Glitches in the X-Ray Pulsar 1e 2259+586
Vladimir V. Usov
Abstract
Starquakes are considered for fast-rotating magnetic white dwarfs. The X-ray pulsar 1E 2259 + 586 may be such a white dwarf. It is shown that in this case starquakes may be responsible for the decrease of the mean spin-down rate which was observed for 1E 2259 + 586 between 1987 and 1990. The required mass of the white dwarf which is identified with 1E 2259 + 586 is 1.4 - 1.5 M, making this X-ray pulsar the most massive white dwarf known.
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