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Blazhko Effect in the RR Lyrae Variables as a Result of Double Mode Pulsation

Published online by Cambridge University Press:  12 April 2016

K.J. Borkowski
K.J. Borkowski*
Affiliation:
Wrocław University Observatory, Wrocław, Poland

Abstract

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On the basis of a frequency analysis of light variations of AR Her a double-mode pulsation is proposed as an explanation of the Blazhko effect. The analysis revealed a number of components, which can all be interpreted as a result of nonlinear superposition of the fundamental mode, and a mode with period P = 1/(2/P0 + 1/PB) ~ P0/2, where P0 = 0d.470 and Pb = 31d.55 denote the fundamental and the Blazhko effect periods, respectively.

The P ⋍ P0/2 mode can be identified as the second or the third radial overtone. In both these cases the “beat” masses derived from a comparison of the calculated (nonadiabatic) and observed period ratios for RR Lyrae variables with Blazhko effect are different from their evolutionary masses.

Type
VII. RR Lyrae and BL Herculis Variables
Information
International Astronomical Union Colloquium , Volume 58: Stellar Hydrodynamics , August 1980 , pp. 511 - 517
Copyright
Copyright © Reidel 1980

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