WR 155 and its surrounding ISM: where is the bubble?

NORMANDEAU MAGDALEN; CICHOWOLSKI SILVINA

Carilo, Argentina

Workshop; Massive Stars: Fundamental Parameters and Circumstellar Interactions; 2006

FCAGLP-UNLP

Stellar winds of massive stars seem rarely to leave easily identifiable and explained dynamical imprints on the surrounding interstellar medium. The sensible, classically-predicted wind bubbles are few and far between. As part of a concerted effort to solve the puzzle that this presents, we carefully investigate the gas and dust environment of the Wolf-Rayet star WR155, searching for indications of a stellar wind bubble and/or of a bow shock. An arc of material seen in 12CO data, faintly in infrared images, and more faintly yet in the HI images is the most likely signpost of the star´s interaction with its environment.