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Title: The soft X-ray properties of the polar EK UMa
Authors: Clayton, K. L.
Osborne, Julian Paul
First Published: 1-May-1994
Publisher: Blackwell Science Ltd
Citation: Monthly Notices Of The Royal Astronomical Society, 1994, 268 (1), pp. 229-234 (6)
Abstract: We present the first extensive soft X-ray observation of the polar EK UMa (1E1048.5+5241)(1E1048.5+5241). The complete orbital light curve obtained from this ROSAT observation shows a single bright phase of width Δϕ=0.63.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 8×10[Superscript: 18]<ΔNH<3×10[Superscript: 20]atomcm[Superscript: −2]. The soft X-ray spectrum has an unusually high temperature of 50<kTBB<62eV50<kTBB<62eV. 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.
DOI Link: 10.1093/mnras/268.1.229
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 1994 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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