Infrared observations of RS CVn stars.
Abstract
The 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 1983
- DOI:
- 10.1093/mnras/205.3.859
- Bibcode:
- 1983MNRAS.205..859B
- Keywords:
-
- Eclipsing Binary Stars;
- Infrared Astronomy;
- Light Curve;
- Stellar Spectrophotometry;
- Astronomical Photometry;
- Chromosphere;
- Color-Color Diagram;
- F Stars;
- Infrared Photometry;
- Infrared Radiation;
- K Stars;
- Radiant Flux Density;
- Stellar Color;
- Stellar Coronas;
- Astronomy