| Abstract : | Magnetic Cataclysmic Variables (MCVs) are binary systems with a magnetized White Dwarf primary accreting material from its Roche lobe filling red-dwarf companions, exhibiting complex accretion patterns and emission across broad wavebands showcasing intensity variations. Thus, a multi-wavelength study is essential to understand these systems which are facilitated by Ultra-Violet Imaging Telescope (UVIT) and Soft X-Ray Telescope (SXT), onboard AstroSat. We present here a detailed UV and X-ray timing and spectral analysis of three MCVs, viz. AR UMa, QS Tel, and 1RXS J161935.7+524630. We used CCDLAB software package to reduce the UVIT data and Curvit for extracting FUV and NUV lightcurves, revealing the underlying periodicities. HEASoft utilities are used to extract the X-Ray lightcurves and spectra, and to determine the best fit spectral models and parameter values.
AR UMa (AR Ursae Majoris) has the strongest magnetic field found in an accreting Polar and was observed by AstroSat, in May 2016. From timing analysis, we found that its orbital period is 1.93h, in concordance with the literature. We report that the system was in its low state, and no soft X-ray emission was detected with the SXT. We find that its mean magnitude in NUV is 16.18±0.2 and 15.95±0.28 in FUV. QS Telescopii (QS Tel), an MCV containing 50-80 MG White-Dwarf lies in the period-gap of CVs, was observed in Aug 2017. It shows an orbital period of 2.33h and the UVIT observations suggest that the system was in its low state having mean NUV and FUV magnitude of 17.07±0.42 and 17.05±0.57 respectively. 1RXSJ161935.7+524630 (DDE 32), a newly discovered MCV located in the constellation of Draco, was observed in July 2017. This is the first-ever multi-wavelength study on this MCV. By observing in both UV and X-Ray regimes, we co-relate the spectral energy distributions, fluxes, and spectral variations of these systems. |
