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- An IUE program to monitor the ultraviolet variability in RV Tauri stars was initiated. The Mg II region was investigated as a potential probe of atmospheric shocks, which are believed to be associated with the pulsational variability of this class of objects. Observations, a description of the spectra, and findings for V Vul and AC Her are presented. The Mg II emission does vary significantly during the cycle; major changes in the emission line strength occur on a time scale much less than 0.2 in phase; and as the UV (and optical) continuum flux increases, the Mg II lines decrease and increased emission may be seen at 2823, 2844, and 2900 A.
- Other Subject(s):
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19890001381.
Accession ID: 89N10752.
ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 343-346.
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