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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/014/01/0037-0044

    • 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

       
      Published
      March 1993
      Manuscript received
      31 March 1992
      Accepted
      13 January 1993

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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