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1989•Monthly Notices of the Royal Astronomical SocietyOpen access

Absorption dips and the properties of the accretion stream in polars⋆

M. G. Watson, Andrew R. King, Mark H. Jones, Christian Motch

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Abstract

We present simultaneous X-ray, optical and infrared observations of the absorption dips in the polar system EF Eri. We use these observations to determine the properties of the dips, and develop a simple model for the dips in which they are caused by absorption in the accretion stream as it crosses the line-of-sight to the X-ray/optical emission region located in the vicinity of the magnetic pole of the white dwarf. Application of this model to the dips observed in EF Eri yields direct estimates of the density and structure of the accretion stream.

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We present simultaneous X-ray, optical and infrared observations of the absorption dips in the polar system EF Eri. We use these observations to determine the properties of the dips, and develop a simple model for the dips in which they are caused by absorption in the accretion stream as it crosses the line-of-sight to the X-ray/optical emission region located in the vicinity of the magnetic pole of the white dwarf. Application of this model to the dips observed in EF Eri yields direct estimates of the density and structure of the accretion stream.

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Available abstract

We present simultaneous X-ray, optical and infrared observations of the absorption dips in the polar system EF Eri. We use these observations to determine the properties of the dips, and develop a simple model for the dips in which they are caused by absorption in the accretion stream as it crosses the line-of-sight to the X-ray/optical emission region located in the vicinity of the magnetic pole of the white dwarf. Application of this model to the dips observed in EF Eri yields direct estimates of the density and structure of the accretion stream.

Key concepts: Physics, Accretion (finance), White dwarf, Astrophysics, Intermediate polar, Absorption (acoustics), Polar, Line-of-sight

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