates a C/O mix currently with these parameters.

         ! C/O MIX
         ! set target uniform composition for relax_initial_to_xaccrete
         num_accretion_species = 2
         accretion_species_id(1) = 'c12'
         accretion_species_xa(1) = 0.1582d0
         accretion_species_id(2) = 'o16'
         accretion_species_xa(2) = 0.8418d0

For pure He4, you'd change this to
         ! He4
         ! set target uniform composition for relax_initial_to_xaccrete
         num_accretion_species = 1
         accretion_species_id(1) = 'he4'
         accretion_species_xa(1) = 1d0

set initial_mass to whatever you want.

Give it a try -- you'll be the 1st person to try this as far as I know, so let us know what happens.


On May 24, 2016, at 1:52 PM, Ying Qin wrote:

Hi there,

By default, we can evolve a helium star directly by calling a model zams_z2m2_y98.data , which can create a mass range from 3.25 - 18.25 Msun.
However, I am trying to create a much larger mass range of helium star by using create_zams. Unfortunately, mesa can only create
the mass range of  ~3 - ~20Msun, and it failed due to ’stopping because of convergence problems — too many retries’.
Could any users have this similar problem or help me out ? Any comments are welcome, thank you in advance.

BTW, I am using mesa-r8118 with the latest mesasdk. Inlist and the unsuccessful z2m2_y98.data are attached below.

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