Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202...81l&link_type=abstract
Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 81-91. NSF-supported research.
Astronomy and Astrophysics
Astronomy
106
Interstellar Matter, Radio Sources (Astronomy), Star Formation, Water Vapor, Emission Spectra, H Ii Regions, Line Spectra, Main Sequence Stars, Molecular Spectra, Nebulae, Spatial Distribution
Scientific paper
Regions and objects believed to be in early stages of stellar formation have been searched for H2O 22-GHz line emission with the Haystack 120-foot telescope. The objects include radio condensations, infrared objects in H II regions, and Herbig-Haro objects. Nine new H2O sources were detected in the vicinity of such objects, including the Sharpless H II regions S152, S235, S255, S269, G45.1 + 0.1, G45.5 + 0.1, AFCRL infrared object No. 809-2992, and Herbig-Haro objects 1 and 9. The new H2O sources detected in H II regions are associated, but not coincident, with the radio condensations. Water vapor line emission was detected in 25 per cent of the regions searched. The association of H2O sources with regions of star formation is taken to be real. The spatial relationship of H2O sources to infrared objects, radio condensations, class I OH sources, and molecular clouds are discussed. The suggestion is made that an H2O source may be excited by a highly obscured star of extreme youth.
Burke Bernard F.
Haschick Aubrey David
Lo Kwok Yung
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