3D HYDRODYNAMIC NUMERICAL MODELS FOR NEBULAE AROUND RUNAWAY WOLF-RAYET STARS

J. REYES-ITURBIDE; SCHNEITER E. MATIAS; M. ROSADO; PABLO F. VELÁZQUEZ; RAMIREZ- BALLINAS

REVISTA MEXICANA DE ASTRONOMíA Y ASTROFíSICA

UNIV NACIONAL AUTONOMA MEXICO

Lugar: México; Año: 2019 vol. 55 p. 211 - 219

0185-1101

We present 3D hydrodynamical simulations of the circumstellar bubble froma Wolf-Rayet runaway star. In the models two properties weretaken into account:(a) the proper motion of the central star through the interstellar medium (ISM)and (b) the evolution of the stellar wind from the red supergiant (RSG) stage tothe Wolf-Rayet (WR) stage. From the hydrodynamic results synthetic X-ray mapsin the [0.3−1.2] keV energy range were computed. These maps show that thebubble morphology is affected by the stellar motion, producing a bow shock inthe RSG stage that can explain the limb-brightened morphology observed. Addi-tionally, these synthetic maps show filamentary and clumpy appearance producedby instabilities triggered from the interaction between the WR wind and the RSGshell. It was found that these types of collisions can explain the origin of the X-rayemission observed in the nebulae of Wolf- Rayet stars