| |
 |
| Paper: |
Common Envelope Evolution of Massive Binary Stars : Constraints from the Quasi-Wolf Rayet Star System HD 45166 |
| Volume: |
536, The Twelfth Pacific Rim Conference on Stellar Astrophysics |
| Page: |
105 |
| Authors: |
Jeong, Y.; Yoon, S.-C. |
| Abstract: |
HD45166 is a binary system consisting of a quasi-Wolf-Rayet (qWR) star with a B7/B8 V type main sequence star in a 1.596 day orbit. The qWR component is a stripped-envelope star, of which the surface temperature is Teff = 50000 K and its inferred mass is about 3.0 − 4.0 M⊙, which corresponds to an initial mass of about 14 M⊙. It is likely that this is a post-common envelope system and, therefore, can provide important constraints on the common envelope evolution of massive binary stars. Here we present a grid of stripped-envelope stellar models having different helium core masses (MHe = 2.7 − 4.8 M⊙) and hydrogen envelope masses (MH = 0.01 − 1.0 M⊙). We find that for a given MH, the surface temperature sensitively depends on the chemical structure in the boundary layer between the helium core and the hydrogen envelope, which in turn depends on the adopted convection schemes in the models. We also find that the surface temperature of the qWR component can be explained with MH = 0.2 − 0.3 M⊙ only if a certain chemical configuration is fulfilled. We discuss implications of our results for massive binary star evolution and common envelope ejection processes. |
|
|
|
|
|
