Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287...25c&link_type=abstract
Nature, vol. 287, Sept. 4, 1980, p. 25-27. Research supported by the U.S. Department of Energy and Miller Institute for Basic Re
Astronomy and Astrophysics
Astronomy
6
Dwarf Stars, Novae, X Ray Astronomy, X Ray Sources, Emission Spectra, Flux Density, Proportional Counters, Stellar Mass Ejection, Stellar Temperature
Scientific paper
The dwarf nova SU UMa was observed with the imaging proportional counter (IPC) detector on the Einstein X-ray Observatory on 4 October 1979 at 4 h UT for about 3,000 s. An X-ray source was detected at the position of the star. It had a flux of 1.3 x 10 to -11th erg/sq cm s (0.6 counts per s) in the 0.1-4.5 keV energy range of the IPC, assuming a spectral temperature of about 10 keV. 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; the possibility that it arises in material that has been ejected from the star in a nova-like event is discussed.
Cordova France A.
Mason Keith O.
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