Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..143s&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 143-147.
Astronomy and Astrophysics
Astrophysics
57
Binary Stars, Neutron Stars, Pulsars, Stellar Evolution, X Ray Sources, Angular Momentum, Roche Limit, Stellar Magnetic Fields, Stellar Mass Accretion
Scientific paper
It is argued that the combination of 0.059 s pulse period and weak surface dipole magnetic field strength of PSR 1913 + 16 is excluded for a newly born pulsar. This yields support to the suggestion that PSR 1913 + 16 obtained its short pulse period during a spiral-in history, in which it underwent heavy accretion of matter with angular momentum from its companion. The shortest possible pulse period compatible with its magnetic field in such a case is approximately 0.04 s. As this spiral-in will have completely circularized the orbit, its presently large orbital eccentricity indicates that a second supernova explosion must have taken place in the system and, consequently, that its companion is also a neutron star (or a black hole). It is argued that the progenitor system was a binary with component masses of at least 8 solar masses. The various possible types of radio pulsars resulting from the evolution of close binaries are discussed.
Srinivasan Ganesan
van den Heuvel Edward Peter Jacobus
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