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Convection in stars excites resonant acoustic waves which depend on the soundspeed inside the star, which in turn depends on properties of the stellarinterior. Therefore, asteroseismology is an unrivaled method to probe theinternal structure of a star. We made a seismic study of the metal-poorsubgiant star nu Indi with the goal of constraining its interior structure. Ourstudy is based on a time series of 1201 radial velocity measurements spreadover 14 nights obtained from two sites, Siding Spring Observatory in Australiaand ESO La Silla Observatory in Chile. The power spectrum of the high precisionvelocity time series clearly presents several identifiable peaks between 200and 500 uHz showing regularity with a large and small spacing of 25.14 +- 0.09uHz and 2.96 +- 0.22 uHz at 330 uHz. Thirteen individual modes have beenidentified with amplitudes in the range 53 to 173 cm/s. The mode damping timeis estimated to be about 16 days (1-sigma range between 9 and 50 days),substantially longer than in other stars like the Sun, the alpha Cen system orthe giant xi Hya.

Solar-like oscillations in the metal-poor subgiant nu Indi: II. Acoustic spectrum and mode lifetime