  Far ultraviolet spectra were obtained of the active cool star AB Doradus (HD
36705) during the calibration and checkout period of the FUSE satellite.
Observations in this early phase of the mission were taken at a resolving power
of 12000-15000 (~20-25 km/s) and covered the spectral range 905-1187 A. The
integrated spectrum exhibits strong, rotationally broadened stellar emission
from C III (977, 1175) and O VI (1032, 1037), and many weaker lines. Strong
emission lines of C III and O VI exhibit broad wings. The C III 977 profile
shows blue-shifted absorption at ~30 km/s and C II 1036 absorption appears
superposed on emission in the wing of O VI 1037. Rotational modulation of C III
and O VI is present, in harmony with its photometric variability. Flares were
detected in the brightest lines and subexposures were analyzed to examine flux
and profile variations. Downflows that extend to 600 km/s during a flare are
found in the O VI profiles. These early observations demonstrate that FUSE will
be an exceptional instrument for studying chromospheres in cool stars.
