[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 :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège [BE]
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 :
In press
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
Peer reviewed :
Peer reviewed
Commentary :
9 pages, 3 figures, 2 tables. Proceeding paper of the 3$^{rd}$
Belgo-Indian Network for Astronomy and Astrophysics (BINA) workshop, Accepted
for publication in the Bulletin of Li\`{e}ge Royal Society of Sciences
