V413 Aquilae / V413 Aql
Light curve and phase diagram of the EA+ZAND type eclipsing binary V413 Aquilae / V413 Aql.
These have been constructed from photometry of 104 images taken with the Open University COAST telescope between 2017 July 12 and 2020 December 10. The images were taken using a V filter.
The increase in brightness from JD 2459127 (2020 October 4) is probably due to one of the components being a Z And type variable, as listed in the AAVSO VSX data. An outburst was observed in 2006 (vsnet-alert 10534), and Doppler Tomography studies have also been carried out on this system (Echevarria 2012). The phase diagram appears to show the light curve returning to 'normal' immediately after this increase in brightness, but this is an artefact of including a spurious event in the phase plot. The light curve is a more realistic indicator of the behaviour of the system in this respect.
UPDATE 2022 January 10
A further 27 images were taken with the COAST telescope between 2021 February 23 and 2021 December 10. The resulting photometry has been added to the above data to produce the following light curve and phase diagram - newer data in red.
Update 2023 January 9
A further 18 usable images were taken with the COAST telescope between 2022 February 12 and 2022 November 25. The resulting photometry has been added to the above data to produce the following light curve and phase diagram - this newer data is in red.
Update 2024 January 3
A further 31 usable images were taken with the COAST telescope between 2023 February 13 and 2023 December 12. The resulting photometry has been added to the above data to produce the following light curve and phase diagram - this newer data is in red. (The gap is due to technical issues with the COAST system.)
ASAS data shows that the light curve between primary minima is not necessarily the same from one cycle to the next, nor always symmetrical around phase 0.5.
The catalogue period of this star is 425.3 days (GCVS) and 426.53 days (AAVSO VSX) [Accessed 2024 January 3]
The catalogue period of this star is 425.3 days (GCVS) and 426.53 days (AAVSO VSX) [Accessed 2024 January 3]
[This page updated 2024 January 3]