(the following information provided by Dr. Pierre Chayer)
Drs. Martin Laming (Naval Research Laboratory), Jeremy Drake (SAO), and Kenneth Widing (Naval Research Laboratory) obtained and analyzed the EUV spectrum of the K2 dwarf star, Epsilon Eridani, recorded by the Extreme Ultraviolet Explorer satellite (EUVE).
Because the EUVE spectrometer has a sufficient resolution and sensibility to allow studies of elemental abundances in stellar coronae based on individual spectral lines, Dr. Laming's team identified many lines from different elements in the spectrum of Epsilon Eridani. They used the measured relative intensities of these lines to investigate the emission measure (EM) distribution and the coronal element abundances in order to determine whether the FIP effect is operating or not in Epsilon Eridani. The FIP effect is observed in the solar corona where elements with low first ionization potential (FIP) (less or equal to 10 eV) are overabundant by average factors of about 4 compared with elements with high FIP ( > 10 eV).
The EUVE data suggest that a solar-like FIP effect is in operation in Epsilon Eridani, although the limited number of high-FIP lines detected, together with the sharply peaked shape of the EM distribution and low signal-to-noise ratio of the spectra, preclude a definitive judgement according to Dr. Laming's group. However, they can conclude that there cannot be an enhancement of low-FIP species in the corona of Epsilon Eridani significantly larger than that seen in the average solar corona, which may imply that the magnitude of the FIP effect does not seem to increase with increasing stellar activity.
Figure 1 (94 Kb post-script):Spectrum of Epsilon Eridani from the EUVE medium wavelength spectrometer (MW).