A spectroscopic, photometric, polarimetric, and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations

Khangale, Z. N.; Potter, S.; Woudt, P. A.; Buckley, D.; Семена, А. Н.; Kotze, E. J.; Groenewald, D.; Hewitt, D. M.; Pretorius, M.; Fender, R. P.; Groot, P.; Bloemen, S.; Klein-Wolt, M.; Körding, Elmar; Poole, R. Le; McBride, V. A.; Townsend, L. J.; Paterson, K.; Pieterse, D. L. A.; Vreeswijk, P. M.

doi:10.1093/mnras/staa080

Cited by 2 publications

(1 citation statement)

References 65 publications

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“…4 Photometric, spectrometric, and polarimetric studies can be done in conjunction with optical telescopes including the South African Large Telescope and a smaller robotic telescope (MeerLICHT) that follows MeerKAT's field of view. 5 An important design goal, which is to perform time domain science, has been largely achieved due to the relatively compact core and recent promising observations. [6][7][8] Some pulsars' stability of the order of 4 ns • h −1 is now projected based on MeerKAT measurements.…”

Section: Introductionmentioning

confidence: 99%

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

Burger

Siebrits

Gamatham

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The details of the MeerKAT radio telescope's time and frequency reference subsystem that enables sampling via low-jitter, low-drift microwave clock signals, and absolute timing (≤5 ns accurate) are discussed. The subsystem's microwave and pulse per second transmission parts are now fully qualified and commissioned for the ultra high frequency (UHF) and L-bands and also provide for a 100-MHz interface and timing interfaces for S-band receivers that were installed. The subsystem includes a cable measurement system called the Karoo array timing system (KATS). Performance and differences on different bands and seasonal drift of the cable delay measurement of KATS are reported. A time scale called the Karoo Telescope Time (KTT) (which is estimated from tracking a few atomic clocks via new software) and the issuing of timing bulletins to users have been largely implemented and verified. Absolute timing calibration and linkage of KTT to the global positioning system time scale and to different UTC(k) realizations of the Coordinated Universal Time (UTC) instances are described. The subsystem uniquely enables high-fidelity sampling and stable tied array configuration. The latter configuration enables timing and transient science over time spans of 5 to 10 years. Simultaneous subarraying is supported. The backend is unique for radio telescopes in terms of being very deterministic as far as timing is concerned.

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Section: Introductionmentioning

confidence: 99%

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

Burger

Siebrits

Gamatham

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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

Potter,

Buckley,

Scaringi

et al. 2024

Monthly Notices of the Royal Astronomical Society: Letters

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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) hours and a white dwarf spin period of 3.97 minutes. 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 centered on the Hβ emission line, which reveal two emission components that exhibit Doppler variations throughout the orbital cycle.

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A spectroscopic, photometric, polarimetric, and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations

Cited by 2 publications

References 65 publications

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

Design, implementation, and qualification of high-performance time and frequency reference for the MeerKAT telescope

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

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