Computer Science
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..237f&link_type=abstract
Nature (ISSN 0028-0836), vol. 333, May 19, 1988, p. 237-239. NSF-NBS-supported research.
Computer Science
275
Circular Orbits, Companion Stars, Eclipsing Binary Stars, Pulsars, Ionized Gases, Microwave Spectrometers, Orbital Velocity, Plasma Density, Stellar Temperature, Stellar Winds
Scientific paper
A remarkable pulsar with period 1.6 ms, moving in a nearly circular 9.17 hr orbit around a low-mass companion star, has been discovered. At an observing frequency of 430 MHz, the pulsar, PSR1957+20, is eclipsed once each orbit for about 50 minutes. For a few minutes before an eclipse becomes complete, and for more than 20 minutes after the signal reappears, the pulses are delayed by as much as several hundred microseconds - presumably as a result of propagation through plasma surrounding the companion. The pulsar's orbit about the system barycenter has a radius of 0.089 light seconds projected onto the line of sight. The observed orbital period and size, together with the fact that eclipses occur, imply a surprisingly low companion mass, only a few percent of the mass of the sun.
Fruchter Andrew S.
Stinebring Daniel R.
Taylor Joseph H. Jr.
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