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EXOSAT results on the X-ray burster 2S1254-690

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Abstract

EXOSAT observations of 2S1254-690 in August 1984 have confirmed the presence of periodic dips in the X-ray intensity. These dips occurred with a period of 3.9 hours and last for about 50 minutes. During individual dips the observed X-ray flux oscillated several times between the quiescent level and an undetectable level on time scales varying from a few seconds to approximately 5 minutes. In addition, a second type one burst has been observed, with characteristics which are very similar to those observed earlier. In this paper we report the results of a 20 hour EXOSAT observation made in 1984 August 6th to 7th, and discuss some properties of the dips and of the burst.

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References

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Authors and Affiliations

  1. Space Telescope European Coordinating Facility ESO, Karl-Schwarzschild-Str. 2, D-8046, Garching bei München, West Germany

    Thierry J. -L. Courvoisier

  2. EXOSAT Observatory ESOC, Robert Bosch Strasse 5, D-6100, Darmstadt, West Germany

    Arvind N. Parmar

  3. Astrophysics Division, ESTEC, Postbus 299, NL-2200, AC Noordwijk, The Netherlands

    Tony Peacock

Authors
  1. Thierry J. -L. Courvoisier
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  2. Arvind N. Parmar
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  3. Tony Peacock
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affiliated to the Astrophysics Division, Space Science Department, ESA

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Courvoisier, T.J.L., Parmar, A.N. & Peacock, T. EXOSAT results on the X-ray burster 2S1254-690. Space Sci Rev 40, 275–279 (1985). https://doi.org/10.1007/BF00212898

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