Interiors

Introduction

Each MESA dataset is stored as a single ASCII CSV table. See the header of the file for a description of its columns. The dataset is based on a grid of MESA models for different initial masses. A ZIP archive with the corresponding inlist files is provided as well. Refer to the attached Python Jupyter notebook for an example of parsing the data file and plotting isochrones and evolutionary tracks.


Omega Cen with MIST and NextGen

MESA settings mostly adopted from the MIST project (Dotter+2016). Atmospheric boundary conditions replaced with those derived from the NextGen PHOENIX grid (See France Allard's website), which offers a slight improvement in the accuracy of synthetic photometry over the default MIST boundary conditions and a considerable improvement over simple photospheres. The mass sampling was approximately tuned to produce models with effective temperatures varying from 1700 K to 6000 K in steps of 100 K. The attached archive contains both MESA inlist files and updated boundary conditions. Note that the inlist files are only useable within the MIST setup of MESA, which is publicly available here.

Mass range (solar masses) 0.067281 - 0.527273
Maximum age 13.5 GYr
Metallicity [Fe/H] -1.7
Helium mass fraction 0.4
Abundance enhancements (CNO in dex) -0.65, +1.45, -0.1
Download dataset Download link (11.3 MB)
Download control files Download link (275.2 KB)

Omega Cen with simple photospheres

Mostly default MESA settings. The boundary conditions are guessed by assuming constant opacity in the outer layers (see Paxton+2010). The grid serves as a good approximation throughout, but fails to deliver accurate synthetic photometry at subsolar temperatures.

Mass range (solar masses) 0.04 - 0.6
Maximum age 13.5 GYr
Metallicity [Fe/H] -1.7
Helium mass fraction 0.4
Abundance enhancements (CNO in dex) -0.65, +1.45, -0.1
Download dataset Download link (12.5 MB)
Download control files Download link (113.9 KB)