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Doppler Tomography of Accretion Disks and Streams in Close Binaries

Published online by Cambridge University Press:  12 July 2007

Mercedes T. Richards*
Affiliation:
Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA, 16802, USA email: mrichards@astro.psu.edu
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Abstract

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The application of tomography to the study of gas flows in interacting binaries has led to fascinating images of the Cataclysmic Variables and Algol-type binaries. Such detailed images are currently unachievable using direct-imaging techniques. Numerous images of accretion flows have now been derived from optical and ultraviolet spectra and they have been used to identify multiple emission sources including the gas stream, accretion disk, accretion annulus, shock regions, and the chromosphere of the mass loser. It was difficult to distinguish between the separate sources of emission since these sources have overlapping velocities in the Doppler tomogram. However, with the aid of a new spectral synthesis code, we can now systematically extract the individual emission sources to sequentially isolate the images of the disk and gas stream. With these new tools, we have begun to extract the critical properties of the disk and gas stream more accurately than previously possible.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

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