MESA Models of the Evolutionary State of the Interacting Binary epsilon Aurigae
arXiv:1803.06392 · doi:10.1093/mnras/sty639
Abstract
Using MESA code (Modules for Experiments in Stellar Astrophysics, version 9575), an evaluation was made of the evolutionary state of the epsilon Aurigae binary system (HD 31964, F0Iap + disk). We sought to satisfy several observational constraints: 1) requiring evolutionary tracks to pass close to the current temperature and luminosity of the primary star; 2) obtaining a period near the observed value of 27.1 years; 3) matching a mass function of 3.0; 4) concurrent Roche lobe overflow and mass transfer; 5) an isotopic ratio 12 C/ 13 C = 5 and, (6) matching the interferometrically determined angular diameter. A MESA model starting with binary masses of 9.85 + 4.5 Msun , with a 100 day initial period, produces a 1.2 + 10.6 Msun result having a 547 day period, and a single digit 12 C/ 13 C ratio. These values were reached near an age of 20 Myr, when the donor star comes close to the observed luminosity and temperature for epsilon Aurigae A, as a post-RGB/pre-AGB star. Contemporaneously, the accretor then appears as an upper main sequence, early B-type star. This benchmark model can provide a basis for further exploration of this interacting binary, and other long period binary stars.
6 pages, 2 figures, accepted by MNRAS
References in corpus (5)
- The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
- Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer
- On Carbon Burning in Super Asymptotic Giant Branch Stars
- Orbital Evolution of Algol Binaries with a Circumbinary Disk
- 12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791
Cited by in corpus (5)
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- Accretion induced merger leading to core collapse supernovae in old stellar populations
- Rare events of a peculiar thermonuclear supernova that precedes a core collapse supernova