Stellar acoustic radii and ages from seismic inversion techniques

Determining stellar characteristics such as the radius, mass or age is crucial and
asteroseismology is currently the most promising tool to provide these results accurately. We
extend the SOLA inversion technique to new global characteristics in addition to the mean
density (see Reese et al. 2012) and apply our methodology to the acoustic radius and an
age indicator based on the sound speed derivative. The results from SOLA inversions are
compared with estimates based on the small and large frequency separations for several test
cases.We show that SOLA inversions yield more accurate results than other techniques which
are more sensitive to surface effects.