Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....24..109f&link_type=abstract
(Astrofizika, vol. 24, Jan.-Feb. 1986, p. 109-122) Astrophysics (ISSN 0571-7132), vol. 24, no. 1, July 1986, p. 66-74. Translati
Astronomy and Astrophysics
Astrophysics
1
Cepheid Variables, Fourier Analysis, Resonant Frequencies, Spectrum Analysis, Stellar Models, Stellar Oscillations, Compression Waves, Spectral Energy Distribution, Stellar Envelopes, Vibration Mode
Scientific paper
The Fourier spectra of nonlinear oscillations of models of population II Cepheids are investigated. It is found that frequency resonance between the fundamental mode and an overtone leads to an increase of the mechanical energy of this overtone by 2-3 times. It is also shown that in each cycle of pulsations, a traveling wave, propagating into the interior, is generated in the outer layers of the envelope. The appearance of secondary bumps in the velocity and light curves coincides with the onset of resonance between the fundamental mode and the second overtone. Moreover, the time of formation of the bump coincides with the arrival on the surface of a compression wave reflected from the core. The reason for the formation of the secondary bumps must be sought in the interaction of these two mechanisms.
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