The Soft X-Ray Properties of the Polar Ek-Ursae

Details The Soft X-Ray Properties of the Polar Ek-Ursae The Soft X-Ray Properties of the Polar Ek-Ursae

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..229c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 1/MAY1, P. 229, 1994

Astronomy and Astrophysics

Astronomy

11

Binaries: Close - Stars: Individual: Ek Uma - Stars: Magnetic Fields - Novae, Cataclysmic Variables - Stars: Rotation - X-Rays: Stars

Scientific paper

We present the first extensive soft X-ray observation of the polar EK UMa (1E 1048.5+5241). The complete orbital light curve obtained from this ROSAT observation shows a single bright phase of width Δφ=0.63. EK UMa is not detected outside this phase interval. During the bright phase a number of deep dips in the flux are seen. These dips can be caused by an additional absorption of 8 × 1018 < ΔNH < 3 × 1020 atom cm-2. The soft X-ray spectrum has an unusually high temperature of 50 < kTBB < 62 eV. No hard X-ray flux is detected, and EK UMa is shown to have a large soft X-ray excess, with a soft-to-hard X-ray luminosity ratio of 7.7-12.2.

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