Ó Ööö Òø× Úú ××óöø Ñó Ððððøøññ××
نویسندگان
چکیده
We show evidence that the red giant star ξ Hya has an oscillation mode lifetime , τ, of about 2 days significantly shorter than predicted by theory (τ = 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.