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The companion to R is very close and trying to do a visual estimation of the variability will be a lot harder. In the system there's the EA binary, R Ara, and then a close by visual companion (3.3") only a shade dimmer than R itself. It's that close by companion which throws in the extra spanner, for visual observations.
Eclipses in binary systems only occur if the orbital inclination is favourable from our perspective. In EA systems, most only show partial secondaries at best and to detect some of them you need fairly sensitive instruments.
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