Stellar Models of Betelgeuse Constrained Using Observed Surface Conditions

Abstract We study stellar models for Betelgeuse using the HR diagram and surface abundances as observational constraints. Previous studies on have not systematically investigated abundances, but we believe they can be impacted by, thus used an constraint various parameters such initial mass, rotation, overshoot scheme. investigate with varying mass evolve past main sequence, examine red supergiant (RSG) properties in detail. For each vary rotation up to ?300 km s ?1 , test two different parameters. Overall, acceptable range is 12–25 M ? nonrotating only, decreased 15–24 . Also rotating models, find that v / K = 0.3 upper limit more rapidly are unable fit Betelgeuse’s RSG. In addition, report possibilities current stage of evolution, core helium burning or carbon beyond. certain 17 could both stages. Finally, discuss implications our results context merger scenarios which been suggested a mechanism attain observed velocity Betelgeuse.