On the origin of the alternating deep and shallow light minima in RV Tauri stars - R Scuti and AC Herculis

Details On the origin of the alternating deep and shallow light minima in RV Tauri stars - R Scuti and AC Herculis On the origin of the alternating deep and shallow light minima in RV Tauri stars - R Scuti and AC Herculis

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..215g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 215-226.

Astronomy and Astrophysics

Astrophysics

7

Line Spectra, Power Spectra, Stellar Models, Stellar Oscillations, Variable Stars, Hydrodynamic Equations, Line Shape, Shock Wave Propagation

Scientific paper

Clean power spectra of the two well-known RV Tauri stars, R Scuti and AC Herculis, are presented. R Sct is one of the most irregular stars of this pulsating variable class, while AC Her is one of the most regular. Except the frequency peaks at nu0/2 and 3nu0/2, where the fundamental period P0 = 1/nu0 is assumed to be the interval between two successive shallow and deep light minima, none of the higher subharmonics or their multiples are detected. Moreover, for R Sct, each frequency peak shows a multicomponent structure which is not encountered within power spectra deduced from hydrodynamical stellar models. This means that the pulsation of R Sct is never strictly periodic. Thus, both the period-doubling bifurcation scenario suggested by Kovacs & Buchler (1988) and the type-I intermittency occurring just after a 4-cycle period-doubling bifurcation (Aikawa, 1990) are clearly not confirmed. The origin of the characteristic alternation of shallow and deep minima is qualitatively consistent with a radiative shock wave effect associated with the development of an extended pulsation running wave. This suggestion merits a realistic but difficult theoretical investigation.

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