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Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar

Potter, Stephen B; Buckley, David A H; Scaringi, S; Monageng, I M; Egbo, Okwudili D; Charles, Philip A; Erasmus, N; van Gend, Carel; Loubser, Egan; Titus, Keegan; Rosie, Kathryn; Gajjar, Hitesh; Worters, H L; Chandra, Sunil; Julie, R P M; Hlakola, Moloko

Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar Thumbnail


Authors

Stephen B Potter

David A H Buckley

I M Monageng

Okwudili D Egbo

Philip A Charles

N Erasmus

Carel van Gend

Egan Loubser

Keegan Titus

Kathryn Rosie

Hitesh Gajjar

H L Worters

Sunil Chandra

R P M Julie

Moloko Hlakola



Abstract

We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital period of 3.7614(4) h and a white dwarf spin period of 3.97 min. The orbital period was identified through TESS observations, while our high-speed photometric data, obtained using the 1.9m and Lesedi 1.0m telescopes at the South African Astronomical Observatory, revealed both the spin and beat periods. Additionally, we present orbitally phase-resolved spectroscopic observations using the 1.9m telescope, specifically centred on the H β emission line, which reveal two emission components that exhibit Doppler variations throughout the orbital cycle.

Journal Article Type Article
Acceptance Date Apr 29, 2024
Online Publication Date May 6, 2024
Publication Date May 20, 2024
Deposit Date Jul 8, 2024
Publicly Available Date Jul 8, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 532
Issue 1
Pages L21-L26
DOI https://doi.org/10.1093/mnrasl/slae038
Public URL https://durham-repository.worktribe.com/output/2521659

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