Near infrared photometry of some RS CVn systems and candidates |
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| Authors: | R. P. Verma S. K. Ghosh K. V. K. Iyengar T. N. Rengarajan S. N. Tandon R. R. Daniel N. B. Sanwal |
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| Affiliation: | (1) Tata Institute of Fundamental Research, Bombay, India;(2) Centre of Advanced Study in Astronomy, Osmania University, Hyderabad, India;(3) Present address: Smithsonian Astrophysical Observatory, Cambridge, USA |
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| Abstract: | Infrared observations in the J, H, and K bands were made on eleven RS CVn systems. Infrared (IR) excess  0.3 mag in the J, H, and K bands was observed from the three systems UX Ari, HR 1099 and  CrB. Similar observations were also made on the RS CVn candidates HD 26354, 39937, 42449, 51268, and 86005.The IR excess in the RS CVn systems for which near infrared photometric data are available is found to be correlated with the maximum of optical wave amplitude of these systems.The observed excess cannot be explained on the basis of a single process such as: (i) emission from cool spots on the photosphere; (ii) free-free emission from an optically thin circumstellar plasma; or (iii) dust grain emission from circumstellar material.On leave from TIFR, Bombay, India. |
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