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2024MNRAS.532L..21P - Mon. Not. R. Astron. Soc., 532, L21-L26 (2024/July-3)

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

POTTER S.B., BUCKLEY D.A.H., SCARINGI S., MONAGENG I.M., EGBO O.D., CHARLES P.A., ERASMUS N., VAN GEND C., LOUBSER E., TITUS K., ROSIE K., GAJJAR H., WORTERS H.L., CHANDRA S., JULIE R.P.M. and HLAKOLA M.

Abstract (from CDS):

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 Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): accretion, accretion discs - stars: individual: EP J115415.8-501810 - novae, cataclysmic variables

Simbad objects: 8

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