Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar-Reference-Cited by-同舟云学术

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

Published:2024-05-06 Issue:1 Volume:532 Page:L21-L26
ISSN:1745-3925
Container-title:Monthly Notices of the Royal Astronomical Society: Letters
language:en
Short-container-title:

Author:

Potter Stephen B¹²^ORCID,Buckley David A H¹³⁴^ORCID,Scaringi S⁵^ORCID,Monageng I M¹³^ORCID,Egbo Okwudili D¹³,Charles Philip A⁴⁶,Erasmus N¹,van Gend Carel¹,Loubser Egan¹,Titus Keegan¹,Rosie Kathryn¹,Gajjar Hitesh¹,Worters H L¹,Chandra Sunil¹⁷^ORCID,Julie R P M⁸,Hlakola Moloko¹

Affiliation:

1. South African Astronomical Observatory , PO Box 9, Observatory 7935, Cape Town , South Africa

2. Department of Physics, University of Johannesburg , PO Box 524, Auckland Park 2006 , South Africa

3. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa

4. Department of Physics, University of the Free State , PO Box 339, Bloemfontein 9300 , South Africa

5. Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE , UK

6. Department of Physics and Astronomy, University of Southampton , Southampton, SO17 1BJ , UK

7. Center for Space Research, North-West University , Potchefstroom 2520 , South Africa

8. South African Radio Astronomy Observatory , 2 Fir Street, Observatory 7925, Cape Town , South Africa

Abstract

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.

Funder

MAST

National Research Foundation

STFC

NRF

Publisher

Oxford University Press (OUP)

Link

https://academic.oup.com/mnrasl/advance-article-pdf/doi/10.1093/mnrasl/slae038/57421310/slae038.pdf

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