Interaction of an Accretion Disk with the Magnetosphere of a Star: the Magnetic Propeller Effect in the Ballistic Approximation

Shulman, S. G.

doi:10.1007/s10511-015-9381-x

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…For RZ Psc, which is well characterized but not well understood (Grinin et al 2010), several scenarios have been put forward to explain the photometric variability. These range from the presence of an asteroid belt (de Wit et al 2013) to magnetic propeller effects (Grinin et al 2015) or disc-magnetosphere interactions (Shulman 2015). Despite the large amount of available data, no theoretical framework is at present able to unambiguously identify the geometry of the system, nor the origin of the photometric variability.…”

Section: Cxb12 = Cxogbs J1752332-293944 a Candidate Symbiotic Binarmentioning

confidence: 99%

Spectroscopic classification of X-ray sources in the Galactic Bulge Survey

Wevers

Torres

Jonker

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the classification of 26 optical counterparts to X-ray sources discovered in the Galactic Bulge Survey. We use (time-resolved) photometric and spectroscopic observations to classify the X-ray sources based on their multi-wavelength properties. We find a variety of source classes, spanning different phases of stellar/binary evolution. We classify CX21 as a quiescent cataclysmic variable (CV) below the period gap, and CX118 as a high accretion rate (nova-like) CV. CXB12 displays excess UV emission, and could contain a compact object with a giant star companion, making it a candidate symbiotic binary or quiescent low mass X-ray binary (although other scenarios cannot be ruled out). CXB34 is a magnetic CV (polar) that shows photometric evidence for a change in accretion state. The magnetic classification is based on the detection of X-ray pulsations with a period of 81 ± 2 min. CXB42 is identified as a young stellar object, namely a weak-lined T Tauri star exhibiting (to date unexplained) UX Ori-like photometric variability. The optical spectrum of CXB43 contains two (resolved) unidentified double-peaked emission lines. No known scenario, such as an AGN or symbiotic binary, can easily explain its characteristics. We additionally classify 20 objects as likely active stars based on optical spectroscopy, their X-ray to optical flux ratios and photometric variability. In 4 cases we identify the sources as binary stars.

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