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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

(Volume 93 - Année 2024 — No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation)
DOI: 10.25518/0037-9565.11826
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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

Para citar este artículo

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 : http://popups.ulg.be/0037-9565/index.php?id=11826.

Acerca de: 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

Acerca de: Jeewan Chandra Pandey

Aryabhatta Research Institute of observational sciencES (ARIES), Nainital 263001, India

Acerca de: Arti Joshi

Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile

Acerca de: Srinivas M. Rao

Aryabhatta Research Institute of observational sciencES (ARIES), Nainital 263001, India

Acerca de: 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