S 106 - an H II-region driven by a stellar wind

Astronomy and Astrophysics – Astrophysics

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H Alpha Line, H Ii Regions, Interstellar Gas, Stellar Winds, Density Distribution, Emission Spectra, Pressure Gradients, Velocity Distribution

Scientific paper

High resolution interferometric observations of the forbidden S III 9531 A line emitted by the peculiar emission nebula S 106 are presented. Observations were carried out with a Fabry-Perot scanner attached to the 1.2 m telescope of the Calar Alto Observatory in June and October 1979. Obtained profiles are broad, some covering a radial velocity range exceeding 100 km/s, and asymmetric around their peak intensity. Profiles in the north emission lobe show an excess of positive over negative velocity, while those in the south lobe exhibit the reverse asymmetry; velocity centroids define a kinematic distance between 0.5 and 1.0 kpc. Measured line intensities and 6-cm flux densities show the line formation path length to be 1/100 of the nebular dimensions on the plane of the sky. It is suggested that the nebular spectrum originates in a thin layer of gas confined by stellar wind from the exciting star to the surface of a two-lobe cavity. The nearly symmetric appearance of the nebula is attributed to the density distribution prevailing within the disk-like complex of interstellar matter in which the single exciting star was formed.

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