2000A&A...359..159A

The active flaring binary CC Eri was studied via multi-wavelength observations involving multi-based photometry and ground- and space-based spectroscopy. Combining early spectroscopic data with the present implies an orbital period of P=1.5615 days. Furthermore, the spectroscopic 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 its brightest-to-date phase. Two flares were detected in the ultraviolet spectral data. These flares radiated 2.7x10³¹erg and 1.6x10³¹erg in the CIV line alone, each with a total estimated radiative energy budget of ≃10³⁶erg. For the higher-temperature lines, such as CIV, there was no systematic variability with phase. The lower-temperature lines show a slight indication of rotational modulation. However, there is a much larger scatter in the individual measurements of the MgII and CIV fluxes than would be expected from measurement errors alone, consistent with an atmosphere showing continual small-scale activity.