Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254p..11e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 11P-13P. Research supported by US
Astronomy and Astrophysics
Astronomy
9
Atmospheric Heating, Companion Stars, Stellar Magnetospheres, Stellar Orbits, Angular Momentum, Eclipsing Binary Stars, Evaporation, Pulsars, Stellar Winds
Scientific paper
An orbital period derivative for the PSR 1957+20 system has recently been reported by Ryba & Taylor which indicates orbital contraction over a time-scale of 1015 s. The angular momentum loss of the light companion is probably indicative of heavy mass loss, too high to be explained by previous evaporation scenarios. In addition, Fruchter & Goss have reported an eclipse in the time-integrated component of the pulsar emission at 1400 MHz at a phase of 0.23 to 0.24, slightly before the middle of the eclipse at lower frequencies, implying that the wind is shot out asymmetrically from the companion star's surface. In this letter we suggest that the companion has a magnetosphere which allows for extremely efficient and possibly uneven heating of the companion's surface, and partial collimation of the outflow.
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