Causes of anomalous line-splitting in RV Tauri stars

Details Causes of anomalous line-splitting in RV Tauri stars Causes of anomalous line-splitting in RV Tauri stars

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96...72b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Jan. 1984, p. 72-77.

Astronomy and Astrophysics

Astronomy

14

Line Spectra, Stellar Atmospheres, Stellar Oscillations, Stellar Spectra, Variable Stars, Cepheid Variables, Shock Waves

Scientific paper

Data on the anomalous absorption-line splitting and emission in the RV Tauri stars AC Her, U Mon, and R Sct are examined. It is shown that the Karp line-splitting mechanism for cepheids cannot explain the highly redshifted lines that appear without antecedents in some RV Tauri stars and that the veiling that occurs during rising light appears to affect the bluer absorption components more than the high redshift ones. Evidence is reviewed showing strong shock waves must be present in RV Tauri star atmospheres, and a two-shock picture to explain the anomalous line splitting is presented based on a model for long-period variables by Hill and Willson. Advantages and difficulties of the model are discussed.

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