Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

  • Letter
  • Published:

Origin of the optical emission from Sco X-1

Nature volume 253, pages 699–701 (1975)Cite this article

Abstract

Two groups have reported analyses of photometric1,2 and spectroscopic3 data of Sco X-1, which suggest a binary nature. Prior to these studies no persistent periodic variations of the X-ray flux have been found, but the first group1 claims a periodic variation in the light curve of 3.93 d with a mean amplitude of 0.8 mag, and the second2 claims variations of 0.22 mag in amplitude, with a period of 0.787 d.

This is a preview of subscription content, access via your institution

Access options

Buy this article

  • Purchase on Springer Link
  • Instant access to full article PDF
Buy now

Prices may be subject to local taxes which are calculated during checkout

Similar content being viewed by others

References

  1. Martynov, D. Ya, IAU Circ., No. 2675 (1974).

  2. Gottlieb, E. W., Wright, E. L., and Liller, W., IAU Circ., No. 2704 (1974).

  3. Martynov, D. Ya., IAU Circ., No. 2679 (1974).

  4. Neugebauer, G., Oke, J. B., Becklin, E., and Garmire, G., Astrophys., J. 155, 1 (1969).

    Article  ADS  Google Scholar 

  5. Chodil, G., Mark, H., Rodrigues, R., Seward, F. D., Swift, C. D., Turiel, I., Hiltner, W. A., Wallerstein, G., and Mannery, E. J., Astrophys. J., 154, 645 (1968).

    Article  ADS  Google Scholar 

  6. Shklovsky, I. S., Astrophys. J. Lett., 148, L1 (1967).

    Article  ADS  Google Scholar 

  7. Canizares, C. R., Clark, G. W., Li, F. K., Murthy, G. T., Bardas, D., Sprott, G. F., and Spenser, T. H., Astrophys. J., (in the press).

  8. Allen, C. W., Astrophysical Quantities, third ed. (Athlone Press, London, 1973).

    Google Scholar 

  9. Johnson, H. M., Astrophys. J., 144, 635 (1966).

    Article  ADS  Google Scholar 

  10. Wallerstein, G., Astrophys. Lett., 1, 31 (1967).

    ADS  Google Scholar 

  11. Gribbin, J., Astrophys. Lett., 8, 175 (1971).

    ADS  Google Scholar 

  12. Nave, M. F., thesis, Univ. Sao Paulo (1974).

  13. Johnson, H. M., Astrophys. J., 164, 67 (1971).

    Article  ADS  CAS  Google Scholar 

  14. Silk, J., Goldsmith, D. W., Field, G. B., and Canasco, L., Astr. Astrophys., 20, 287 (1972).

    ADS  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Instituto Astronômico e Geofísico, Universidade de São Paulo, CP 30.627, São Paulo, Brazil

    J. A. DE FREITAS PACHECO

Authors
  1. J. A. DE FREITAS PACHECO
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

DE FREITAS PACHECO, J. Origin of the optical emission from Sco X-1. Nature 253, 699–701 (1975). https://doi.org/10.1038/253699a0

Download citation

  • Received:

  • Revised:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1038/253699a0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

Search

Advanced search

Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing