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Optical observations of the X-ray source 2S0921-630

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Abstract

We report photometric observations of the optical counterpart of the X-ray source 2S0921-630. The data, obtained at the South African Astronomical Observatory during 3 weeks in 1980 and 1981, are consistent with a 17.9 day periodic modulation of the flux in the B band. Correlated variability of the (B-V) and (U-B) colour indices with the B mag. is demonstrated and quantified. The observed B mag. and colours at maximum and minimum light are used to compute some of the system parameters. A model of 2S0921-630 is proposed in terms of a binary system in which the variable inclination of a luminous accretion disc produces the long-term modulation of the optical flux.

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Authors and Affiliations

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

    G. Branduardi-Raymont, R. Corbet & A. N. Parmar

  2. Royal Greenwich Observatory, Hailsham, Sussex, UK

    P. G. Murdin

  3. Space Sciences Laboratory, Berkeley, Ca., USA

    K. O. Mason

Authors
  1. G. Branduardi-Raymont
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  2. R. Corbet
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  3. A. N. Parmar
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  4. P. G. Murdin
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  5. K. O. Mason
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Branduardi-Raymont, G., Corbet, R., Parmar, A.N. et al. Optical observations of the X-ray source 2S0921-630. Space Sci Rev 30, 279–286 (1981). https://doi.org/10.1007/BF01246032

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  • DOI: https://doi.org/10.1007/BF01246032

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