Ground-based asteroseismoloy : what next%3F
B. Mosser

Abstract: Asteroseismology, an efficient tool for probing stellar interiors, can provide decisive observational constraints on stellar evolution theory. It requires therefore long duration uninterrupted observations, what can be achieved in space with photometry (as CoRoT). On the other side, current ground-based observations are both limited in duration and duty cycle. The next step in ground-based asteroseismology requires then network observations, or observation from Dome-C in Antarctica, as proposed by the SIAMOIS project (http:--siamois.obspm.fr-) with a 40-cm telescope. This site provides a unique duty cycle, about 90%25 for 3-month long observations. , , Ground-based spectrometric observations are required since they able to detect low-frequency oscillation modes of longer lifetimes than detected with intensity observation. Longer mode lifetimes imply more accurate frequencies, leading to more accurate structure inversions. Furthermore, the Doppler signal give access to l=3 modes, when photometric observations are limited to l=2. , , The SIAMOIS concept, based on Fourier Transform interferometry, makes it possible to feed the instrument with many fibres, for the simultaneous observation of multiple targets. With a 4-m telescope as the CFHT, in network with similar collectors at complementary longitudes, it could give access to nearby open clusters, one of the most promising steps of asteroseismology.