The Effect Of Superwind Mass Loss On Abundances Of Metal-Poor AGB Stars

Based on the parametric TP pulse model,we add superwind mass loss and take the initial mass of 1.5M_⊙,2M_⊙and3M_⊙respectively to fit the surface abundances of three lead-rich stars(HD187861, HD196944 and HD224959) and two very metal-poor stars(LP625-44 and LP706-7).As a result,we get a good fit to the observed abundances whether the reaction branchings are taken into account or not. And we find out that,with superwind mass loss, the mean neutron exposure of three lead-rich stars are larger than 2 (mb)^-1 and about 80% of substance in the He intershell will experience s-process repeatebly.But for the other two metal-poor stars,the effect of superwind mass loss can be negligible.