HD 9974: a case of a Wolf-Rayet star associated with an unusual interstellar bubble?

Details HD 9974: a case of a Wolf-Rayet star associated with an unusual interstellar bubble? HD 9974: a case of a Wolf-Rayet star associated with an unusual interstellar bubble?

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.285..253a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 285, Issue 2, pp. 253-265.

Astronomy and Astrophysics

Astronomy

18

Stars: Individual: Hd9974, Stars: Wolf-Rayet, Ism: Bubbles, Radio Lines: Ism.

Scientific paper

The neutral matter distribution from the interstellar medium local to the galactic Wolf-Rayet (WR) star HD9974 has been analysed by means of interferometric Hi 21-cm line observations. The interesting finding is an ovoid Hi minimum spanning the velocity range -43.40 to -53.30 km s^-1, created, very probably, by the joint action of the progenitor of HD9974 and the WR star itself. Inside this area of low Hi emissivity, two well-defined minima are easily seen. As seems to be the rule, the WR star is offset with respect to the geometrical centre of the main depression and the centroid of the inner minima. Based on the systemic radial velocity of the Hi void, a kinematical distance of ~4.3+/-0.9 kpc is derived. The dual Hi minimum geometry, a feature also observed in the interstellar bubbles likely to be associated with other galactic WR stars, appears to be a consequence of the interaction process itself. The shape of the main Hi cavity cannot be explained within the framework of the standard interstellar bubble theory, unless the assumption of the isotropy of the stellar wind is dropped. A simple geometrical model for the spatial distribution of the Hi is elaborated. This model can explain some of the new features (e.g. the dual-lobe appearance) observed in a few of the interstellar bubbles related to WR stars observed with high angular resolution.

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