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- Title
Theoretical Mass Estimates for the Mira-Type Variable R Hydrae.
- Authors
Fadeyev, Yu. A.
- Abstract
Calculations of stellar evolution at initial abundances of helium and heavier elements were done for stars with masses on the main sequence . Evolutionary sequences corresponding to the AGB stage were used for modelling the pulsation period decrease observed for almost two centuries in the Mira-type variable R Hya. Diminution of the period from 495 d in the second half of the eighteenth century to d in the 1950s is due to stellar radius decrease accompanying dissipation of the radiation–diffusion wave generated by the helium flash. For all the history of its observations R Hya was the fundamental mode pulsator. The best agreement with observations is obtained for eight evolutionary models with initial mass and the mass loss rate parameter of the Blöcker formula . Theoretical mass estimates of R Hya are in the range , whereas the mean stellar radius () corresponding to the pulsation period d agrees well with measurements of the angular diameter by methods of the optical interferometric imaging.
- Subjects
MAIN sequence (Astronomy); STELLAR evolution; STELLAR oscillations; HEAVY elements; PULSATING stars; EVOLUTIONARY models; ANGULAR measurements
- Publication
Astronomy Letters, 2023, Vol 49, Issue 4, p167
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/S1063773723040023