Observations of ultraviolet variability in RV Tauri stars

Details Observations of ultraviolet variability in RV Tauri stars Observations of ultraviolet variability in RV Tauri stars

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.343b&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 343-346 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

1

Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Variable Stars, Emission Spectra, Shock Waves, Stellar Atmospheres

Scientific paper

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.

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