A list of IRAS detections of RS CVn-type binaries, according to the revised version of the Point Source Catalogue, is presented. Selected samples of the data are compared to the expected colour sequences for normal giant stars as well as to the flux ratios typical of black body emission at various temperatures. In both cases, some (but not all) of the sources show evidence of an IR excess, indicating that RS CVn variables do not behave in a unique way at IR wavelengths. The excess, when present, is not correlated with the activity level nor with the evolutionary status and its origin still calls for an explanation, perhaps in terms of mass-loss phenomena near the Main Sequence.
IR excesses of RS CVn-type binaries from IRAS observations
BUSSO, Maurizio Maria;
1987
Abstract
A list of IRAS detections of RS CVn-type binaries, according to the revised version of the Point Source Catalogue, is presented. Selected samples of the data are compared to the expected colour sequences for normal giant stars as well as to the flux ratios typical of black body emission at various temperatures. In both cases, some (but not all) of the sources show evidence of an IR excess, indicating that RS CVn variables do not behave in a unique way at IR wavelengths. The excess, when present, is not correlated with the activity level nor with the evolutionary status and its origin still calls for an explanation, perhaps in terms of mass-loss phenomena near the Main Sequence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.