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Ultraviolet observations of stellar coronae : early results from HST.
Linsky, Jeffrey L.
The first GHRS spectra of two very different late-type giant stars - Capella and Gamma Dra are reported. Capella is a 104 day period binary system consisting of two stars (G9 III and GO III) each of which shows bright emission lines formed in solar-like transition region and coronae. By contrast, Gamma Dra is a hybrid-chromosphere star with very w…
M ¥± Line Variation of 32 Cygni
Kang, Young Woon
The Mg ¥± lines have been extracted from the IUE archival spectra of 32 Cygni to investigate the effect of the atmospheric eclipse. The UV light curve has been reduced from the continuum flux at the center wavelength of 2807.5 Å in the IUE spectra. The equivalent width of the Mg ¥± k absoption line has been measured for each spectra. The results o…
Emission Line Variability in AGN's.
Kollatschny, W.
The Hipparcos space mission - A revolution in astronomy
Schuyer, Maurice
The Hipparcos mission to establish an accurate catalog of stellar atmospheric parameters for about 120,000 selected stars is presented. The selected stars cover a range that extends from magnitude -1.5 (for the brightest) to magnitude +12 (for the faintest). The scientific payload and the mission profile of the satellite, and the recent status of …