GINGA observations of the 50 millisecond pulsar PSR 0540 - 69

Details GINGA observations of the 50 millisecond pulsar PSR 0540 - 69 GINGA observations of the 50 millisecond pulsar PSR 0540 - 69

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351l..13n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 351, March 1, 1990, p. L13-L16.

Astronomy and Astrophysics

Astronomy

41

Ginga Satellite, Japanese Space Program, Magellanic Clouds, Pulsars, Spaceborne Astronomy, Supernova Remnants, Astronomical Models, Crab Nebula, Neutron Stars, X Ray Sources

Scientific paper

Extensive Ginga observations of PSR 0540 - 69, the Crab-like 50-msec pulsar in the LMC, have been obtained as a side benefit of a pulsar search project for SN 1987A. Through a coherent pulse-timing analysis of data from 46 separate days between July 1987 and October 1988, precise values have been obtained for the pulse frequency and its first and second derivatives. From these values, a braking index of n = 2.02 + or = 0.01 is obtained for PSR 0540 - 69. This is the first accurate measurement of a pulsar braking index from X-ray observations and the third overall. The braking index is much smaller than those previously determined for the Crab pulsar (n = 2.51) and PSR 1509 - 58 (n = 2.83).

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