The galactic double-mode Cepheids II. Properties of the generalized phase differences

1996/12/05 by E. Poretti, Poretti, Ennio, Ilaria Pardo +1
Physics and Astronomy · Engineering · Chemistry · #Stellar, planetary, and galactic studies #Geophysics and Sensor Technology #Molecular spectroscopy and chirality

paper · pdf · doi:10.48550/arxiv.astro-ph/9612057

Abstract

By considering the least-squares fits of the double-mode Cepheid light curves discussed in Paper I we defined their properties by their Fourier parameters and generalized phase differences G_i,j. When plotting the latter quantities as a function of the respective order, the second order terms are confined in the region just below 3/2π; the third order terms have π/2 < G_i,j < π, the fourth order ones cluster around 2π (or 0), the fifth order ones seem to have π< G_i,j < 3/2 π. The mean G_i,j values are also regularly spaced. The progression of the G_i,j values as a function of the period was investigated and the signature of a possible resonance near 6.0 d was found.

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