Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..795w&link_type=abstract
Astronomical Journal, vol. 83, July 1978, p. 795-815.
Astronomy and Astrophysics
Astronomy
30
Binary Stars, Lyman Alpha Radiation, Magnesium, Satellite Observation, Stellar Spectra, Chromosphere, Interstellar Matter, Oao 3, Spaceborne Astronomy, Stellar Spectrophotometry
Scientific paper
Ultraviolet observations of two RS CVn binaries obtained with Copernicus are described. High-resolution (0.05 A) U1 observations indicate that both HR 1099 and UX Ari display broad Ly-alpha emission. The Ly-alpha emission strength from HR 1099 is variable and seems to be correlated with orbital phase, while the UX Ari results indicate no significant variation. Moderate resolution (0.51 A) V2 scans of both systems show variable Mg II h and k emission-line profiles which usually matched the velocity of the more active star in each binary. Additionally, displaced emission components were seen at velocities of up to + or - 250 km/s, indicative of high-velocity gas motions. The radial velocities of these emission features from HR 1099 are marginally correlated with orbital phase. Highly active and variable chromospheric phenomena are found to be the most consistent explanation of these results.
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