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Orestis,
It's not crucial that the experiment "works" exactly to expectation. That's science! You construct your aim, experimental method and gather results. Then analyse and draw your conclusions. If everything does not go to plan e.g. as compared to historical values , you put forward possible reasons for deviation or the inability to reproduce results e.g. equipment used, not enough variation in magnitude or the closeness of the companion to R.
I calculate that visual observations of the composite star (R & companion mag 7.8) should vary from about mag 6 to 6.8 based on the 6.2 to 7.3 for R Arae itself. In comparing historical values you should factor this in.
Here is a table to help you with the composite magnitudes ...
R + companion at 3.3" ---> composite magnitude of the two
6.2, 7.8, 6
6.5, 7.8, 6.2
6.7, 7.8, 6.4
6.9, 7.8, 6.5
7.1, 7.8, 6.6
7.3, 7.8, 6.8
Regards, Rob
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