Stokes imaging, Doppler mapping and Roche tomography of the AM Her system V834 Cen

Abstract

We report on new simultaneous phase resolved spectroscopic and polarimetric observations of the polar (AM Herculis star) V834 Cen during a high state of accretion. Strong emission lines and high levels of variable circular and linear polarization are observed over the orbital period. The polarization data is modelled using the Stokes imaging technique of Potter et al. The spectroscopic emission lines are investigated using the Doppler tomography technique of Marsh and Horne and the Roche tomography technique of Dhillon and Watson. Up to now all three techniques have been used separately to investigate the geometry and accretion dynamics in Cataclysmic Variables. For the first time, we apply all three techniques to simultaneous data for a single system. This allows us to compare and test each of the techniques against each other and hence derive a better understanding of the geometry, dynamics and system parameters of V834 Cen.

arXiv comment10 pages, 8 figures; Accepted for publication in MNRAS

References in corpus (5)

• Determining the mass of the accreting white dwarf in magnetic CVs using data
• Multi-epoch Doppler tomography and polarimetry of QQ Vul
• Roche tomography of cataclysmic variables: I. artefacts and techniques
• Modelling of the magnetic accretion flow in HU Aquarii
• Roche tomography of cataclysmic variables -- II. Images of the secondary stars in AM Her, QQ Vul, IP Peg and HU Aqr

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• Exploring inside-out Doppler tomography: magnetic cataclysmic variables
• Driving the Beat: Time-Resolved Spectra of the White Dwarf Pulsar AR Scorpii
• The Magnetospheric Boundary in Cataclysmic Variables
• Discovery of spin modulated circular polarization from IGR J17014-4306, the remnant of Nova Scorpii 1437 A.D
• The age of cataclysmic variables: a kinematical study
• Optical polarimetry and infrared photometry of two AM Her binaries: 1RXS J161008.0+035222 and 1RXS J231603.9-052713
• A VLT-ULTRACAM study of the fast optical quasi-periodic oscillations in the polar V834 Centauri
• Stokes imaging of AM Her systems using 3D inhomogeneous models - I. Description of the code and an application to V834 Cen
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• Polarimetry of binary systems: polars, magnetic CVs, XRBs
• Optical observations and cyclops post-shock region modelling of the polar V348 Pav
• A spectroscopic, photometric, polarimetric and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations
• A tomographic study of V691 CrA (X1822-371)
• The effect of two-temperature post-shock accretion flow on the linear polarization pulse in magnetic cataclysmic variables