Authors:
Amado P.J., Doyle J.G., Byrne P.B., Cutispoto G., Kilkenny D., Mathioudakis M., Neff J.E.
Journal:
Astronomy and Astrophysics
Abstract:
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 2.71031 erg and 1.61031erg in the CIV line alone, each with a total estimated radiative energy budget of ≈ 1036 erg. 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 Mg II and C IV fluxes than would be expected from measurement errors alone, consistent with an atmosphere showing continual small-scale activity.
Keywords:
Stars: activity; Stars: binaries: spectroscopic; Stars: chromospheres; Stars: individual: CC Eri; Stars: late-type; Ultraviolet: stars