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A soft X-ray halo around SU UMa

Nature volume 287, pages 25–27 (1980)Cite this article

Abstract

The dwarf nova SU UMa was observed with the imaging proportional counter (IPC) detector1 on the Einstein X-Ray Observatory on 4 October 1979 at 4 h UT for ∼3,000 s. An X-ray source was detected at the position of the star. It had a flux of 1.3 × 10−11 erg cm−2 s−1 (0.6 counts per s) in the 0.1–4.5 keV energy range of the IPC, assuming a spectral temperature of ∼10 keV (ref. 2). In addition, several areas of weaker emission were observed which form a ring that is symmetrically disposed about the position of the dwarf nova. This latter emission is detected only at energies below 0.7 keV. We discuss here the possibility that it arises in material that has been ejected from the star in a nova-like event.

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Authors and Affiliations

  1. Los Alamos Scientific Laboratory, The University of California, Los Alamos, New Mexico, 87545

    F. A. Cordova

  2. Space Science Laboratory and the Astronomy Department, The University of California, Berkeley, California, 94720

    K. O. Mason

Authors
  1. F. A. Cordova
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  2. K. O. Mason
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Cordova, F., Mason, K. A soft X-ray halo around SU UMa. Nature 287, 25–27 (1980). https://doi.org/10.1038/287025a0

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