The pulsation of the photosphere of the RV Tauri stars - AC Herculis and R Scuti

Details The pulsation of the photosphere of the RV Tauri stars - AC Herculis and R Scuti The pulsation of the photosphere of the RV Tauri stars - AC Herculis and R Scuti

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..159g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 159-168.

Astronomy and Astrophysics

Astrophysics

29

Photosphere, Shock Waves, Stellar Models, Stellar Oscillations, Variable Stars, Astronomical Spectroscopy, Line Spectra, Radial Velocity, Stellar Atmospheres, Temporal Distribution

Scientific paper

Spectrovelocimetric profiles of the bright RV Tauri star AC Her obtained with CORAVEL are analyzed. These data are used together with observations of R Sct presented previously to confirm the previously presented, qualitative model of the pulsation of the photosphere of RV Tauri. There are always two shock waves produced during each period, which is defined by the duration between two consecutive deep light minima. The derivative of the radial velocity curve shows that each shock is clearly associated with a photospheric acceleration. The strongest shock occurs during the deep light minimum while the weakest one during the shallow light minimum.

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