Table 2
Summary of evolutionary stages that led from the two ZAMS binaries to the present millisecond pulsar – WD binaries, for PSR J1614−2230 and PSR J0751+1807.
| Pulsar | ZAMS | 1st RG | CE | SNIb/c | 2nd RG | IMXB/LMXB | Today | ||
|
|
|||||||||
| PSR J1614−2230 | primary | 25 M⊙ | 5 × 106 yr | 7 M⊙ | 1.9 M⊙ | 1.97 M⊙ | |||
| secondary | 4.5 M⊙ | 4.5 M⊙ | 4.5 M⊙ | 5 × 107 yr | 5 × 107 yr | 0.50 M⊙ | |||
| P orb | 3 yr | 4d | 2d | 8.7d | |||||
|
|
|||||||||
| PSR J0751+1807 | primary | 15 M⊙ | 107 yr | 5 M⊙ | 1.2 M⊙ | 1.26 M⊙ | |||
| secondary | 1.6 M⊙ | 1.6 M⊙ | 1.6 M⊙ | 3 × 109 yr | 109 yr | 0.12 M⊙ | |||
| P orb | 5 yr | 1d | 3d | 6.3h | |||||
Notes. The IMXB/LMXB column gives a rough estimate of the duration of the accretion phase onto NS at this stage. The last column contains presently measured parameters of the binaries.
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