Transient X-ray rings around dwarf novae

Details Transient X-ray rings around dwarf novae Transient X-ray rings around dwarf novae

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303...49n&link_type=abstract

Nature (ISSN 0028-0836), vol. 303, May 5, 1983, p. 49, 50. Research supported by the Science and Engineering Research Council.

Physics

5

Dwarf Novae, Halos, Ring Structures, X Ray Sources, Grains, Interstellar Matter, Transient Response, X Ray Scattering

Scientific paper

X rays scattered by dwarf novae in outbursts are discussed, with attention given to the potentially transient soft X ray ring around the dwarf nova SU UMa. A flat-topped pulse shape is assumed for the X ray light curve of a dwarf nova, with the outburst luminosity being a black body at 1,000,000 K. Soft X ray emissions result from scattering of the pulse by interstellar grains, which are located between the two foci of the source and the observer. The measurements indicate the presence of an expanding dust ring, with the rate of expansion being proportional to the grain size, with larger meaning faster. SU UMa displayed a radius of 14 arcmin and 6 arcmin width 10 days after an outburst. This radius, combined with data on the presence of soft X rays with the observed distribution, are taken as plausible confirmation of a ring. Future observations with the Exosat spacecraft are expected to provide confirmation.

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