S 308: A Textbook Example of Wolf-Rayet Bubbles

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

Wolf-Rayet (WR) stars are evolved massive stars whose H-rich envelopes have been stripped by copious stellar winds at a red supergiant (RSG) or luminous blue variable (LBV) phase. The fast WR wind can sweep up the circumstellar material and form a bubble. Hydrodynamical models of WR bubbles have been calculated both analytically and numerically by García-Segura, Mac Low, and Langer.
S 308 is a circumstellar bubble blown by the WN4 star HD 50896. It is one of the only two WR bubbles that have been detected in X-rays. XMM-Newton observations of the northwestern quadrant of S 308 show X-ray emission in the bubble interior, but an apparent gap exists between the outer edge of the X-ray emission and the outer rim of the [O iii] λ 5007 emission.
We have obtained high-dispersion, long-slit echelle spectra of S 308 in the Hα , [N ii] λ 6583, and [O iii] λ 5007 lines. The echelle spectra reveal a thick shell of expanding RSG wind with an outer shock advancing into the ambient interstellar medium and an inner rim of swept-up RSG wind. We have also obtained additional XMM-Newton observations to map the entire bubble of S 308. The X-ray mosaic image of S 308 shows that the hot gas is confined within the innermost swept-up RSG wind shell. These results indicate that S 308 is a textbook example of WR bubbles modeled by García-Segura et al. Our upcoming FUSE observations of O vi line emission from S 308 will further allow us to investigate the thermal conduction between the cold nebular shell and the hot interior gas.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

S 308: A Textbook Example of Wolf-Rayet Bubbles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with S 308: A Textbook Example of Wolf-Rayet Bubbles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and S 308: A Textbook Example of Wolf-Rayet Bubbles will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1643378

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.