Table A.1.
Evolution of a zero-age main-sequence binary towards IK Peg. For the pre-CE evolution, CE evolution, and post-CE evolution, we used the BSE code. We adopted the assumptions described in Sect. 3, a CE efficiency of α = 0.3 and a circular zero-age main-sequence binary orbit. The terms M1 and M2 and Type1 and Type2 are the masses and stellar typesa of the progenitors of the WD and companion, respectively, and R1 is the radius of the WD progenitor. Porb is the orbital period. The last column corresponds to the event occurring in the binary at the time given in the first column.
| Time | M1 | M2 | R1 | Type1 | Type2 | Orbital Period | Event |
|---|---|---|---|---|---|---|---|
| (Myr) | (M⊙) | (M⊙) | (R⊙) | (days) | |||
| 0.0000 | 6.510 | 1.600 | 3.066 | MS | MS | 6108.700 | zero-age MS binary |
| 57.3386 | 6.481 | 1.600 | 7.148 | SG | MS | 6152.441 | change in primary type |
| 57.5368 | 6.481 | 1.600 | 82.463 | FGB | MS | 6153.224 | change in primary type |
| 57.6120 | 6.479 | 1.600 | 187.667 | CHeB | MS | 6155.216 | change in primary type |
| 64.9580 | 6.362 | 1.600 | 154.565 | E-AGB | MS | 6336.515 | change in primary type |
| 65.3065 | 6.313 | 1.600 | 470.502 | TP-AGB | MS | 6398.505 | change in primary type |
| 65.7503 | 3.527 | 1.706 | 1055.410 | TP-AGB | MS | 5883.777 | begin RLOF (primary is the donor) |
| 65.7503 | 3.527 | 1.706 | 1055.410 | TP-AGB | MS | 5883.777 | CE evolution (λ = 1.2066) |
| 65.7503 | 1.200 | 1.706 | 0.006 | WD | MS | 21.717 | end RLOF |
Notes. (a)Abbreviations: MS (main-sequence star), SG (subgiant star), FGB (first giant branch star), CHeB (core helium burning), E-AGB (early asymptotic giant branch star), TP-AGB (thermally pulsing asymptotic giant branch star), WD (white dwarf), RLOF (Roche-lobe overflow), CE (common envelope).
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