[Mesa-users] STELLA Errors and Number of Frequency Bins

[Jake Nicoll]

Hi all,

I am running STELLA in the 12778 version of MESA with the mesa.abn and mesa.hyd files created using the example_make_pre_ccsn and example_ccsn_IIP test suite cases (with certain parameters adjusted for specific cases). I am trying to use more frequency bins to better fit individual U, B, V, R, and I color curves to observational data. However, I sometimes encounter errors which disappear when using fewer bins.

For example, I successfully ran STELLA with the attached mesa.hyd and the mesa.abn files with 400 spatial zones and 120 frequency bins. However, when I tried to use 150 frequency bins, I received the error: "0Matrix is numerically singular-decomposition aborted", and STELLA failed to run.

I have also received error messages which read "Segmentation fault, invalid memory reference" for other sets of .abn and .hyd files. I am not sure if these error messages are related, but I have worked around both of them by reducing the number of frequency bins I run with.

I am wondering if someone can help me understand these errors and let me know if there is a way to work around them that does not involve using fewer frequency bins.

Best,
-Jake Nicoll
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