Analysis of spiral structure in the accretion disc of the novalike Cataclysmic Variable EC21178--5417

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.

13 pages, 8 figures

References in corpus (2)

• The Gaia mission
• The Geometry and Ionization Structure of the Wind in the Eclipsing Nova-like Variables RW Tri and UX UMa

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• A systematic study of spiral density waves in the accretion discs of Cataclysmic Variables
• A spectroscopic analysis of the eclipsing nova-like EC21178-5417 -- discovery of spiral density structures
• Spiral-wave-driven accretion in quiescent dwarf novæ