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The discovery of a 25 min regular modulation in the X-ray flux from 2S0142+61

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Abstract

A 13 hr observation of 2S0142+61 on 1984 August 27 by EXOSAT shows the X-ray flux of 2S0142+61 to be modulated with a period of 1456+/-6 s. The 1–10 keV spectrum is two component with a ∼0.7 keV thermal and 0.0 energy index power law, with 30% of the total luminosity in the thermal component. The spectrum is absorbed by ∼1 × 1022 H cm-2. Only the hard component is pulsed with a 3 to 10 keV peak to mean amplitude of 35%. Below 2 keV the modulation is less than a few percent. The total 1–10 keV luminosity is 3.5 × 1032 erg s-1 for a distance of 100 pc. Possible optical counterparts are discussed.

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References

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Authors and Affiliations

  1. EXOSAT Observatory, ESOC, Robert-Bosch-Str. 5, 6100, Darmstadt, W. Germany

    N. E. White, P. Giommi & A. N. Parmar

  2. Goddard Space Flight Center, 20771, Greenbelt, MD, USA

    F. E. Marshall

  3. Milliard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, UK

    K. O. Mason

Authors
  1. N. E. White
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  2. P. Giommi
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  3. A. N. Parmar
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  4. F. E. Marshall
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  5. K. O. Mason
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White, N.E., Giommi, P., Parmar, A.N. et al. The discovery of a 25 min regular modulation in the X-ray flux from 2S0142+61. Space Sci Rev 40, 157–162 (1985). https://doi.org/10.1007/BF00212881

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  • DOI: https://doi.org/10.1007/BF00212881

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