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Unusual, Large-Scale, Motions in HII Regions

  • J. Meaburn
Part of the Astrophysics and Space Science Library book series (ASSL, volume 70)

Abstract

In many HII regions, huge volumes of ionized gas emit split lines. Such splitting occurs exclusively over dark areas surrounded by bright rims; these rims, which are produced by ionization fronts eating into the adjacent neutral masses, emit single lines centred on the mean motion of the nebular complex. Detailed observations of this situation are presented for the Orion (M42), Carina, Omega (M17), and 30 Doradus Nebulae. In the latter, Ca+ H and K absorption-line velocities suggest that a HI/HII shell is collapsing toward the central ionizing stars.

Keywords

Radial Velocity Optical Line Line Splitting Large Magellanic Cloud Ionization Front 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1977

Authors and Affiliations

  • J. Meaburn
    • 1
  1. 1.Department of AstronomyThe UniversityManchesterEngland

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