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AB Dor in '94: I. HST/GHRS Observations of the Quiescent Chromosphere of an Active Star
J. C. Brandt, S. R. Heap, F. M. Walter +15
We analyze HST/GHRS spectra of AB Doradus, the prototypical ultra-rapidly rotating K dwarf. We observed chromospheric (Mg II) and transition region (C II, Si IV, C IV, and N V) lin…
Observational Estimates for the Mass-Loss Rates of Alpha Centauri and Proxima Centauri Using HST Lyman-alpha Spectra
Brian E. Wood, Jeffrey L. Linsky, Hans-Reinhard Mueller +1
We study H I Lyman-alpha absorption observed by the Hubble Space Telescope toward the nearby binary system Alpha Cen (G2 V+K0 V) and its distant companion star Proxima Cen (M5.5 Ve…
The Mg II and Lyman-alpha Lines of Nearby K Dwarfs: ISM Components and Flux Measurements
Brian E. Wood, Carol W. Ambruster, Alexander Brown +1
We analyze local ISM absorption observed in the Lyman-alpha and Mg II h & k lines of six nearby K dwarf stars, using UV spectra of these stars obtained with the Goddard High Resolu…
FUSE Observations of the Active Cool Star AB Doradus
T. B. Ake, A. K. Dupree, P. R. Young +5
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 pha…
The Ionization of the Local Interstellar Medium, as Revealed by FUSE Observations of N, O and Ar toward White Dwarf Stars
E. B. Jenkins, W. R. Oegerle, C. Gry +10
FUSE spectra of the white dwarf stars G191-B2B, GD 394, WD 2211-495 and WD 2331-475 cover the absorption features out of the ground electronic states of N I, N II, N III, O I and A…
Heliospheric, Astrospheric, and Insterstellar Lyman-alpha Absorption Toward 36 Oph
Brian E. Wood, Jeffrey L. Linsky, Gary P. Zank
We use high-resolution UV spectra taken by the Space Telescope Imaging Spectrograph instrument on board the Hubble Space Telescope to study the 5.5 pc line of sight to the K0 V sta…