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- W4308671113 abstract "Evolutionary tracks of stars with masses on the main sequence $0.84M_odotle M_textrm{ZAMS}le 0.95M_odot$ and initial metal abundances $Z=0.006$ and $Z=0.01$ were computed under various assumptions about the mass loss rate at the red giant stage as well as at the AGB and the post--AGB stages. Among 160 evolutionary sequences we selected nearly 30 sequences where the final thermal flash of the helium shell source occurs in the early post--AGB stage when the ratio of the hydrogen envelope mass to the stellar mass ranges from 0.01 to 0.08. Selected evolutionary sequences were used for calculation of initial and inner boundary conditions used in solution of the equations of radiation hydrodynamics and turbulent convection describing evolution of stellar pulsations after the helium flash. Among about three dozen hydrodynamic models we found the three ones demonstrating almost eightfold increase of the pulsation period observed in V725 Sgr during the last century as well as the gradual transformation of fairly regular pulsations with period $Piapprox 12$ day to semi--regular non--linear oscillations with period $80~textrm{day} lesssimPilesssim 90~textrm{day}$. We conclude that the anomalous growth of the pulsation period in V725 Sgr is due to the final thermal flash of the helium shell source that occurred in the early post--AGB star with mass $Mapprox 0.53M_odot$ and the mass of the hydrogen envelope ranging from $0.013M_odot$ to $0.019M_odot$." @default.
- W4308671113 created "2022-11-14" @default.
- W4308671113 creator A5063361526 @default.
- W4308671113 date "2022-11-08" @default.
- W4308671113 modified "2023-10-18" @default.
- W4308671113 title "The nature of anomalous period increase in the pulsating variable V725 Sgr" @default.
- W4308671113 doi "https://doi.org/10.48550/arxiv.2211.04147" @default.
- W4308671113 hasPublicationYear "2022" @default.
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