  Far Ultraviolet Spectroscopic Explorer FUSE observations of the bright binary
system Capella (Alpha Aurigae; G1 III + G8 III) reveal a rich emission line
spectrum containing neutral and ionic species, among them H I, O I, C III, O
VI, S VI, Ne V and Ne VI. In addition the Fe XVIII 974.85 A line, formed at
temperatures of approx. 6 x 10^6 K, is detected. Whereas the chromospheric and
transition region emission is dominated by that from the G1 giant, consistent
with results from previous ultraviolet observations, Fe XVIII is formed largely
in the G8 giant atmosphere. Line ratios from C III suggest densities of 2-8 x
10^10 cm^-3, although anomalous line profiles of the 1176 transition may signal
optical depth effects. The hydrogen Lyman series, detected for the first time,
displays asymmetric emission consistent with an expanding atmosphere.
