Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..622h&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 622-637. Research supported by the Miller Institute for Basic Resear
Astronomy and Astrophysics
Astronomy
80
B Stars, O Stars, Radio Astronomy, Star Clusters, Stellar Evolution, Antenna Arrays, Energy Spectra, H Ii Regions, Hydroxyl Emission, Interstellar Masers, Nebulae, Radio Telescopes, Stellar Mass, Synthetic Apertures
Scientific paper
Three ultracompact H II regions associated with OH masers are studied with the VLA. Multiple structures are found in each region and are interpreted as clusters of OB stars. This interpretation is supported in the case of G10.6-0.4 by a good agreement between the distribution of spectral types and the initial mass function of field stars. If the OB cluser extends to lower mass stars, we find important implications about the far-infrared characteristics of these regions and, in particular, about the deduced properties of the dust in the H II regions. Size scales and spatial distribution of the OB stars suggest that collision processes between cloud fragments must have been important in the evolution toward stars. The abundance of continuum structures also suggests that the relation between OH masers and compact H II regions may not be simple.
Haschick Aubrey David
Ho Pak Tung
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