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Coordinated EXOSAT and optical observations of the X-ray burster 4U1735-44

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Abstract

We present the first results of an EXOSAT observation of the low-mass X-ray burster 4U1735-44. The ME data show low-amplitude variations in the persistent flux including two 5% dips separated by ∼4 hours. The structure of the single observed burst is briefly described. Five hours of simultaneous B-band photometry were obtained at SAAO with 12 minute time resolution; a strong anti-correlation is shown to exist between the X-ray and optical flux, with a high level of significance. A model for this behaviour is suggested, based on reprocessing of the X-ray flux in a corona or stellar wind.

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Authors and Affiliations

  1. Department of Astrophysics, University of Oxford, South Parks Road, OX1 3RQ, Oxford, UK

    A. P. Smale, R. H. D. Corbet & P. A. Charles

  2. South African Astronomical Observatory, P.O. Box 9, 7935, South Africa

    J. W. Menzies & P. Mack

Authors
  1. A. P. Smale
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  2. R. H. D. Corbet
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  3. P. A. Charles
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  4. J. W. Menzies
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  5. P. Mack
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Smale, A.P., Corbet, R.H.D., Charles, P.A. et al. Coordinated EXOSAT and optical observations of the X-ray burster 4U1735-44. Space Sci Rev 40, 281–286 (1985). https://doi.org/10.1007/BF00212899

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  • DOI: https://doi.org/10.1007/BF00212899

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