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Infrared observations of RS CVn starsThe paper presents infrared photometry of the RS CVn binary stars AR Lac (1.2-10 microns) and MM Her (1.2-3.5 microns) as they egressed from their primary and secondary eclipses; of the eclipsing systems RS CVn and Z Her at maximum light (1.2-10 microns) and of the non-eclipsing systems UX Ari and HR 1099 (1.2-10 microns). An analysis of these and published V data based on flux ratio diagrams (linear analogues of color-color diagrams) shows that G and K stars supply the infrared light of these systems. In AR Lac, the combined light of a G5-K0 subgiant and either a late F dwarf or an early F subgiant can account for the observed visual and infrared light curves. None of these systems shows infrared emission from circumstellar matter. This result is simply understood: dust grains would not be expected to form in the physical conditions surrounding the subgiant, and the corona and chromosphere (whose properties have been deduced from spectroscopic X-ray observations) should not produce appreciable infrared emission.
Document ID
Document Type
Reprint (Version printed in journal)
Berriman, G.
(California Inst. of Tech. Pasadena, CA, United States)
De Campli, W. M.
(California Inst. of Tech. Pasadena, CA, United States)
Werner, M. W.
(California Institute of Technology Pasadena, CA, United States)
Hatchett, S. P.
(NASA Ames Research Center Moffett Field; California, University, Berkeley, CA, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1983
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 205
ISSN: 0035-8711
Subject Category
Accession Number
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