Abstract
THE first example of a new type of transient X-ray source recently appeared in the direction of the Galactic Centre1. During the peak of its outburst, the new source, GRO J1744 – 28, was very bright in X-rays2 and produced both 2.1-Hz periodic pulsations3 and intense bursts lasting tens of seconds1,4. Before the discovery of this source, it was thought that X-ray stars could not display these different types of activity simultaneously. Here we discuss the nature of the source, which seems to be a strongly magnetic neutron star accreting matter from a low-mass companion star in a low-inclination orbit. The dipole component of its magnetic field is ≲ 1011 G. When the source was at its brightest, its X-ray luminosity between bursts was close to the Eddington critical luminosity5, at which the outward force of the escaping radiation balances the inward force of gravity. The X-ray bursts probably occur when matter that has accumulated in the inner part of the accretion disk briefly overcomes the forces that oppose its inflow, and the gas falls onto the neutron star.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Kouveliotou, C. et al. Nature 379, 799–801 (1996).
Paciesas, W. S., Harmon, B. A., Fishman, G. J., Zhang, S. N. & Robinson, C. R. IAU Circ. No. 6284 (1995).
Finger, M. H. et al. IAU Circ. No. 6285 (1996).
Kouveliotou, C. et al. IAU Circ. No. 6286 (1996).
Lamb, F. K. & Miller, M. C. Astrophys. J. 439, 828–845 (1995).
Ghosh, P. & Lamb, F. K. Astrophys. J. 234, 296–316 (1979).
Finger, M. H., Wilson, R. B. & van Paradijs, J. IAU Circ. No. 6286 (1996).
Swank, J. IAU Circ. No. 6291 (1996).
Dotani, T. et al. IAU Circ. No. 6337 (1996).
Kouveliotou, C. et al. IAU Circ. No. 6369 (1996).
Mészáros, P. High Energy Radiation from Magnetized Neutron Stars (Univ. Chicago Press, 1992).
Angelini, L., White, N. E. & Stella, L. Astrophys. J. 371, 332–341 (1991).
Kalogera, V. & Webbink, R. F. Astrophys. J. 458, 301–311 (1996).
Webbink, R. F., Rappaport, S. & Savonije, G. J. Astrophys. J. 270, 678–693 (1983).
Lewin, W. H. G., Rutledge, R. E., Kommers, J. M., van Paradijs, J. & Kouveliotou, C. Astrophys. J. 462, L39–L42 (1996).
Giles, B. & Strohmayer, T. IAU Circ. No. 6338 (1996).
Jung, G. V. et al. IAU Circ. No. 6321 (1996).
Stark, M. J., Baykal, A., Strohmayer, T. & Swank, J. H. IAU Circ. No. 6334 (1996).
Lamb, F. K., Shibazaki, N., Alpar, M. A. & Shaham, J. Nature 317, 681–687 (1985).
Shibazaki, N. & Lamb, F. K. Astrophys. J. 318, 767–785 (1987).
Zhang, W. et al. IAU Circ. No. 6300 (1996).
Finger, M. H. et al. Nature 381, 291–293 (1996).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Daumerie, P., Kalogera, V., Lamb, F. et al. A strongly magnetic neutron star in a nearly face-on binary system. Nature 382, 141–144 (1996). https://doi.org/10.1038/382141a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/382141a0
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.