Discovery of Five Binary Radio Pulsars

Details Discovery of Five Binary Radio Pulsars Discovery of Five Binary Radio Pulsars

2000-12-07

arxiv.org/abs/astro-ph/0012154v1

Astrophys.J. 548 (2001) L187

Astronomy and Astrophysics

Astrophysics

5 pages, 4 embedded EPS figs, accepted for publication by ApJ Letters

Scientific paper

10.1086/319120

We report on five binary pulsars discovered in the Parkes multibeam Galactic plane survey. All of the pulsars are old, with characteristic ages 1-11 Gyr, and have relatively small inferred magnetic fields, 5-90e8 G. The orbital periods range from 1.3 to 15 days. As a group these objects differ from the usual low-mass binary pulsars (LMBPs): their spin periods of 9-88 ms are relatively long; their companion masses, 0.2-1.1 Msun, are, in at least some cases, suggestive of CO or more massive white dwarfs; and some of the orbital eccentricities, 1e-5 < e < 0.002, are unexpectedly large. We argue that these observed characteristics reflect binary evolution that is significantly different from that of LMBPs. We also note that intermediate-mass binary pulsars apparently have a smaller scale-height than LMBPs.

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