RXTE Observations of the Anomalous Pulsar 4U 0142+61

Details RXTE Observations of the Anomalous Pulsar 4U 0142+61 RXTE Observations of the Anomalous Pulsar 4U 0142+61

1998-09-02

arxiv.org/abs/astro-ph/9809016v1

ApJ 513 1999 464

Astronomy and Astrophysics

Astrophysics

20 pages (LaTeX) including 7 figures. Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/306839

We observed the anomalous X-ray pulsar 4U 0142+61 using the Proportional Counter Array (PCA) aboard the Rossi X-ray Timing Explorer (RXTE) in March 1996. The pulse frequency was measured as f = 0.11510039(3) Hz with an upper limit of df/dt < 4 * 10^(-13) Hz/s upon the short term change in frequency over the 4.6 day span of the observations. A compilation of all historical measurements showed an overall spin-down trend with slope df/dt = (-3.0 +/- 0.1) * 10^(-14) Hz/s. Searches for orbital modulations in pulse arrival times yielded an upper limit of a_x sin i < 0.26 lt-s (99% confidence) for the period range 70 s to 2.5 days. These limits combined with previous optical limits and evolutionary arguments suggest that 4U 0142+61 is probably not a member of a binary system.

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