The eclipsing millisecond pulsar PSR 1957 + 20

Details The eclipsing millisecond pulsar PSR 1957 + 20 The eclipsing millisecond pulsar PSR 1957 + 20

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..642f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 642-650. Research supported by NSF, NBS, U.S. Depar

Other

95

Eclipsing Binary Stars, Pulsars, Radio Spectra, Stellar Winds, Circular Polarization, Companion Stars, Stellar Magnetic Fields, Stellar Orbits

Scientific paper

Information obtained over the past year on the eclipsing millisecond pulsar PSR 1957 + 20 and its orbiting companion is discussed. The pulsar is found to be similar in many ways to other millisecond pulsars: its spin parameters are extremely stable, its period derivative is very small, its profile has a strong interpulse, and its radio spectrum has a steep power-law index. The orbit is nearly circular, and the mass function implies a companion mass not much greater than 0.022 solar. Eclipses last for approximately 56 and 50 min at 318 and 430 MHz, respectively, corresponding to a nu exp - 0.41 + or - 0.09 dependence of eclipse duration on frequency. The available evidence points strongly toward a system in which the radiation from the pulsar heats the companion to the point of ablation, thereby driving a stellar wind that trails outward and behind the companion.

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