Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..147s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 147-150.
Astronomy and Astrophysics
Astrophysics
6
Absorption Spectra, Hydroxyl Emission, Infrared Spectroscopy, Infrared Stars, Stellar Spectrophotometry, Ice, Infrared Spectra, Silicates, Stellar Envelopes, Stellar Spectra
Scientific paper
An 8-13 micron spectrum of the OH/IR source OH 138.0 + 7.3 shows the 9.7-micron absorption feature, normally identified with amorphous silicates, plus additional absorption between 10 and 12 microns. In OH/IR stars this additional absorption has previously been explained as being due to the libration band of H2O ice. However, a 2.4-3.7 micron spectrum of OH 138.0 + 7.3 shows no evidence for the 3.07 micron H2O ice absorption feature, which would be expected if this explanation is correct. Thus H2O ice cannot be responsible for this feature in OH 138.0 + 7.3. It is suggested that the feature is due to partially annealed (crystalline) silicates, and a mechanism is proposed whereby the annealing could take place in the circumstellar envelopes of OH/IR stars.
Herman Joshua
Smith Gary R.
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