H2O emission from evolved stars at the far-infrared and submillimeter wavelengths

Details H2O emission from evolved stars at the far-infrared and submillimeter wavelengths H2O emission from evolved stars at the far-infrared and submillimeter wavelengths

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360l..27d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 360, Sept. 1, 1990, p. L27-L30.

Astronomy and Astrophysics

Astrophysics

26

Emission Spectra, Far Infrared Radiation, Late Stars, Stellar Evolution, Submillimeter Waves, Water Masers, Astronomical Observatories, Stellar Envelopes

Scientific paper

Intensities of far-infrared and submillimeter transitions of H2O in circumstellar envelopes of evolved stars are calculated. The radiative excitation of nu(2) and nu(3) vibrational states is taken into account. For a thick circumstellar envelope with a mass-loss rate of 0.00001 solar masses/yr, several of the strongest lines, such as the 2(12)-1(01) transition at 179.5 microns, have enough flux to be observed by the spectrometers of the Infrared Space Observatory. For the stars with lower mass-loss rate (3 x 10 to the -7th solar masses/yr), it is possible to detect a line from the sources within a distance of 300 pc with a modest integration time.

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