The universal nature of accretion-induced variability: The rms-flux relation in an accreting white dwarf

S. Scaringi, E. Körding, P. Uttley, C. Knigge, P. J. Groot, M. Still

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We report the discovery of a linear relationship between the root mean square (rms) variability amplitude and the mean flux in the accreting white dwarf binary system MV Lyrae. Our light curve, obtained with the Kepler satellite, spans 633d with quasi-continuous 58.8-s cadence resolution. We show, for the first time, that how this cataclysmic variable displays linear rms-flux relations similar to those observed in many other black hole binaries, neutron star binaries and active galactic nuclei. The phenomenological similarity between the rms-flux relation observed here and in other X-ray binaries suggests a common physical origin for the broad-band variability, independent of source type, mass or size of the compact accretor. Furthermore, we infer the viscosity parameter, α, and disc scale height, H/R, using two independent methods. In both cases, both values are found to be uncomfortably high to be accommodated by the disc instability model.

Original languageEnglish
Pages (from-to)2854-2860
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume421
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • Accretion, accretion discs
  • Binaries: Close
  • Black hole physics
  • Novae, cataclysmic variables
  • Stars: Individual: MV Lyrae
  • Stars: Oscillations

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