Formation of OB clusters - CO, NH3, and H2O observations of the distant H II region complex in S128

Details Formation of OB clusters - CO, NH3, and H2O observations of the distant H II region complex in S128 Formation of OB clusters - CO, NH3, and H2O observations of the distant H II region complex in S128

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..200h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 200-205. Research supported by the University of Calif

Astronomy and Astrophysics

Astrophysics

7

B Stars, H Ii Regions, O Stars, Star Clusters, Stellar Evolution, Water Masers, Ammonia, Astronomical Maps, Astronomical Spectroscopy, Carbon Monoxide, Emission Spectra, Line Spectra, Molecular Clouds, Nebulae

Scientific paper

The spectral line emission from the 12CO, 13CO, C18O, and NH3 molecular species was mapped for the molecular cloud surrounding the S128 H II region. The 12CO map shows an elongated cloud (≡9arcmin×3arcmin) having at least two cloud components at -74 and -72.8 km s-1. A further H2O maser was detected close to the compact H II region S128N. All the signposts of star formation, the H II regions, and the H2O maser sources are found to lie along the transition between the -74 km s-1 and -72.8 km s-1 clouds, suggesting that the interaction of these two clouds may have initiated the observed star formation.

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