Rapid Oscillations in Cataclysmic Variables

Warner, Brian D.

doi:10.1086/381742

Cited by 105 publications

(124 citation statements)

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“…The phenomenology of DNOs is too vast to summarise here (see Warner 2004, Pretorius, Warner & Woudt 2006 and references therein), but an important topic is their link to the 'quasi-periodic oscillations' sometimes seen in dwarf novae.…”

Section: Temporary Magnetospheres: Dnosmentioning

confidence: 99%

Disc–magnetosphere interactions in cataclysmic variable stars

Hellier¹

2007

Proc. IAU

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Abstract. I review, from an observational perspective, the interactions of accretion discs with magnetic fields in cataclysmic variable stars. I start with systems where the accretion flows via a stream, and discuss the circumstances in which the stream forms into an accretion disc, pointing to stars which are close to this transition. I then turn to disc-fed systems and discuss what we know about how material threads on to field lines, as deduced from the pattern of accretion footprints on the white dwarf. I discuss whether distortions of the field lines are related to accretion torques and the changing spin periods of the white dwarfs. I also review the effect on the disc-magnetosphere interaction of disc-instability outbursts. Lastly, I discuss the temporary, dynamo-driven magnetospheres thought to occur in dwarf-nova outbursts, and whether slow-moving waves are excited at the inner edges of the disc.

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Section: Temporary Magnetospheres: Dnosmentioning

confidence: 99%

Disc–magnetosphere interactions in cataclysmic variable stars

Hellier¹

2007

Proc. IAU

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“…They are generally divided into two types: DNOs and QPOs, which were most detected in the DN during outburst and many NLs. A review article have been given by Warner (2004). Normally, DNOs have low-amplitude oscillations in brightness with short periods, and QPOs are longer timescale modulations with larger amplitude.…”

Section: Dnos and Qpos In V729 Sgrmentioning

confidence: 99%

Long-term photometric behavior of the eclipsing cataclysmic variable V729 Sagittarii

Han

Qian

Lajús

et al. 2017

Publications of the Astronomical Society of Japan

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We present the analysis results of an eclipsing cataclysmic variable (CV) V729 Sgr, based on our observations and AAVSO data. Some outburst parameters were determined such as outburst amplitude (A n ) and recurrence time (T n ), and then the relationship between A n and T n is discussed. A cursory examination for the long-term light curves reveals that there are small-amplitude outbursts and dips present, which is similar to the behaviors seen in some nova-like CVs (NLs). More detailed inspection suggests that the outbursts in V729 Sgr may be Type A (outside-in) with a rise time ∼ 1.76 d. Further analysis also shows that V729 Sgr is an intermediate between dwarf nova and NLs, and we constrain its mass transfer rate to 1.59 × 10 −9 <Ṁ 2 < 5.8 × 10 −9 M ⊙ yr −1 by combining the theory for Z Cam type stars with observations. Moreover, the rapid oscillations in V729 Sgr were detected and analyzed for the first time. Our results indicate that the oscillation at ∼ 25.5 s is a true DNO, being associated with the accretion events. The classification of the oscillations at ∼ 136 and 154 s as lpDNOs is based on the relation between P lpDN Os and P DN Os . Meanwhile, the QPOs at the period of hundreds of seconds are also detected.

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“…The rich phenomenology of oscillations in CVs has been reviewed recently by Warner (2004). There are at least three distinct types of rapid oscillation in CVs, which can exist separately or simultaneously:…”

Section: Oscillations In Cvsmentioning

confidence: 99%

“…These have been interpreted in terms of the LIMA model (WW1), where the magnetic field of the primary is strong enough to prevent easy slippage of the equatorial belt in quiescence (Warner 2004), in which case the 27.87 s period should be thought of as an lpDNO.…”

Section: Wz Sagittaementioning

confidence: 99%