The birthrates of galactic low mass binary radio pulsars and their progenitor systems

Details The birthrates of galactic low mass binary radio pulsars and their progenitor systems The birthrates of galactic low mass binary radio pulsars and their progenitor systems

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218..131c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 131-136. Research supported by the Nederlandse Org

Astronomy and Astrophysics

Astrophysics

28

Neutron Stars, Pulsars, Radio Emission, Stellar Evolution, X Ray Binaries, Evaporation, Giant Stars, Stellar Envelopes, Stellar Mass Accretion

Scientific paper

The birthrates of galactic low-mass binary radio pulsars and their possible progenitor systems are reconsidered. Kulkarni and Narayan (1988) found a discrepancy between the birthrates of galactic low-mass binary radio pulsars and low-mass X-ray binaries of short orbital period of at least a factor 100 at the 99 percent confidence level. It is found that the birthrates differ for short orbital period systems by at most a factor 18, whereas the birthrates of the group as a whole are in good agreement. The largest source of uncertainties are the poor statistics of the sample of binary pulsars with a low-mass compansion, the estimated lifetimes of the low-mass X-ray binaries and the unknown number of progenitors of low-mass binary radio pulsars, which accrete at a super-Eddington rate. It is suggested that (partial) evaporation of the secondary in a close binary may resolve (part of) the discrepancy, found for the short orbital period systems.

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