Rossi X‐Ray Timing ExplorerObservations of the Anomalous Pulsar 4U 0142+61 | Zendy

C. A. Wilson | Zendy; Stefan Dieters | Zendy; Mark H. Finger | Zendy; Donia Scott | Zendy; J. van Paradijs | Zendy

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Rossi X‐Ray Timing ExplorerObservations of the Anomalous Pulsar 4U 0142+61

Author(s) -

C. A. Wilson,

Stefan Dieters,

Mark H. Finger,

Donia Scott,

J. van Paradijs

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306839

Subject(s) - pulsar , physics , astrophysics , limit (mathematics) , proportional counter , pulse (music) , binary number , range (aeronautics) , binary pulsar , orbital period , astronomy , optics , detector , mathematical analysis , stars , mathematics , arithmetic , millisecond pulsar , materials science , composite material

We observed the anomalous X-ray pulsar 4U 0142+61 using the ProportionalCounter Array (PCA) aboard the Rossi X-ray Timing Explorer (RXTE) in March1996. The pulse frequency was measured as f = 0.11510039(3) Hz with an upperlimit of df/dt < 4 * 10^(-13) Hz/s upon the short term change in frequency overthe 4.6 day span of the observations. A compilation of all historicalmeasurements 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 timesyielded an upper limit of a_x sin i < 0.26 lt-s (99% confidence) for the periodrange 70 s to 2.5 days. These limits combined with previous optical limits andevolutionary arguments suggest that 4U 0142+61 is probably not a member of abinary system.Comment: 20 pages (LaTeX) including 7 figures. Accepted for publication in the Astrophysical Journa

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