Table 2: Weighted mean linear polarization parameters of HD 31648. N is the number of individual measurements in each data point, $\sigma _{\rm p}$ and $\sigma _{\theta }$ are the estimated errors of the weighted mean values of the polarization degree and of the position angle, respectively.
Date/ N Band P $\sigma _{\rm p}$ $\theta$ $^\circ$ $\sigma_{\theta}\hbox{$^\circ$ }$ Date/ N Band P $\sigma _{\rm p}$ $\theta$ $^\circ$ $\sigma_{\theta}\hbox{$^\circ$ }$

JD 2 400 000+ % % JD 2 400 000+ % %

01.11.96 40 U 0.094 0.014 14.3 5.1 07.11.96 18 U 0.198 0.020 32.9 3.6

50 389.39 B 0.205 0.009 33.3 1.7 50 395.33 B 0.192 0.012 53.9 2.2

V 0.243 0.012 39.6 1.8 V 0.312 0.017 49.5 2.4

R 0.305 0.009 42.6 0.9 R 0.310 0.012 51.4 1.2

I 0.317 0.012 46.4 1.2 I 0.334 0.017 52.0 1.4

01.11.96 49 U 0.134 0.013 25.3 3.8 07.11.96 8 U 0.108 0.025 48.3 8.1

50 389.58 B 0.209 0.008 39.4 1.7 50 395.62 B 0.220 0.015 51.9 2.5

V 0.252 0.011 37.7 1.6 V 0.280 0.021 49.3 2.4

R 0.324 0.008 41.6 1.0 R 0.337 0.015 51.1 1.3

I 0.358 0.011 44.0 1.0 I 0.381 0.021 57.0 1.5

04.11.96
24 U 0.212 0.019 19.3 3.4 08.11.96 25 U 0.126 0.16 39.5 5.8

50 392.33 B 0.233 0.012 41.7 1.5 50 396.46 B 0.198 0.010 50.6 2.2

V 0.264 0.015 44.4 1.9 V 0.236 0.014 48.6 2.0

R 0.309 0.011 45.4 1.5 R 0.321 0.011 53.4 1.4

I 0.339 0.015 48.0 1.4 I 0.325 0.014 57.1 1.8

04.11.96 32 U 0.073 0.014 22.4 6.3 09.11.96 52 U 0.092 0.018 36.0 8.9

50 392.41 B 0.220 0.009 45.4 1.7 50 397.37 B 0.181 0.011 59.2 3.2

V 0.227 0.012 45.9 1.9 V 0.187 0.014 62.4 3.7

R 0.336 0.009 47.1 1.3 R 0.282 0.011 59.8 2.4

I 0.381 0.013 49.8 1.4 I 0.371 0.015 58.9 1.8

04.11.96 16 U 0.175 0.021 26.6 4.5 28.03.98 8 U 0.238 0.044 14.4 8.1

50 392.62 B 0.197 0.013 48.7 2.9 50 901.31 B 0.254 0.025 37.1 4.2

V 0.247 0.018 47.0 2.2 V 0.358 0.031 48.4 3.0

R 0.299 0.013 50.1 2.0 R 0.336 0.031 50.8 2.2

I 0.376 0.018 48.7 1.8 I 0.372 0.029 37.7 3.4

05.11.96 23 U 0.195 0.016 35.9 3.4 30.03.98 14 U 0.337 0.030 34.7 7.7

50 393.50 B 0.186 0.010 47.0 1.9 50 903.27 B 0.288 0.017 35.1 3.8

V 0.265 0.014 49.4 1.6 V 0.308 0.021 42.5 2.3

R 0.327 0.011 50.9 1.3 R 0.297 0.016 43.3 2.3

I 0.360 0.015 52.5 1.2 I 0.309 0.020 43.8 2.5

05.11.96 36 U 0.111 0.013 37.2 4.5 31.03.98 9 U 0.119 0.048 42.3 14.2

50 393.59 B 0.229 0.008 47.8 1.5 50 904.26 B 0.308 0.025 43.1 3.3

V 0.281 0.011 49.0 1.5 V 0.245 0.030 44.2 6.1

R 0.343 0.009 53.6 1.0 R 0.395 0.021 49.3 4.3

I 0.396 0.012 53.4 1.0 I 0.531 0.028 51.4 3.2

06.11.96 12 U 0.233 0.037 48.7 4.9 01.04.98 8 U 0.100 0.033 30.4 14.2

50 394.32 B 0.244 0.022 49.1 3.6 50 905.25 B 0.277 0.020 41.3 3.4

V 0.188 0.029 35.1 5.0 V 0.278 0.026 43.1 2.3

R 0.334 0.022 55.5 2.2 R 0.343 0.019 52.2 2.2

I 0.354 0.030 48.3 3.0 I 0.381 0.026 51.1 2.2

**Table 2:** Weighted mean linear polarization parameters of HD 31648. N is the number of individual measurements in each data point, $\sigma _{\rm p}$ and $\sigma _{\theta }$ are the estimated errors of the weighted mean values of the polarization degree and of the position angle, respectively.
Date/	N	Band	P	$\sigma _{\rm p}$	$\theta$ $^\circ$	$\sigma_{\theta}\hbox{$^\circ$ }$	Date/	N	Band	P	$\sigma _{\rm p}$	$\theta$ $^\circ$	$\sigma_{\theta}\hbox{$^\circ$ }$
JD 2 400 000+			%	%			JD 2 400 000+			%	%
01.11.96	40	U	0.094	0.014	14.3	5.1	07.11.96	18	U	0.198	0.020	32.9	3.6
50 389.39		B	0.205	0.009	33.3	1.7	50 395.33		B	0.192	0.012	53.9	2.2
		V	0.243	0.012	39.6	1.8			V	0.312	0.017	49.5	2.4
		R	0.305	0.009	42.6	0.9			R	0.310	0.012	51.4	1.2
		I	0.317	0.012	46.4	1.2			I	0.334	0.017	52.0	1.4
01.11.96	49	U	0.134	0.013	25.3	3.8	07.11.96	8	U	0.108	0.025	48.3	8.1
50 389.58		B	0.209	0.008	39.4	1.7	50 395.62		B	0.220	0.015	51.9	2.5
		V	0.252	0.011	37.7	1.6			V	0.280	0.021	49.3	2.4
		R	0.324	0.008	41.6	1.0			R	0.337	0.015	51.1	1.3
		I	0.358	0.011	44.0	1.0			I	0.381	0.021	57.0	1.5
04.11.96	24	U	0.212	0.019	19.3	3.4	08.11.96	25	U	0.126	0.16	39.5	5.8
50 392.33		B	0.233	0.012	41.7	1.5	50 396.46		B	0.198	0.010	50.6	2.2
		V	0.264	0.015	44.4	1.9			V	0.236	0.014	48.6	2.0
		R	0.309	0.011	45.4	1.5			R	0.321	0.011	53.4	1.4
		I	0.339	0.015	48.0	1.4			I	0.325	0.014	57.1	1.8
04.11.96	32	U	0.073	0.014	22.4	6.3	09.11.96	52	U	0.092	0.018	36.0	8.9
50 392.41		B	0.220	0.009	45.4	1.7	50 397.37		B	0.181	0.011	59.2	3.2
		V	0.227	0.012	45.9	1.9			V	0.187	0.014	62.4	3.7
		R	0.336	0.009	47.1	1.3			R	0.282	0.011	59.8	2.4
		I	0.381	0.013	49.8	1.4			I	0.371	0.015	58.9	1.8
04.11.96	16	U	0.175	0.021	26.6	4.5	28.03.98	8	U	0.238	0.044	14.4	8.1
50 392.62		B	0.197	0.013	48.7	2.9	50 901.31		B	0.254	0.025	37.1	4.2
		V	0.247	0.018	47.0	2.2			V	0.358	0.031	48.4	3.0
		R	0.299	0.013	50.1	2.0			R	0.336	0.031	50.8	2.2
		I	0.376	0.018	48.7	1.8			I	0.372	0.029	37.7	3.4
05.11.96	23	U	0.195	0.016	35.9	3.4	30.03.98	14	U	0.337	0.030	34.7	7.7
50 393.50		B	0.186	0.010	47.0	1.9	50 903.27		B	0.288	0.017	35.1	3.8
		V	0.265	0.014	49.4	1.6			V	0.308	0.021	42.5	2.3
		R	0.327	0.011	50.9	1.3			R	0.297	0.016	43.3	2.3
		I	0.360	0.015	52.5	1.2			I	0.309	0.020	43.8	2.5
05.11.96	36	U	0.111	0.013	37.2	4.5	31.03.98	9	U	0.119	0.048	42.3	14.2
50 393.59		B	0.229	0.008	47.8	1.5	50 904.26		B	0.308	0.025	43.1	3.3
		V	0.281	0.011	49.0	1.5			V	0.245	0.030	44.2	6.1
		R	0.343	0.009	53.6	1.0			R	0.395	0.021	49.3	4.3
		I	0.396	0.012	53.4	1.0			I	0.531	0.028	51.4	3.2
06.11.96	12	U	0.233	0.037	48.7	4.9	01.04.98	8	U	0.100	0.033	30.4	14.2
50 394.32		B	0.244	0.022	49.1	3.6	50 905.25		B	0.277	0.020	41.3	3.4
		V	0.188	0.029	35.1	5.0			V	0.278	0.026	43.1	2.3
		R	0.334	0.022	55.5	2.2			R	0.343	0.019	52.2	2.2
		I	0.354	0.030	48.3	3.0			I	0.381	0.026	51.1	2.2

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