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[6.22] FUSE Observations of the Active Cool Star: AB Dor

T. B. Ake (JHU/CSC), A. K. Dupree (CfA), J. L. Linsky (JILA), R. F. Malina (UC Berkeley), FUSE Science Team

FUSE spectra were obtained of the active cool star AB Dor (HD 36705) on 20 and 22 October 1999 during the calibration and checkout period of the satellite. Observations in this early phase of the FUSE mission were taken at a resolution of 15000 (~ 20 km s^-1) and covered the spectral range 980 -- 1180 Å. Exposures of 20000 s and 30000 s, separated by two days, enabled coverage of different phases of the 12.4 hour rotation period of this K0 dwarf. The integrated spectrum exhibits strong broadened stellar emission from C III (1176 Å) and O VI (1032, 1037 Å) corresponding to the v sin i of ~ 90 km s^-1. High temperature plasma (3 \times 10⁵ K) is clearly present. Other weaker lines are apparent, including Si III, Si IV, C I, and Fe III, demonstrating that FUSE will be an effective instrument for study of emission from cool stars.

This work is supported in part by NASA contract NAS5-32985.