RXTE observations of the anomalous pulsar 4U0142+61

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Pulsars, X-Ray Sources, X-Ray Bursts

Scientific paper

We have observed the X-ray pulsar X0142+61 using RXTE in March 1996. This pulsar is one of a small group that are either isolated pulsars or members of very compact, low mass binaries. The pulse period is measured as 8.68814(+/-9) sec with an upper limit of Ṗ/P<=8×10-10 s/s upon the short term spin up/down rate. A compilation of all historical measurements show an overall spin down trend with an episode of more rapid spin up and down between 1984 and 1996. A search for orbital modulations in the pulse arrival times yielded an upper limit <=0.28 lt.sec. in ax sin i over the interval 600 to 105 sec.

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