Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l..21l&link_type=abstract
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 2, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
28
Emission Spectra, Interstellar Masers, Interstellar Matter, Molecular Spectra, Water, Astronomical Spectroscopy, Infrared Stars, Radial Velocity, Radiation Sources
Scientific paper
Water emission spectra of an unusual source near Herbig-Haro (HH) 11 have been monitored over a 14-month period. Variations in the intensity and the radial velocity of the emission are noticeable on time scales as short as one day. At any given time, only one or two velocity components are present in the spectrum. The variations are such that each component appears and disappears at a fixed radial velocity, and new components appear at seemingly random velocities within a 40-km/s range. It is suggested that the exciting source is losing mass via a stellar wind and that the H2O emission arises in the transition region between the cavity created by the stellar wind and the surrounding molecular medium. The proposed model can be tested by VLBI observations; an accurate position for the H2O maser source is required to determine the physical relationship between the maser source and the infrared or HH objects.
Haschick Aubrey David
Lo Kwok Yung
Moran James Michael
Morris Marita
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