A preliminary timing analysis of two intermediate polars: UU Col and  Swift J0939.7-3224

[en] 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 $\pm$ 0.005 h and 863.74 $\pm$ 0.08 s, respectively. Using the second harmonic of the beat frequency, the beat period is estimated as $\sim$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 $\pm$ 0.8 s and refine the provisionally suggested orbital period as 8.49 $\pm$ 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.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Rawat, Nikita

Pandey, J. C.

Joshi, Arti

M Rao, Srinivas

De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Sciences spatiales

Language :

English

Title :

A preliminary timing analysis of two intermediate polars: UU Col and Swift J0939.7-3224

Publication date :

11 June 2024

Event name :

Third BINA workshop: Scientific potential of the Indo-Belgian cooperation

Event place :

Bhimtal, India

Event date :

22-24 March 2023

Audience :

International

Journal title :

Bulletin de la Société Royale des Sciences de Liège

ISSN :

0037-9565

eISSN :

1783-5720

Publisher :

Société Royale des Sciences de Liege, Liège, Belgium

Volume :

Issue :

Pages :

648-656

Peer reviewed :

Peer reviewed

Additional URL :

https://popups.uliege.be/0037-9565/index.php?id=11826

Available on ORBi :

since 16 April 2024

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Bibliography

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