Investigation of resonances in models of population II cepheids

Journal Article · Tue Jul 01 04:00:00 EDT 1986 · Astrophysics (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF01005574· OSTI ID:6932955

Fokin, A B

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 evidently be sought in the interaction of these two mechanisms.

• Research Organization: Astronomical Council, Acad. of Sci.
• OSTI ID: 6932955
• Journal Information: Astrophysics (Engl. Transl.); (United States), Journal Name: Astrophysics (Engl. Transl.); (United States) Vol. 24:1; ISSN ATPYA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CEPHEIDS
FLUID MECHANICS
HYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
NONLINEAR PROBLEMS
OSCILLATIONS
PULSATING VARIABLE STARS
RESONANCE
SPECTRA
STAR MODELS
STARS
STELLAR RADIATION
TRAVELLING WAVES
VARIABLE STARS
WAVE PROPAGATION