Frequency analysis of double-mode cepheids
Open Access
- 1 December 1979
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 189 (4) , 627-640
- https://doi.org/10.1093/mnras/189.4.627
Abstract
The radial velocity data and photometry of eight double-mode cepheids are frequency analysed by Fourier techniques. Once the principal components are identified a simultaneous second-order solution is obtained for the amplitudes and phases of the frequency components. The relative phasing of the magnitude, colour and radial velocity observations is studied. The energy of the pulsation shows strong cross coupling terms. All eight double-mode cepheids have similar properties within the errors and a mean radius of R/R⊙ = 33 ± 2 is derived. There is no evidence that this group of stars is any different from single-mode cepheids of similar period.Keywords
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