Abstract
Since the advent of Doppler tomography, Hα tomograms of eleven eclipsing Algol-type binaries and an ultraviolet tomogram of U Sge have been made from difference profiles. Tomograms of CX Dra, a non-eclipsing Algol, were made from the observed and difference Hα, Hβ, He I λ 6678, and Si II λ 6371 profiles. Tomograms produced at multiple epochs demonstrate stability in systems like β Per and TX UMa but variability in others like U Sge, U CrB, and CX Dra. These tomograms show that the Algols contain a diverse range of circumstellar structures that include a gas stream, accretion annulus, transient accretion disk, and/or chromospheric emission source in a short-period Algol, or a classical accretion disk in a long-period system. Some systems, like U CrB and U Sge, alternate between stream-like and disk-like states. These results were obtained by extracting information that was formerly irretrievable from the observed spectra of these systems.
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Richards, M. (2001). Doppler Tomography of Eclipsing and Non-eclipsing Algols. In: Boffin, H.M., Cuypers, J., Steeghs, D. (eds) Astrotomography. Lecture Notes in Physics, vol 573. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45339-3_21
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