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.

Cygnus X-1—a Spectroscopic Binary with a Heavy Companion ?

Abstract

WE have reported1 that the spectrum, colours and interstellar features in the star HD 226868, which is coincident with the X-ray star Cygnus X-1 and a radio star2,3, were those of a normal BOIb supergiant. We made measurements of the radial velocity of the star from August 1971 to October 1971 and find it to be a velocity variable, whose changes of velocity correlate with changes in the X-ray flux.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Murdin, P., and Webster, B. L., Nature, 233, 110 (1971).

    ADS  CAS  Article  Google Scholar 

  2. 2

    Braes, L. L. E., and Miley, G. K., Nature, 232, 246 (1971).

    ADS  CAS  Article  Google Scholar 

  3. 3

    Rappaport, S., Zaumen, W., and Doxsey, R., Astrophys. J. Lett., 168, L17 (1971).

    ADS  Article  Google Scholar 

  4. 4

    Stothers, R., and Lloyd Evans, T., Observatory, 90, 186 (1970).

    ADS  Google Scholar 

  5. 5

    Slettebak, A., and Howard, R. E., Astrophys. J., 120, 102 (1955).

    ADS  Article  Google Scholar 

  6. 6

    Allen, C. W., Astrophysical Quantities (second ed.) (University of London Press, 1964).

    Book  Google Scholar 

  7. 7

    Dolan, J. F., Space Sci. Rev., 10, 830 (1971).

    ADS  Article  Google Scholar 

  8. 8

    Dolan, J. F., Nature, 233, 109 (1971).

    ADS  CAS  Article  Google Scholar 

  9. 9

    Agrawal, P. C., Gokhale, G. S., Iyengar, V. S., Kunte, P. K., Manchanda, R. K., and Sreekantan, B. V., Nature, 232, 38 (1971).

    ADS  CAS  Article  Google Scholar 

  10. 10

    Plavec, M., Bull. Astron. Inst. Czech., 18, 253 (1967).

    ADS  Google Scholar 

  11. 11

    Oda, M., Gorenstein, P., Gursky, H., Kellogg, E., Schreier, E., Tannanbaum, H., and Giacconi, R., Astrophys. J. Lett., 166, L1 (1971).

    ADS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

WEBSTER, B., MURDIN, P. Cygnus X-1—a Spectroscopic Binary with a Heavy Companion ?. Nature 235, 37–38 (1972). https://doi.org/10.1038/235037a0

Download citation

Further reading

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

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