New H2O maser near NGC7538

Details New H2O maser near NGC7538 New H2O maser near NGC7538

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.262..564g&link_type=abstract

Nature, vol. 262, Aug. 12, 1976, p. 564-566.

Astronomy and Astrophysics

Astronomy

14

Absorption Spectra, Infrared Astronomy, Interstellar Masers, O Stars, Radio Sources (Astronomy), Water Masers, Electromagnetic Radiation, H Ii Regions, Hydroxyl Emission, Optical Thickness, Photon-Electron Interaction, Radial Velocity, Stellar Envelopes, Water Vapor

Scientific paper

A new, strong water vapor maser has been observed near the H II region of NGC7538. The radio source is NGC7538-B. The main component of the H2O source has a radial velocity of -60.8 plus or minus 0.2 km/sec. Observations of the source reported in the literature are reviewed, and a schematic model is constructed. The geometry of the source is simple, with a single exciting star - probably of spectral type O6 - surrounded by a compact H II region and a dense dust shell. It is suggested that the object may be a useful prototype for the study of newly formed O stars and of H2O masers in general.

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