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29 March 2024
 
  » arxiv » 2001.6036

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A spectroscopic, photometric, polarimetric and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations
Zwidofhelangani N. Khangale ; Stephen B. Potter ; Patrick A. Woudt ; David A. H. Buckley ; Andrey N. Semena ; Enrico J. Kotze ; Danièl N. Groenewald ; Dante M. Hewitt ; Margaretha L. Pretorius ; Rob P. Fender ; Paul Groot ; Steven Bloemen ; Marc Klein-Wolt ; Elmar Körding ; Rudolf Le Poole ; Vanessa A. McBride ; Lee Townsend ; Kerry Paterson ; Danielle L. A. Pieterse ; Paul M. Vreeswijk ;
Date 16 Jan 2020
AbstractWe present phase-resolved spectroscopy, photometry and circular spectropolarimetry of the eclipsing polar UZ Fornacis. Doppler tomography of the strongest emission lines using the inside-out projection revealed the presence of three emission regions: from the irradiated face of the secondary star, the ballistic stream and the threading region, and the magnetically confined accretion stream. The total intensity spectrum shows broad emission features and a continuum that rises in the blue. The circularly polarized spectrum shows the presence of three cyclotron emission harmonics at $sim$4500 AA{}, 6000 AA{} and 7700 AA{}, corresponding to harmonic numbers 4, 3, and 2, respectively. These features are dominant before the eclipse and disappear after the eclipse. The harmonics are consistent with a magnetic field strength of $sim$57 MG. We also present phase-resolved circular and linear photopolarimetry to complement the spectropolarimetry around the times of eclipse. MeerKAT radio observations show a faint source which has a peak flux density of 30.7 $pm$ 5.4 $mu$Jy/beam at 1.28 GHz at the position of UZ For.
Source arXiv, 2001.6036
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