Analysis of spiral structure in the accretion disc of the novalike Cataclysmic Variable EC21178--5417
arXiv:1910.12069 · doi:10.1093/mnras/stz2839
Abstract
We present an extensive Doppler tomography study of the eclipsing novalike EC21178--5417, which exhibits the classic accretion disc signature in the form of double-peak emission lines in its spectrum. Doppler tomograms confirm the presence of a strong, two-armed spiral pattern visible in the majority of the spectral lines studied. This makes EC21178--5417 one of the very few novalikes that show spiral structure in their discs. We also report night-to-night changes in the position and relative strength of the spiral arms, revealing fluctuations on the conditions in the accretion disc.
arXiv comment13 pages, 8 figures
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