Further GINGA Observations of PSR B0540-69

Details Further GINGA Observations of PSR B0540-69 Further GINGA Observations of PSR B0540-69

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512..300d&link_type=abstract

The Astrophysical Journal, Volume 512, Issue 1, pp. 300-312.

Astronomy and Astrophysics

Astronomy

28

Stars: Pulsars: Individual: Alphanumeric: B0540-69, Stars: Neutron, X-Rays: Stars

Scientific paper

We report the pulse-timing history of PSR B0540-69, based on all applicable data from the Ginga X-ray observatory. Using these data, together with other, overlapping optical and X-ray observations, we have determined an improved value for the braking index, n=2.080, as well as a new estimate for the celestial position of PSR B0540-69. Our results are based on an analysis of local pulse frequencies, using a methodology designed to efficiently utilize the sparsely sampled observations of PSR B0540-69. This strategy rests on iteratively determining a sequence of successively more precise pulse ephemerides from successively more precise estimates of local pulse frequencies. We also present improved X-ray and optical pulse profiles and evidence for a close alignment between profiles in these two energy regimes. We may have detected a small, Crab-like glitch in the pulse frequency of this pulsar in a reanalysis of previously published optical data.

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