The Masses of Two Binary Neutron Star Systems
نویسندگان
چکیده
The measurement or constraint of the masses of neutron stars and their binary companions tests theories of neutron star structure and of pulsar formation and evolution. We have measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802−07: ω̇ = 0. 060 ± 0. 009 yr, which implies a total system mass, pulsar plus companion star, of M = 1.7 ± 0.4M⊙. We also present a much improved measurement of the rate of periastron advance for PSR B2303+46: ω̇ = 0. 0099 ± 0. 0002 yr, implying M = 2.53 ± 0.08M⊙ for this system. We discuss the available constraints on distribution of mass between the pulsars and their companions, and we compare the pulsar masses with other determinations of neutron star masses. Subject headings: pulsars — stars: binaries — stars: neutron — stars: individual (PSR B1802−07 — PSR B2303+46)
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