Name: Kala G Pradeep
Affiliation: IISER
Conference ID : ASI2022_405
Title : AstroSat observations in NUV, FUV and soft X-rays of Magnetic Cataclysmic Variables: BL Hyi, SwiftJ0503.7-2819 and TV Col
Authors : Kala G Pradeep and Kulinder Pal Singh
Abstract Type: Poster
Abstract Category : Stars, ISM and Galaxy
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.