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Table 2

Summary of evolutionary stages that led from the two ZAMS binaries to the present millisecond pulsar – WD binaries, for PSR J16142230 and PSR J0751+1807.

Pulsar ZAMS 1st RG CE SNIb/c 2nd RG IMXB/LMXB Today

PSR J16142230 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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