The origins of neutron-capture elements in globular cluster M22

Introduction The chemical abundances of metal poor (MP) stars in globular clusters provide valuable information for constraining their evolutionary scenarios. Methods Using both main r -process and weak r -process patterns, we fit the abundances of s -poor stars in the globular cluster M22. Results and discussion The coefficients of the main and weak r -process components are nearly constant for the sample stars, including s -rich stars. By considering the contribution of the s -process from low-mass AGB stars, the abundances of s -rich stars in M22 can also be fitted effectively. Furthermore, the increasing trend in the s-process component coefficients (Cs) with increasing [Fe/H] suggests a gradual increase in the contribution from low-mass AGB stars.