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    • Keywords


      Symbiotic stars; infrared photometry; Mira variables; circumstellar dust shell; red giants; extinction; accretion disc

    • 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.

    • Author Affiliations


      A. G. Ananth1 D. A. Leahy2

      1. ISRO Head Quarters, Bangalore
      2. Institute for Space Research, Department of Physics and Astronomy, University of Calgary, Calgary NW, Alberta - T2N 1N4, Canada
    • Dates

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