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- Title
Theoretical Period–Radius and Period–Luminosity Relations for Mira Variables with Solar Metallicity.
- Authors
Fadeyev, Yu. A.
- Abstract
Evolutionary sequences of AGB stars with initial masses on the main sequence , , and were computed for the initial metallicity . Selected models of evolutionary sequences with envelopes under thermal equilibrium were used as initial conditions for calculation of nonlinear stellar pulsations. The hydrodynamic models of each evolutionary sequence are shown to concentrate along the continuous line in the period–radius and period–luminosity diagrams. The theoretical period–radius and period–luminosity relations differ from one another for different main–sequence star masses because the stellar luminosity of AGB stars depends on the degenerate carbon core mass which increases with increasing . In hydrodynamic models of evolutionary sequences and the periods of the first overtone pulsators are and , whereas all models of the evolutionary sequence oscillate in the fundamental mode. Fairly regular radial oscillations exist in stars with pulsation periods d. In models with longer periods the amplitude rapidly increases with increasing and oscillations become irregular.
- Subjects
STELLAR oscillations; ASYMPTOTIC giant branch stars; MAIN sequence (Astronomy); STELLAR mass; THERMAL equilibrium; PULSATING stars; CEPHEIDS
- Publication
Astronomy Letters, 2023, Vol 49, Issue 11, p722
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/S1063773723110014