Unusual infrared fading of CH Cygni in 2006 |
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| Authors: | O G Taranova V I Shenavrin |
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| Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia |
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| Abstract: | Infrared observations of the unique symbiotic system CH Cyg in 2003–2006 are presented. Analysis of the observations has shown that a fairly dense dust structure (a cloud or a shell) appeared on the line of sight in August–November 2006. The dust grains in the new shell are similar in optical properties to graphite ones and their sizes are mostly within the range 0.14–0.16 µm. The dust shell is optically thick and its optical depth at 2.2 µm is τ(2.2) ≈ 0.97. The dust shell mass is M d(06) ≈ 8 × 10?6 M ⊙ and the rate of matter flow into the shell has reached ～2 × 10?5 M ⊙ yr?1. |
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| Keywords: | symbiotic stars IR photometry variability dust shells |
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