Rotational parameters of PSR 0540 - 69 as measured at optical wavelengths

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Abstract

The rotation frequency of the 50 ms pulsar PSR 0540 - 69 utilizing data collected at the ESO 3.6 m telescope at La Silla is measured. The observations were acquired in the interval 1989 January-1991 April. The average pulse shape displays a broad enhancement with a superposed double-peaked structure. It was possible to phase-relate the data between 1990 March and 1991 April indicating the pulsar did not display any large spin discontinuities during that time span. Three solutions, incorporating a pulse number ambiguity of +/- 1, are presented. The preferred solution yields a braking index of 2.04 +/- 0.02, comparable with GINGA measurements in 1987. Discrepancies between these results and extrapolation of the GINGA results are discussed.

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