1. Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar.
- Author
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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, and Hlakola, Moloko
- Subjects
X-rays ,ASTRONOMICAL observatories ,CLASSIFICATION ,ACCRETION disks ,TELESCOPES ,STELLAR magnetic fields - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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