Other
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..236m&link_type=abstract
Nature (ISSN 0028-0836), vol. 337, Jan. 19, 1989, p. 236-238. Research supported by NSF.
Other
15
Eclipses, Eclipsing Binary Stars, Pulsars, Stellar Occultation, Clouds, Comet Tails, Companion Stars, Cosmic Dust, Stellar Magnetospheres, Stellar Winds
Scientific paper
The extraordinary eclipsing binary pulsar PSR1957+20 is in eclipse over eight percent of its orbit. Here, two explanations for this behavior are suggested which do not involve a plasma wind driven from the companion and forming a cometlike tail. One possibility is that the companion has a typical white-dwarf magnetic field, and that the eclipse is then due to the plasma-filled magnetosphere which is confined and blown back sharply by the pulsar wind, with the time delays produced by a much less dense tail. In the other limit of negligible magnetization of the companion, an eclipse could be caused by a particulate cloud which should form about the companion. Assuming that the companion is the remnant of an evolved companion star that is now being excited by the 622-Hz pulsar radiation, such excitation could either supply plasma to the magnetosphere or pull off neutral gas and deposit it in the vicinity to sustain a particulate cloud.
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