Remarks:
PA is from north over east to south, after correcting for the detector orientation.
(a) Absolute errors; (b) relative errors;
(c) no relative errors available, because another astrometric calibration binary was observed;
(d) significance in Gaussian 
against background (b/g) hypothesis for each epoch
compared to the first new epoch (2005.4) regarding (re) PA (Fig. 1) and separation (Fig. 2);
the background hypothesis is that the companion is a non-moving background object,
in which case GQ Lupi A would move away due to its known proper motion.
The significances compared from the three earlier observations from 1994 to
2002 are 5.4, 7.0, and 6.9
for separation, respectively,
and 7.6 and 8.3
for PA of 2005.4 compared to 1999 and 1994, respectively;
(e) the significance for deviation of each separation value from the 2005.4
value is given in the last column (see Fig. 2b).
It can be seen as evidence for orbital motion;
(d, e) because the measurements are independent, we can add up the significances (properly)
and obtain altogether very high significance against the background hypothesis
and  
for having detected orbital motion.
|
