Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291l..42s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 291, p. L42-L46
Astronomy and Astrophysics
Astronomy
24
Infrared Stars, Interstellar Masers, Line Spectra, Stellar Envelopes, Hydroxyl Emission, Infrared Space Observatory (Iso), Giant Stars, Radio Emission, F Stars
Scientific paper
The population inversions which lead to circumstellar hydroxyl (OH) maser emission from cool stars have long been thought to be radiatively pumped. However, the proposed pumping mechanism has not been directly observed before now, because the spectral lines that correspond to the rotational transitions of the pumping cycle lie in the FIR and are unobservable from the ground. We present ISO observations of IRC+10420, obtained with its Short and Long Wavelength Spectrometers (SWS and LWS, respectively). This object is an F-type hypergiant and a strong OH maser source. The SWS spectrum clearly shows the 34.6-micron doublet in absorption, and the ensuing rotational cascade lines at 98.7, 163, and 79 microns are clearly detected in emission in the LWS spectrum. These spectra provide the first direct confirmation of the radiative pumping cycle for circumstellar OH masers.
Barlow Michael J.
Cohen Richard J.
Cox Pierre
Habing Harm J.
Lim Tanya
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