When you measure the asteroseismic spectrum of a star, there are many observables: Mode frequencies, mode amplitudes, a frequency difference between modes, an envelope in frequency space where the modes have large amplitudes, and some more detailed things like even-odd-ell mode splittings and rotational splittings. Some of these observables are used in predicting or inferring stellar propeties (like mass, age, and composition) and some are not. Why not? My feeling (both from looking at the data and from thinking about the theory) is that the amplitudes of the modes (or mean amplitude over a set of modes) and the width of the envelope at nu-max are both going to be informative about stellar structure. Ana Bonaca (Harvard) and I discussed these things today, and how we might both measure and exploit this information with new data.
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