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Rotational modulation and flares on RS CVn and BY Dra stars. XX. Photometry and spectroscopy of CC Eri in late 1989
The active flaring binary CC Eri was studied via multi-wavelengthobservations involving multi-based photometry and ground- andspace-based spectroscopy. Combining early spectroscopic data with thepresent implies an orbital period of P=1.5615 days. Furthermore, thespectroscopic data suggests spectral types of K7 and M3 for the system.The optical photometry indicated a small spot coverage in late 1989,consistent with data taken a year later which showed CC Eri entering itsbrightest-to-date phase. Two flares were detected in the ultravioletspectral data. These flares radiated 2.7 1031 erg and 1.61031 erg in the C Iv line alone, each with a total estimatedradiative energy budget of ~ 1036 erg. For thehigher-temperature lines, such as C Iv, there was no systematicvariability with phase. The lower-temperature lines show a slightindication of rotational modulation. However, there is a much largerscatter in the individual measurements of the Mg Ii and C Iv fluxes thanwould be expected from measurement errors alone, consistent with anatmosphere showing continual small-scale activity.
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