A large HI shell surrounding the Wolf-Rayet star HD191765

ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES（1999）

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Abstract

We confirm the presence of a large shell of atomic hydrogen around the Wolf-Rayet star HD191765. The bubble is expanding at a velocity of v(exp)=9.9+/-1.65 km s(-1) and has a size of 58.5 pc x 30.0 pc for a distance of 2.1 kpc. We estimate its mass to M-HI=1904+/-730 M. and its dynamical age to 1.3 x 10(6) years. Therefore the bubble was most likely produced by the star while in its O-star main-sequence phase.

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