Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..243c&link_type=abstract
Publications of the Astronomical Society of Japan, vol.53, no. 2, p. 243-250.
Astronomy and Astrophysics
Astronomy
23
Crystalline Silicate, Ism: Dust, Extinction, Ism: Lines And Bands, Laboratory Experiment, Line: Profiles
Scientific paper
The far-infrared absorption spectra of crystalline circumstellar dust analogues (orthoenstatite, clinoenstatite, diopside, and forsterite) were measured at room temperature (295 K) and liquid-helium temperature (4.2 K). The wavelength ranges of the measurements were 20-80 µm and 30-80 µm at 295 K and 4.2 K, respectively. The absorption bands were detected very clearly not only at room temperature, but also at liquid-helium temperature. The temperature effects were clearly observed at liquid-helium temperature, such as (1) an increase in the spectral index of the continuum, (2) an enhancement in the absorption band strength, (3) a decrease in the band width, and (4) the absorption peaks of all bands of all samples shifted toward a shorter wavelength. These results suggest that a reconsideration of the identification should be required for some absorption bands which have been recognized as unidentified bands because of a disagreement in the peak position between the observed data and the laboratory data obtained at room temperature. Our experimental data can be obtained from the web-site (http://www.kyoto-phu.ac.jp/labo/butsuri/).
Chihara Hiroki
Koike Chiyoe
Tsuchiyama Akira
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