Roche tomography of cataclysmic variables - VIII. The irradiated and spotted dwarf nova, SS Cygni - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2017

Roche tomography of cataclysmic variables - VIII. The irradiated and spotted dwarf nova, SS Cygni

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Robert Connon Smith
  • Function : Author
L. Hebb
  • Function : Author
P. Szkody
  • Function : Author

Abstract

We present the results of our spectroscopic study of the dwarf nova SS Cyg, using Roche tomography to map the stellar surface and derive the system parameters. Given that this technique takes into account the inhomogeneous brightness distribution on the surface of the secondary star, our derived parameters are (in principle) the most robust yet found for this system. Furthermore, our surface maps reveal that the secondary star is highly spotted, with strongly asymmetric irradiation on the inner hemisphere. Moreover, by constructing Doppler tomograms of several Balmer emission lines, we find strong asymmetric emission from the irradiated secondary star, and an asymmetric accretion disc that exhibits spiral structures.
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insu-03676797 , version 1 (24-05-2022)

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C. A. Hill, Robert Connon Smith, L. Hebb, P. Szkody. Roche tomography of cataclysmic variables - VIII. The irradiated and spotted dwarf nova, SS Cygni. Monthly Notices of the Royal Astronomical Society, 2017, 472, pp.2937-2944. ⟨10.1093/mnras/stx2260⟩. ⟨insu-03676797⟩
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