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Copernicus observations of Ly-alpha and Mg II emission from HR 1099 /V711 Tauri/ and UX AriUltraviolet 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.
Document ID
19780060403
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Weiler, E. J.
(Princeton University New Observatory, Princeton, N.J., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1978
Publication Information
Publication: Astronomical Journal
Volume: 83
Subject Category
Astrophysics
Accession Number
78A44312
Funding Number(s)
CONTRACT_GRANT: NAS5-23576
Distribution Limits
Public
Copyright
Other

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