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I have prepared a new chart for one of the most interesting changing period miras, that incredible was observed by a lot of people with the most terrible AAVSO chart that ever existed. The b chart for R Aquilae showed up to 1.2 mag. differences between its values and the V magnitudes from the ground or Tycho-2. This is a comparison between the old chart values for stars now included in my new one: AAVSO V B-V 66 6.29 1.6 67 6.71 0.4 71 7.20 0.3 74 7.44 0.4 76 7.49 0.9 78 8.44 1.3 79 8.53 0.4 83 8.84 0.1 85sw 8.93 2.0 85w 9.65 0.7 88 9.29 2.0 89 9.32 0.5 91 9.36 1.4 95ssw 9.73 1.1 95s 9.53 0.6 101 10.35 0.7 111w 11.28 0.3 111nw 11.31 1.0 115nw 11.57 0.5 Unbelievable. Between the 76 and 78 comparison stars there is almost a full magnitude difference and not just 0.2. One of the "85"s is actually 9.65 !!!! I can imagine a false standstill when the star is between 7.6 and 7.8.... And if someone goes on to determine the limitting magnitude of his/her binoculars, stars that are supposedly easy to find, won't even be observed at all !! Errors are not systematically bound to colors or a zero-point problem. They are random so the resulting lightcurve is not truly representative of this very important mira. The charts (binocular and telescopic) are at: http://ar.geocities.com/varsao/Carta_R_Aql.htm http://ar.geocities.com/varsao/Carta_R_Aql_tel.htm There is also a chart for R Normae, another changing period mira: http://ar.geocities.com/varsao/Carta_R_Nor.htm Good observing, Sebastian.
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