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Intermediate-Mass Binary Pulsars: a New Class of Objects?

Published online by Cambridge University Press:  12 April 2016

F. Camilo
F. Camilo*
Affiliation:
The University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, UK. e-mail:[email protected].

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Approximately 4/5 of the ∼ 35 millisecond pulsars known in the disk of the Galaxy are in binary systems. The vast majority of these binary pulsars have (presumed) helium white dwarf companions with masses m2 < 0.45 M⊙, spin periods P < 10 ms, and all are in extremely circular orbits (Fig. 1). In a search for millisecond pulsars with the Arecibo radio telescope, we have recently discovered PSR J1022+1001, a 16.45 ms pulsar in a 7.8 d orbit with a companion that is at least 0.73 M⊙, and is more likely as massive as 0.8−1.0M⊙; and PSR J0621+1002, a 28.85 ms pulsar in an 8.3 d orbit with a companion at least 0.45 M⊙, and more likely with m2 ≈ 0.54 M⊙. One other system, PSR J2145–0750, has P = 16.05 ms, orbital period Pb = 6.8 d, and m2 ≈ 0.50 M⊙ (see Table 1).

Type
Part 7 Binary Systems
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 539 - 540
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

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