K-band spectroscopy of the intermediate polar XY Ari |
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| Authors: | SP Littlefair VS Dhillon TR Marsh |
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| Institution: | 1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH;2Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ |
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| Abstract: | We present the K -band infrared spectrum of the intermediate polar XY Ari. The spectrum confirms the cataclysmic binary nature of XY Ari, showing emission lines of He i ( λ 2.0587 μm) and the Brackett and Paschen series of H i . The broad nature of these lines suggests an origin in an accretion disc. The spectrum is strongly reddened by absorption within the molecular cloud Lynds 1457 and shows prominent absorption features from the secondary star, from which we determine a spectral type for the secondary of M0V. The secondary contributes  per cent of the K -band light. We derive a visual extinction to XY Ari of  and a distance of  , placing XY Ari behind the molecular cloud. |
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| Keywords: | accretion accretion discs binaries: close stars: individual: XY Ari (H0253+193) novae cataclysmic variables infrared: stars X-rays: individual: XY Ari (H0253+193) |
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