[Mesa-users] How do I change the initial_z value of a star module

[Evan Bauer]

> On Apr 8, 2018, at 5:56 AM, James via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Also, could I ask why the initial_Z is limited to 0 to 0.04? 

Hi James,

To build on what Pablo said, upgrading to the latest MESA version (10398) is almost certainly the best way to improve your situation. The basic reason that metallicity higher than 0.04 could be problematic on the main sequence for older versions of MESA is that OPAL EOS tables only go up to Z=0.04. Higher metallicity requires extrapolating off the OPAL tables or blending over into another EOS. New EOS options were introduced with release 10398 that greatly improve the EOS situation for regimes not covered by the OPAL tables.

A little more detail can be found in the release notes: https://lists.mesastar.org/pipermail/mesa-users/2018-March/008812.html <https://lists.mesastar.org/pipermail/mesa-users/2018-March/008812.html>

Cheers,
Evan
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