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1 results

  • Two optical emission components with different variability in V404 Cygni

  • Yutaro Tachibana, Taketoshi Yoshii, Nobuyuki Kawai
  • Journal:
    Proceedings of the International Astronomical Union / Volume 12 / Issue S324 / September 2016
    Published online by Cambridge University Press:
    23 June 2017, pp. 43-44
    Print publication:
    September 2016
    • Article
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  • V404 Cygni went into an outburst again on June 15, 2015 after 26 years of quietness. Soon after the notifications, we started intense optical observation campaign of this source. The spectral index between RC and IC-band was stable over the outburst, whereas that between g′ and RC-band varied violently. With the time domain analysis of the multi-color optical light curves, we successfully decomposed optical variations into three components: highly-variable component (HVC), little-variable component (LVC). The loci of the LVC in the color-color diagram is consistent with that of a single temperature blackbody radiation or a multi-color blackbody radiation from a standard accretion disk, while those of the HVC trace that of power-law spectra.