I realise the interest is in photometry & spectroscopy, but noticed in P.Roche paper [1] that some polarisation measurements were referenced, so thought I’d try a few measurements. The table gives the calculated normalised intrinsic polarisations [%].
|
Band |
18/11/2018 |
14/11/2019 |
19/11/2019 |
|
U |
– |
– |
0.44 +/-0.12 |
|
B |
– |
0.54 +/-0.10 |
0.51 +/-0.08 |
|
V |
0.63 +/-0.07 |
0.59 +/-0.09 |
0.60 +/-0.07 |
|
Rc |
– |
0.62 +/-0.08 |
0.58 +/-0.08 |
The attached figure shows these in relation to results referred to in ref.[1] as Extended Low and Fading stages. The calculated average circumstellar disc polarisation angle is 173.2 +/-4 deg compared to ref. [1] value 171 +/-0.7 deg.
[1] Observations of the recent disc loss in X Persei Astronomy & Astrophysics 322, 139-146 [1997]
#EDIT corrected uploaded image & table !!