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Variations of the parameters of the dust envelope of the symbiotic star CH Cygni

Bogdanov, M. B.; Taranova, O. G.

The results of JHKLM photometry of the symbiotic star CH Cyg are presented. These demonstrate that, in Autumn 2006, the state of maximum near-IR brightness observed in 2003 2006 was replaced by a sharp brightness decline in all wavebands. One possible explanation is a sharp increase in the density of circumstellar dust envelope. The JHKLM photomet…