Infrared observations of symbiotic stars |
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Authors: | A G Ananth D A Leahy |
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Institution: | (1) ISRO Head Quarters, Bangalore;(2) Institute for Space Research, Department of Physics and Astronomy, University of Calgary, Calgary NW, T2N 1N4 Alberta, Canada |
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Abstract: | Near infrared measurements in the J, H and K bands have been carried out for a number of symbiotic stars with the 1.5 m telescope
at the Rothney Astrophysical Observatory (RAO). A comparison with the earlier observations shows that the S-type symbiotic
stars do not have any significant variation in the infrared flux over the past five years. However a small variation ∼ 0.3
magnitude in the infrared flux has been detected for CH Cygni. The observations of HM Sagittae show large decreases in the
infrared flux compared to the previous measurements. The variability in the infrared fluxes of both these objects could be
attributed to a variation in the temperature due to the cooling of the dust shell. The variability observed for V1016 Cygni
is found consistent with the previous measurements. |
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Keywords: | Symbiotic stars infrared photometry Mira variables circumstellar dust shell red giants extinction accretion disc |
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