| Abstract : | We present temporal and spectral studies of three Magnetic Cataclysmic Variables namely, BL Hyi,
SwiftJ0503.7-2819 and TV Col in UV and X-Ray, based on the observations obtained from Ultra-Violet
Imaging Telescope (UVIT) and Soft X-ray Telescope (SXT) onboard AstroSat. A comparative analysis
of the simultaneous variations in X-ray and UV facilitates a detailed study of the aperiodic and
periodic features that are characteristic of MCVs and help ascertain the source of these emissions
and decipher the myriad processes that are at play. The systems, imaged in FUV (1300-1800nm),
NUV (2000-3000nm) and in the Soft X-ray region of 0.3-8 keV along with the respective intensity
variations are presented. The timing analysis of the Polar, BL Hyi observed with the AstroSat on July
2016, reveals the system to be in its low state (marked by a slow rate of accretion) with an average
FUV flux of 4.38 X 10 -15 ergs s-1 cm-2. Soft X-ray spectrum and allied investigations along with a low-resolution spectroscopic analysis with the NUV grating are also presented, shedding light into the
emission/absorption features. SwiftJ0503.7-2819 is a newly discovered Intermediate Polar,
observed by AstroSat in July 2020 in the FUV and soft X-rays. Not much is known about the source
and the study presented would be the first of its kind delving into its multi-wavelength
characteristics. TV Col, also an intermediate polar is peculiar in having multiple reported
periodicities, including a 32 min spin period, a 5.2h photometric period, two superhump periods of
5.6h & 6.4h and a 4 day beat period. AstroSat observed TV Col in the FUV, NUV, and soft X-rays on
January 2018. The timing and spectral properties of the system are presented and the possible
causes behind the many periodicities are discussed along with the emission/absorption features. |
