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First detection of an X-ray burst and a one hour intensity dip in 4U1323-62

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Abstract

We report the results of a 1.4 104s observation of the region of 4U 1323-62 with the EXOSAT ME. The source has a flux of 7–8 10-11 erg/cm2s (2–10 keV) and a power-law spectrum with 1.1 < α < 1.8. During our observation, the source showed a symmetric 60% dip in its X-ray flux of R~1 hr. The spectrum hardens during the dip. Inside the dip we observed an X-ray burst with a 2–10 keV peak flux of ∼7 10-10 erg/cm2s. The burst spectrum is black-body, and shows evidence of cooling during the burst decay. The discovery of a burst from 4U 1323-62 settles the classification of the source; the observation of a dip suggests that we may be able to measure its orbital period in the near future.

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References

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Authors and Affiliations

  1. Space Science Department of ESA, ESTEC, Postbus 299, 2200AG, Noordwijk, Netherlands

    M. van der Klis

  2. Laboratory for Space Research, Postbus 9504, 2300RA, Leiden, Netherlands

    F. Jansen

  3. Astronomical Institute, University of Amsterdam, 1018WB, Amsterdam, Netherlands

    J. van Paradijs & G. Stollmann

Authors
  1. M. van der Klis
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  2. F. Jansen
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  3. J. van Paradijs
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  4. G. Stollmann
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van der Klis, M., Jansen, F., van Paradijs, J. et al. First detection of an X-ray burst and a one hour intensity dip in 4U1323-62. Space Sci Rev 40, 287–291 (1985). https://doi.org/10.1007/BF00212900

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  • DOI: https://doi.org/10.1007/BF00212900

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