AbstractWe analyze the three outbursts of the X-ray millisecond pulsar SAX J1808.4-3658 that occurred in 1998, 2000, and 2002 observed with RXTE. With a technique based on epoch folding search we find an unique orbital solution valid over the five years of high temporal resolution data available. We revise the estimate of the orbital period, Porb=7249.1569(1)s and of its error, which we decrease by one order of magnitude. We also give the first constraint on the orbital period derivative, - 6.6 × 10 - 12 < P ˙ orb < + 0.8 × 10 - 12 s s - 1 . We find that in 2002 the pulse profile shape is clearly asymmetric, showing a secondary peak at about 145° from the main pulse, which is different from the sinusoidal shape reported at the beginning of the 1998 outburst.


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    Title :

    Improved orbital parameters of accreting millisecond pulsar SAX J1808.4-3658


    Contributors:
    Menna, M.T. (author) / Papitto, A. (author) / Burderi, L. (author) / Di Salvo, T. (author) / D’Antona, F. (author) / Robba, N.R. (author)

    Published in:

    Advances in Space Research ; 38 , 12 ; 2704-2706


    Publication date :

    2005-11-14


    Size :

    3 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Improved orbital parameters of accreting millisecond pulsar SAX J1808.4-3658

    Menna, M. T. / Papitto, A. / Burderi, L. et al. | British Library Conference Proceedings | 2006



    Kilohertz quasi-periodic oscillations in SAX J1808.4-3658

    Wijnands, R. / COSPAR | British Library Conference Proceedings | 2006