Fast stochastic variability study of two SU UMa systems V1504 Cyg and V344 Lyr observed by Kepler satellite

Abstract

We analysed Kepler data of two similar dwarf novae V344 Lyr and V1504 Cyg in order to study optical fast stochastic variability (flickering) by searching for characteristic break frequencies in their power density spectra. Two different stages of activity were analysed separately, i.e. regular outbursts and quiescence. Both systems show similar behaviour during both activity stages. The quiescent power density spectra show a dominant low break frequency which is also present during outburst with a more or less stable value in V344 Lyr while it is slightly higher in V1504 Cyg. The origin of this variability is probably the whole accretion disc. Both outburst power density spectra show additional high frequency components which we interpret as generated by the rebuilt inner disc that was truncated during quiescence. Moreover, V344 Lyr shows the typical linear rms-flux relation which is strongly deformed by a possible negative superhump variability.

arXiv comment10 pages, 9 figures, 2 tables, Accepted for publication in MNRAS

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Cited by in corpus (9)

• XMM-Newton observation of MV Lyr and the sandwiched model confirmation
• Similar shot profile morphology of fast variability in cataclysmic variable, X-ray binary and blazar; the MV Lyr case
• Characterizing the Advective Hot Flows of Nova-Like Cataclysmic Variables in the X-rays: The case of BZ Cam and V592 Cas
• Alternation of the flickering morphology between the high and low state in MV Lyr
• Flickering around the outburst cycle in Kepler dwarf novae
• New structures of Power Density Spectra for four Kepler AGNs
• Searching for the 1 mHz variability in the flickering of V4743 Sgr: a Cataclysmic Variable accreting at a high rate
• XMM-Newton observation of V1504 Cyg as a probe for the existence of an evaporated corona
• Searching for similarities in the accretion flow of Seyfert 1 galaxies and cataclysmic variables based on flare profiles of IRAS 13224-3809, 1H 0707-495, Mrk 766 and MV Lyr