RZ Eridani / RZ Eri
Light curves and phase diagram of the EA/DS/RS type eclipsing binary RZ Eridani / RZ Eri.
Data from three observing runs has been obtained (not good practice, but needs must...) all using the same comparison stars.
Run 1 - in black in the diagrams.
46 images taken with the Bradford Robotic Telescope Cluster Camera (a 180mm fl telephoto lens, (BRT)) between 2013 September 15 and 2016 October 1, through a tri-colour green filter.
Run 2 - in red in the diagrams
152 images taken with the original Open University COAST Telescope (a 14 inch / 35cm Schmidt-Cassegrain) between 2017 August 4 and 2021 April 1, through a V filter.
Run 3 - in blue in the diagrams
26 images taken with the upgraded 'MkIII' COAST telescope (a 17 inch / 42cm corrected Dall-Kirkham) between 2021 August 21 and 2022 April 5, through a V filter. CcDK17 corrected Dall-KirkhamCDK17 corrected Dall-Kirkham
Run 1 - in black in the diagrams.
46 images taken with the Bradford Robotic Telescope Cluster Camera (a 180mm fl telephoto lens, (BRT)) between 2013 September 15 and 2016 October 1, through a tri-colour green filter.
Run 2 - in red in the diagrams
152 images taken with the original Open University COAST Telescope (a 14 inch / 35cm Schmidt-Cassegrain) between 2017 August 4 and 2021 April 1, through a V filter.
Run 3 - in blue in the diagrams
26 images taken with the upgraded 'MkIII' COAST telescope (a 17 inch / 42cm corrected Dall-Kirkham) between 2021 August 21 and 2022 April 5, through a V filter. CcDK17 corrected Dall-KirkhamCDK17 corrected Dall-Kirkham
Note that this star, at mag 7.7 to 8.7 approximately, requires exposures of less than two seconds on the COAST system to avoid saturation. This is too short of get good data, but the absence of neutral density filters on this system precludes longer exposures.
The catalogue periods for this star are 39.28238d (GCVS, AAVSO VSX and Kreiner). There is little o-c activity reported for this star (Kreiner). (Accessed 2022 June 4.)
There is some possible evidence of a secondary minimum at phase ~0.67. This has been discussed in a number of articles, eg Caton and Oliver (1979), Burki, Kviz and North (1992) and Vivekananda Rao, Sarma and Prakash Rao (1994).
The full classification of the variability type of this system is EA/DS/RS (GCVS), which includes an RS CVn component. Notwithstanding the short exposures used in generating these results, some scatter at least might be due to the variabilty of RZ Eri B (Burki et al, op cit).
The full classification of the variability type of this system is EA/DS/RS (GCVS), which includes an RS CVn component. Notwithstanding the short exposures used in generating these results, some scatter at least might be due to the variabilty of RZ Eri B (Burki et al, op cit).
[This page updated 2022 June 4]