The 10 Micron Silicate Feature of Comet C/1996 Q1 (Tabur)
作者： David E. Harker , Charles E. Woodward , Diane H. Wooden , Fred C. Witteborn , Alan W. Meyer
DOI: 10.1086/301011
关键词: Spectral line 、 Pyroxene 、 Silicate 、 Olivine 、 Physics 、 Astronomy 、 Analytical chemistry 、 Infrared 、 Amorphous solid 、 Comet 、 Spectral resolution 、 Space and Planetary Science 、 Astronomy and Astrophysics
摘要: We present 7.6–13.2 μm infrared spectrophotometry (R 120) of the inner coma comet C/1996 Q1 (Tabur), obtained 1996 October 8–10 UT. At this epoch, was at a heliocentric distance rh = 0.96 AU. The local 10 continuum is fitted with 300 ± K blackbody, revealing weak silicate feature. Our analysis suggests that Tabur most likely contains large grains radii ≈ 1–3 μm. Synthetic spectra derived from laboratory measurements amorphous pyroxene and crystalline olivine grain sizes (radii) between 1 5 are to Tabur's emission A mixture (1 radii) (3 provides best model fit observed spectrum. also compare mid-IR C/1995 O1 (Hale-Bopp) other comets without features. In particular, we discuss spectrum C/1998 K5 (LINEAR) on 1998 June 28–30 UT same instrument spectral resolution. contrast Tabur, LINEAR does not exhibit in excess featureless characterized by 310 blackbody.
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