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An investigation into the nature of the 4.4 hr periodic source 4U1755-33

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Abstract

We present the results of a continuous 18 hour observation of 4U1755-33 made with the European Space Agency's EXOSAT Observatory. Four 50 min dips in X-ray intensity were observed equally spaced with a period of 4.4 hrs, confirming the periodicity first suggested in White et al. (1984). The dips are spectrally independent. We examine the properties of 4U1755-33 and conclude that the source is most probably point-like and that the metallicity of the absorbing material is at least 600 times less than cosmic values.

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Authors and Affiliations

  1. EXOSAT Observatory, ESOC, Robert Bosch Str. 5, 61, Darmstadt, W. Germany

    A. N. Parmar & N. E. Whitel

  2. MPI für Physik und Astrophysik, D-8046, Garching, W. Germany

    M. Sztajno

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

    K. O. Mason

Authors
  1. A. N. Parmar
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  2. N. E. Whitel
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  3. M. Sztajno
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  4. K. O. Mason
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Parmar, A.N., Whitel, N.E., Sztajno, M. et al. An investigation into the nature of the 4.4 hr periodic source 4U1755-33. Space Sci Rev 40, 213–217 (1985). https://doi.org/10.1007/BF00212887

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