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We introduce a new method to measure frequency separations and mode lifetimesof stochastically excited and damped oscillations, so-called solar-likeoscillations. Our method shows that velocity data of the red giant star ksi Hya(Frandsen et al. 2002) support a large frequency separation between modes ofroughly 7 microHz. We also conclude that the data are consistent with a modelifetime of 2 days, which is so short relative to its pulsation period thatnone of the observed frequencies are unambiguous. Hence, we argue that themaximum asteroseismic output that can be obtained from these data is an averagelarge frequency separation, the oscillation amplitude and the average modelifetime. However, the significant discrepancy between the theoreticalcalculations of the mode lifetime (Houdek & Gough 2002) and our result based onthe observations of ksi Hya, implies that red giant stars can help us betterunderstand the damping and driving mechanisms of solar-like p-modes byconvection.Comment: 9 pages, 11 figures, accepted for publication in A&

Oscillation mode lifetimes inξHydrae: will strong mode damping limit asteroseismology of red giant stars?