Formation of OB clusters - OH maser observations

Details Formation of OB clusters - OH maser observations Formation of OB clusters - OH maser observations

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..295h&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 295-303. Research supported by the Miller Institute for Basic Researc

Astronomy and Astrophysics

Astrophysics

34

B Stars, Hydroxyl Emission, Interstellar Masers, O Stars, Star Clusters, Stellar Evolution, Astronomical Maps, H Ii Regions, High Resolution, Interstellar Matter, Molecular Clouds, Nebulae, Shock Waves, Stellar Spectrophotometry

Scientific paper

Spectral line synthesis maps of six Class I OH masers associated with compact H II regions were made with the VLA. In general, the maser spots are closely associated with a single continuum condensation. We argue that this supports the idea that complicated H II regions such as G10.6-0.4 and G19.6-0.2 are in fact excited by a cluster of OB stars. In five out of our six cases, the OH masers are located at the edges of H II regions. This appears to support shock excitation by the expanding H II region as the dominant mechanism. However, observed velocity gradients may still be consistent with bound motions such as rotation or infall.

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