The orbital evolution of the eclipsing pulsar PSR 1957 + 20

Details The orbital evolution of the eclipsing pulsar PSR 1957 + 20 The orbital evolution of the eclipsing pulsar PSR 1957 + 20

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235p..33c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Dec. 1, 1988, p. 33P-36P.

Astronomy and Astrophysics

Astronomy

9

Eclipsing Binary Stars, Orbital Mechanics, Pulsars, Stellar Evolution, Stellar Orbits, Companion Stars, Degenerate Matter, Late Stars, Main Sequence Stars, Symbiotic Stars

Scientific paper

The recently discovered eclipsing radio pulsar PSR 1957+20 has a 1.6-ms spin period and a 9.17-hr orbit. The system inclination is close to 90° and the companion has a mass of only 0.022 M_sun;. The eclipse is caused by intense and asymmetric mass loss from this star, presumably driven in some way by energy injected by the pulsar. Here the authors point out that the orbital evolution of the system is determined by the specific angular momentum carried off by this wind. Depending on its sign and magnitude, the progenitor system could in principle be an accreting binary in which the mass-losing star was degenerate, main sequence, or evolved.

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