Asteroseismic constraints on the OPAL opacity interpolation
W. M. Yang, M. Li
TL;DR
This paper demonstrates that two-point interpolation of opacity introduces significant frequency errors in stellar models, making it unsuitable for accurately modeling solar-like stars with element diffusion.
Contribution
It highlights the limitations of two-point opacity interpolation and advocates for piecewise linear interpolation to improve stellar modeling accuracy.
Findings
Two-point interpolation causes frequency differences of several microHertz.
The errors are nearly ten times larger than observational precision.
Piecewise linear interpolation reduces errors significantly.
Abstract
The frequency difference between a model used only two-point interpolation of opacity and a model used piecewise linear interpolation of opacity is of the order of several microHertz at a certain stage, which is almost 10 times worse than the observational precision of p-modes of solar-like stars. Therefore, the two-point interpolation of opacity is unsuitable in modelling of solar-like stars with element diffusion.
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