An example optimisation run of the
astero module, based on the
CoRoT target HD 49385. This is the usual starting point if you want
to optimise model parameters using the
astero module. This test
case was introduced in Sec. 3.2 of MESA II and uses the
observational constraints presented by Deheuvels et al. (2010) and
analysed by Deheuvels & Michel (2011). The
test uses the effective temperature, metallicity and mode frequencies
of angular degree 0, 1 and 2.
For speed, the test case only runs the initial parameters set by
first_*. To optimse the model parameters, change
to one of the search options.
The test fails if the total \(\chi^2\) is not between 1 and 15. Mode frequencies are quite sensitive to microphysics like opacity tables, nuclear reaction rates and the equation of state, so changes to those modules can eventually push \(\chi^2\) above 15, triggering failure. This is usually resolved by re-optimising the model.
If \(\chi^2\) is smaller than zero, then \(\chi^2\) was never successfully evaluated. The only possible negative value should be the placeholder initial value of -1.
Finally, if \(\chi^2\) is between zero and one, the test fails because that sounds too good to be true!
Last-Update: 2020-11-13 (mesa r14889) by Warrick Ball