A Preliminary Timing Analysis of two Intermediate Polars: UU Col and Swift J0939.7-3224
Nikita Rawat,
Aryabhatta Research Institute of observational sciencES (ARIES), Nainital 263001, India and Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur 273009, India. Corresponding author: rawatnikita221@gmail.com
Jeewan Chandra Pandey,
Aryabhatta Research Institute of observational sciencES (ARIES), Nainital 263001, India
Arti Joshi,
Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Srinivas M. Rao,
Aryabhatta Research Institute of observational sciencES (ARIES), Nainital 263001, India
Michaël De Becker,
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège, Quartier Agora, 19c, Allée du 6 Août, B5c, B-4000 Sart Tilman, Belgium
Abstract
We present the preliminary timing analysis of confirmed intermediate polar UU Col and possible intermediate polar Swift J0939.7-3224 in the optical band with the help of long-term, high-cadence continuous photometry from Transiting Exoplanet Survey Satellite (TESS). For UU Col, we revise previously reported orbital and spin periods as 3.464 ± 0.005 h and 863.74 ± 0.08 s, respectively. Using the second harmonic of the beat frequency, the beat period is estimated as ∼928 s. These findings indicate that UU Col is a disc-fed dominated disc-overflow accretor. For J0939, we establish the spin period as 2671.8 ± 0.8 s and refine the provisionally suggested orbital period as 8.49 ± 0.03 h. The absence of beat frequency in J0939 signifies that it might be a pure disc-fed accretor; however, an X-ray study of this source will help to understand its true nature.
Keywords : Cataclysmic Variable, Intermediate polars (UU Col, Swift J0939.7-3224), Accretion flow
Pour citer cet article
Nikita Rawat, Jeewan Chandra Pandey, Arti Joshi, Srinivas M. Rao & Michaël De Becker, «A Preliminary Timing Analysis of two Intermediate Polars: UU Col and Swift J0939.7-3224», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 648-656 URL : https://popups.uliege.be/0037-9565/index.php?id=11826.
