Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..127g&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 127-131.
Astronomy and Astrophysics
Astrophysics
15
H Ii Regions, Stellar Envelopes, Stellar Winds, Wolf-Rayet Stars, Interferometry, Kinematics, Line Spectra, Oxygen Spectra, Radial Velocity
Scientific paper
The results of a kinematic study of NGC 2359, from 21 interferometric profiles of [O III] λ5007 and [N II] λ6583, are presented. All profiles share a component at VLSR=54 km s-1, identified with the systemic velocity. Over the central core, [O III] shows components at ±30 km s-1 from the centroid, not seen in [N II]. The relative intensities of the displaced components indicates their origin in tenuous gas seen pervading bright filaments, which move nearly with the systemic velocity. It is proposed that the tenuous gas is an expanding shell driven by the stellar wind from the exciting WR-star, while the filaments are post-shock manifestations of density fluctuations in the external medium overrun by the shell. The problems offered by the joint interpretation of optical and microwave CO line data are reconsidered and possible avenues to their solution are suggested.
Goudis Ch.
Hippelein H. H.
Muench Gus
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