Do red giants have short mode lifetimes?
  We show evidence that the red giant star ksi Hya has an oscillation mode lifetime, tau, of about 2 days significantly shorter than predicted by theory (tau = 17 days, Houdek & Gough 2002). If this is a general trend of red giants it would limit the prospects of asteroseismology on these stars because of poor coherence of the oscillations. 
D. Stello, H. Kjeldsen, T. R. Bedding, D. Buzasi