Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..615t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 615-618.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Photometry, Cataclysmic Variables, Infrared Stars, Light Curve, Symbiotic Stars, Cygnus Constellation, Red Giant Stars, Stellar Envelopes, Stellar Models, White Dwarf Stars
Scientific paper
The results of photometric UBVJHKLMN observations of the symbiotic star CH Cyg are presented. In 1990, an extremely deep minimum was observed in its light curve, accompanied by new activity of the hot component of this binary star. If one considers a sharp decrease in the bolometric luminosity of the red giant (M7III) of CH Cyg by about 40 percent to be impossible, then the significant drop in the star's IR brightness may be connected with the obscuration of the red giant by a dust cloud which absorbs neutrally. In this case, it is required that the optical depth of the dust envelope as a whole decrease by about 30 percent.
Taranova O. G.
Yudin Boris F.
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