The continuum eclipse of PSR 1957 + 20

Details The continuum eclipse of PSR 1957 + 20 The continuum eclipse of PSR 1957 + 20

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384l..47f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 384, Jan. 10, 1992, p. L47-L51. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

36

Eclipsing Binary Stars, Neutron Stars, Pulsars, Radio Emission, Variable Stars, Flux Density, Line Of Sight, Pulse Duration

Scientific paper

Observations of the eclipsing of the millisecond pulsar PSR 1957 + 20 as a continuum source at wavelengths of 20 and 90 cm are reported. The average 90-cm continuum flux density of the pulsar is found to drop dramatically during pulsed eclipse. In contrast, the neutron star remains visible as a 20-cm continuum source throughout most of the pulsed eclipse, although there is no evidence for a brief loss of signal immediately preceeding conjunction. The 20-cm pulsed eclipse of PSR 1957 + 20 is therefore predominantly caused by the loss of coherent pulsations rather than the diminution of the average radio flux density. It is inferred from these observations that the density of the ionized component of the eclipsing wind does not substantially exceed 10 exp 9 cu cm, except perhaps in a limited region directly preceeding the companion. Radio, optical, and IR observations indicate that the size of the companion to PSR 1957 + 20 may approach that of its Roche lobe, which could explain the apparent ease with which the pulsar ablates its companion as well as the low plasma density of the observed evaporate.

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