Polarimetric calibration

In this page we present polarimetric observations of standard stars used to calibrate our measurements. The observations have been done using the 0.60m Boller & Chivens or the 1.60m telescope at the Observatório do Pico do Dias (Laboratório Nacional de Astrofísica - LNA) using a CCD camara modified by the polarimetric modulus described in Magalhaes et al. (1996).

Polarized stars

Individual observations
Summary
Published polarization of standard stars
Correction by mission

Unpolarized stars

Individual observations
Average by star
Summary by mission

Observations with Glan filter

Individual observations
Summary

Polarized standard stars

Individual observations of polarized standard stars

Object	Date	Filter	P (%)	Error (%)	Position Angle	Error	signal/noise error	Retarder

HD23512	97/ago/31	V	2.069	0.100	75.0		0.056	l/2
	98/nov/24	V	2.233	0.036	170.5	0.46	0.037
	98/nov/25	V	2.225	0.015	170.8	0.19	0.033
	97/ago/29	R	2.892	0.187	160.5		0.022	l/4
	97/ago/30	R	2.901	0.208	160.9		0.021	l/4
	97/ago/31	R	2.172	0.096	75.5		0.041	l/2
	97/ago/30	I	2.291	0.144	157.1		0.021	l/4
	97/ago/31	I	2.005	0.069	86.1		0.021	l/2

HD43384	02out19	V	2.493	0.036	121.9		0.060
	02out20	V	3.119	0.090	133.9		0.036
	02out20	R	2.737	0.271	132.0		0.030
	02out20	I	1.454	0.211	110.6		0.046

HD80558	98/nov/24	V	3.174	0.039	123.9	0.35	0.019
	98/nov/25	V	3.232	0.052	123.7	0.46	0.032
	99/jan/18	V	3.236	0.027	129.2	0.24	0.027
	99/jan/21	V	3.193	0.034	129.6	0.31	0.029
	99/jan/22	V	3.193	0.039	128.8	0.35	0.028
	99/jan/23	V	3.226	0.029	129.4	0.26	0.027
	99/abr/08	V	3.273	0.028	124.2	0.25	0.023
	99/abr/11	V	3.332	0.042	124.2	0.36	0.028
	98/abr/19	R	3.231	0.057	122.7		0.021	l/2

HD110984


HD111613	99/jan/18	V	3.219	0.032	48.0	0.28	0.025
	99/jan/21	V	3.227	0.041	49.3	0.36	0.027
	99/jan/22	V	3.148	0.036	47.9	0.33	0.026
	99/jan/23	V	3.170	0.033	47.4	0.30	0.026
	99/abr/07	V	3.196	0.047	41.9	0.42	0.026
	99/abr/08	V	3.187	0.024	42.6	0.22	0.015
	99/abr/10	V	3.245	0.224	43.1	1.98	0.055
	99/abr/11	V	3.129	0.042	42.3	0.38	0.026
	98/abr/16	R	2.998	0.094	42.2		0.028	l/2
	98/abr/19	Neutro	2.744	0.061	36.9		0.033	l/2

HD126593	99/jul/30	B	4.428	0.167	37.4	1.08	0.041
	99/jul/27	V	4.906	0.194	41.8	1.13	0.024
	99/jul/28	V	4.935	0.032	44.4	0.19	0.023
	99/jul/29	V	4.923	0.148	43.4	0.86	0.021
	99/jul/31	V	4.896	0.259	43.4	1.52	0.028
	99/jul/29	R	4.711	0.176	39.3	1.07	0.032
	99/jul/30	R	4.632	0.191	39.2	1.18	0.031
	99/jul/31	R	4.735	0.271	38.2	1.64	0.040
	03/abrl/26	R	4.846	0.040	76.8		0.037	l/2
	03/abr/22	R	5.037	0.175	120.7		0.036	l/4
	99/jul/29	I	3.464	0.202	32.4	1.67	0.020
	99/jul/31	I	3.360	0.133	30.5	1.13	0.026

HD155197	99/jul/30	B	4.133	0.163	67.5	1.13	0.049
	97/ago/30	V	4.287	0.152	50.1		0.028	l/4
	97/ago/31	V	4.403	0.043	150.4		0.036	l/2
	99/jul/27	V	4.245	0.157	72.8	1.06	0.029
	99/jul/28	V	4.444	0.169	72.7	1.09	0.026
	99/jul/29	V	4.453	0.276	71.6	1.78	0.035
	99/jul/31	V	4.361	0.175	72.6	1.15	0.030
	97/ago/29	R	4.352	0.294	46.3		0.022	l/4
	97/ago/30	R	4.418	0.291	44.7		0.022	l/4
	97/ago/31	R	4.270	0.040	153.2		0.027	l/2
	99/jul/29	R	3.926	0.292	72.6	2.13	0.052
	99/jul/30	R	4.165	0.184	68.9	1.27	0.040
	99/jul/31	R	4.512	0.162	69.6	1.03	0.037
	03/abr/26	R	4.271	0.047	106.1		0.047	l/2
	03/abr/22	R	4.495	0.086	149.5		0.031	l/4
	03/abr/23	R	4.516	0.104	148.0		0.053	l/4
	03/ago/27	R	4.492	0.064	59.5		0.047	l/4
	04/oct/06	R	4.303	0.075	53.4		0.052	l/4
	04oct07	R	4.272	0.081	51.8		0.041	l/4
	04oct08	R	4.405	0.070	53.5		0.073	l/4
	97/ago/31	I	3.761	0.065	161.8		0.029	l/2
	99/jul/29	I	3.705	0.131	60.6	1.01	0.030	l/2
	99/jul/31	I	3.489	0.155	60.7	1.27	0.033	l/2
	04oct09	I	3.790	0.152	54.0		0.078	l/4

HD161056	99/abr/07	V	4.024	0.053	30.4	0.38	0.030
	99/abr/10	V	4.086	0.030	29.6	0.21	0.028
	98/abr/19	R	4.024	0.083	31.0		0.029	l/2
	03set26	R	3.715	0.160	112.7		0.057	l/4
	03set28	I	3.014	0.300	111.9		0.046	l/4

HD187929	02out18	B	1.600	0.025	53.4		0.035

HD251204	03set24	R	4.630	0.123	16.1		0.049	l/4
	04oct08	R	4.322	0.172	105.7		0.156	l/4

HD298383	03abr26	R	5.199	0.056	150.9		0.046	l/2
	03abr23	R	5.742	0.082	12.3		.026	l/4
	03abr24	R	5.825	0.119	10.8		.053	l/4
	03abr25	R	5.888	0.101	12.1		.034	l/4

BD+25 727	03set24	B	5.019	0.254	73.4		0.050	l/4
	03set24	V	6.443	0.065	74.4		0.041	l/4
	04oct07	V	6.658	0.147	165.4		0.070	l/4
	03set24	R	6.348	0.051	73.0		0.044	l/4
	03set25	R	6.428	0.060	73.4		0.049	l/4
	04oct07	R	6.404	0.046	163.9		0.050	l/4
	04oct08	R	6.386	0.060	163.5		0.110	l/4
	03set24	I	5.214	0.078	70.0		0.035	l/4
	04oct09	I	5.510	0.238	161.6		0.115	l/4

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Mission average of polarized standard stars

Star	Date	Filter	P(%)	Error	Position Angle	Erro	Retarder	# of Obs.
HD23512	97ago	V	2.069	0.100	75.		l/2	1
	98/nov	V	2.226	0.014	170.8	0.18
	97ago	R	2.172	0.096	75.5		l/2	1
	97ago	R	2.896	0.139	160.7		l/4	2
	97ago	I	2.005	0.069	86.1		l/2	1
	97ago	I	2.291	0.144	157.1		l/4	1

HD43384	02/out	V	2.548	0.033	123.9
	02/out	R	2.737	0.271	132.0
	02/out	I	1.454	0.211	110.6

HD80558	98/nov	V	3.195	0.031	123.8	0.28
	99/jan	V	3.217	0.016	129.3	0.14
	99/abr	V	3.291	0.023	124.2	0.20
	98/abr	R	3.231	0.057	122.7

HD110984	05/fev_a	R	5.569	0.033	39.5		l/2*	n
	05/fev/17	R	5.604	0.063	47.2		l/2*	n
	05/fev_a	I	4.951	0.046	30.4		l/2*	n

HD111613	99/jan	V	3.189	0.018	48.0	0.16
	99/abr	V	3.177	0.019	42.4	0.17
	98/abr	R	2.998	0.094	42.2
	98/abr	Neutro	2.744	0.061	36.9

HD126593	99jul	B	4.428	0.167	37.4	1.08	l/2
	99jul	V	4.933	0.031	44.3	0.18	l/2
	99jul	R	4.685	0.117	39.1	0.71	l/2
	03abr	R	4.846	0.040	76.8	0.037	l/2
	03abr	R	5.037	0.175	120.7	0.036	l/4
	05/fev_a	R	4.804	0.030	22.9		l/2*
	99jul	I	3.390	0.111	31.1	0.94	l/2
	05/fev_a	I	4.148	0.04	13.4		l/2*

HD155197	99jul	B	4.133	0.163	67.5	1.13	l/2
	97ago	V	4.287	0.152	50.1		l/4	1
	97ago	V	4.403	0.043	150.4		l/2	1
	99jul	V	4.356	0.091	72.6	0.60	l/2
	97ago	R	4.270	0.040	153.2		l/2	1
	99jul	R	4.293	0.112	69.8	0.75	l/2
	03abr	R	4.271	0.047	106.1	0.047	l/2
	97ago	R	4.384	0.207	45.5		l/4	2
	03abr	R	4.502	0.066	148.9		l/4
	03ago	R	4.492	0.064	59.5		l/4
	04oct	R	4.332	0.043	53.0		l/4	3
	04oct	R	3.790	0.152	54.0		l/4	1
	07mai	R	4.332	0.041	22.0		l/2*
	97ago	I	3.761	0.065	161.8		l/2	1
	99jul	I	3.615	0.100	60.6	0.79	l/2

HD161056	99/abr	V	4.071	0.026	29.8	0.18
	98/abr	R	4.024	0.083	31.0
	03/set	R	3.715	0.160	112.7	0.057	l/4
	03set	I	3.014	0.300	111.9	0.046	l/4

HD187929	02/out	B	1.600	0.025	53.4

HD251204	03set	R	4.630	0.123	16.1		l/4
	04oct	R	4.322	0.172	105.7		l/4	1

HD298383	03abr	R	5.199	0.056	150.9		l/2
		R	5.804	0.056	11.9		l/4
	05/fev_a	R	5.203	0.024	96.6		l/2*	n
	05/fev/17	R	5.089	0.077	104.6		l/2*	n

BD+25 727	03set	B	5.02	0.25	73.4		l/4
	03set	V	6.443	0.065	74.4		l/4
	04oct	V	6.658	0.147	165.4		l/4	1
	03set	R	6.381	0.039	73.2		l/4
	04oct	R	6.397	0.037	163.8		l/4	2
	03set	I	5.214	0.078	70.0		l/4
	04oct	I	5.510	0.238	161.6		l/4	1

* we have used the new polarimetric modulus. The polarization angle measured must be multiplied by -1.

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Polarization values of the polarized standard stars listed in the literature

Star	Ref.	Filter	P(%)	Error (%)	Position Angle

HD23512	1	V	2.260	0.010	29.9
	3	non-std	2.094	0.013	30.5
	1	R	2.29	0.02	29.6
	1	0.75	2.13	0.03	29.3

HD43384	1	U	2.58	0.04	169.8
	1	B	2.83	0.05	169.3
	1	V	2.94	0.04	169.8
	5	?			172
	6	?			170
	1	R	2.86	0.03	170.7
	1	I	2.71	0.04	170.3

HD80558	2	V			162.0
	3	non-std	3.111	0.008	162.1

HD110984	?	?			91.6

HD111613	2	V			81.0
	3	non-std	3.057	0.008	80.2

HD126593	4	V	5.020	0.012	75.2

HD155197	4	V	4.380	0.030	103.2

HD161056	2	V			69.0
	3	non-std			68.2
	4	V	4.035	0.038	67.0

HD187929	1	U	1.43	0.03	95.4
	7	U	1.33	0.06	90
	1	B	1.65	0.02	94.4
	7	B	1.60	0.08	91
	aver	B	1.646	0.019	94.2
	7	V	1.71	0.06	92

	1	R	1.67	0.02	93.3
	7	R	1.62	0.05	91
	1	I	1.63	0.01	92.6
	7	I	1.50	0.04	90
	5	?			95
	6	?			93
	3	non-std	1.76	0.03	93.8

HD251204	4	V	4.04	0.066	147

HD298383	4	V	5.23	0.009	148.6

BD-12 5133	8	?	4.02	0.02	146.97

BD+25 727	4	V	4.27	0.012	33.8

1, Hsu & Breger 1982
2, Serkowski, Mathewson & Ford, 1975
3, Bastien et al. 1988
4, Turnshek et al. 1990
5, Dolan & Tapia, 1986, PASP, 98, 792
6, Serkowski, 1974a
7, Bailey & Hough, 1982
8, Fossati et al. 2007

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Correction to equatorial systems

Mission	Filter	Star					Retarder
			Observed	Literature	Difference
Ago/97	V	HD23512	75.0	29.9	-45.1		l/2
		HD155197	150.4	103.2	-47.2		l/2
		Average			-46.15		l/2
	R	HD23512	75.5	29.6	-45.9		l/2
		HD155197	153.2	103.2	-50.		l/2
		Average			-47.95		l/2
	I	HD23512	86.1	29.3	-56.8
		HD155197	161.8	103.2	-58.6		l/2
		Average			-57.7		l/2

	V	HD155197	50.1	103.2	+53.1		l/4
	R	HD23512	160.7	29.6	+48.9		l/4
		HD155197	45.5	103.2	+57.7		l/4
		Average			+53.3		l/4
	I	HD23512	157.1	29.3	+52.2		l/4

Abr/98	R	HD80558	122.7	162.0	39.3
		HD111613	42.2	81	38.8
		HD161056	31.0	68	37.0
	R	Average			38.4
	Neutro	HD111613	36.9	81	44.1

Nov/98	V	HD23512	170.80	29.900	39.100
		HD80558	123.80	162.000	38.200
		Average			38.650	0.6

Jan/99	V	HD80558	129.30	162.000	32.700
		HD111613	48.00	81.000	33.000
		Average			32.850	0.2

Abr/99	V	HD80558	124.20	162.000	37.800
		HD111613	42.40	81.000	38.600
		HD161056	29.80	68.000	38.200
		Average			38.200	0.4

Jul/99	V	HD126593	44.30	75.200	30.900		l/2
		HD155197	72.60	103.200	30.600		l/2
		Average			30.750	0.2

Abri/03	R	HD126593	76.8	75.2	-1.6		l/2
		HD155197	106.1	103.2	-2.9
		HD298383	150.9	148.6	-2.3
		Average			-2.27	0.65

Abril/03	R	HD126593	120.7	75.2	-45.5		l/4
		HD155197	148.9	103.2	-45.7
		HD298383	11.9	148.6	-43.3
		Average			-44.8

Ago/03	R	HD155197	59.5	103.2	+43.7		l/4

Set/03	R	BD+25 727	73.2	33.8	-39.4		l/4
		HD251204	16.1	147	-49.1
		HD161056	112/7	68	-44.7
		Average			-44.4		l/4

	I	BD+25 727	70.0	33.8	-36.2		l/4
		HD161056	111.9	68	-43.9		l/4
		Average			-40.1

Oct/04	V	BD+25 727	165.4	33.8	+48.4		l/4

	R	BD+25 727	163.8	33.8	+50		l/4
	R	HD155197	53.0	103.2	+50.2		l/4
	R	HD251204	105.7	147	+41.3		l/4
		Average			+47.17

	I	BD+25 727	161.6	33.8	+52.2		l/4
	I	HD155197	54.0	103.2	+49.2		l/4
		Average			+50.7

05/fev_a	R	HD110984	39.5	91.6	52.1		l/2
	R	HD126593	22.9	75.2	52.3		l/2
	R	HD129383	96.6	148.6	52.0		l/2
				Average	52.13

05/fev/17	I	HD110984	30.4	91.6	61.2		l/2
	I	HD126593	13.4	75.2	61.8		l/2
				Average	61.5

05/fev/17	R	HD110984	47.2	91.6	44.4		l/2
	R	HD129383	104.6	148.6	44.0		l/2
				Average	44.2

07/mai	R	HD155197	-22.0	103.2	125.2		l/2*
		BD-12-5133	-158.3	146.97	125.27		l/2*
				Average	125.23		l/2*

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Position Angle Rotation considering objects observed in more than one filter

Mission	Filters	Object	Object	Object	Average		Retarder
		HD23512	HD155197
97/Ago	R-V	-0.8	-2.8		-1.8		l/2
	I-V	-11.7	-11.4		-11.55		l/2

97/Ago	R-V	-	+4.6		+4.6		l/4
	I-R	-1.12	-		-1.12		l/4

		glan	HD126593	HD155197	Average	Std.Dev.	l/2
Jul/99	B-V	--	6.900	5.100	6.0	1.27	l/2
	R-V	3.30	5.200	2.800	3.8	1.27	l2
	I-V	11.80	13.200	12.000	12.3	0.76	l2

		BD+25 727					l/4
24/Set/03	B-V	-1.0
	R-V	-1.4
	I-V	-4.4

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Average correction to equatorial system

	B	V	R	I	Retarder
97/Ago	-	-46.15	-47.95	-57.7	l/2
97/Ago	-	+53.1	+53.3	+52.2	l/4
Nov/98	-	38.65	-	-
Jan/99	-	32.85	-	-
Abr/99	-	38.20	-	-
Jul/99	36.75	30.75	34.550	43.050	l/2
Out/02	40.2	45.9	38.7	59.7
24/set/03	-39.6	-40.6	-44.4	-40.1	l/4
Oct/2005		+48.4	+47.17	+50.7
Feb_a/05	-	-	+52.13	+61.5	l/2
17/Feb/05	-	-	+44.2	-	l/2
May/07	-	-	+125.23	-	l/2*

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Unpolarized stars

Individual observations of unpolarized stars

Star	Date	Filter	P (%)	Erro	Position Angle	Error	Signal/noise error	Retarder
HD12021	99/jul/30	B	0.178	0.036	103.1	5.79	0.035
	98/nov/25	V	0.271	0.059	94.6	6.24	0.066
	99/jul/27	V	0.072	0.110	84.7	43.77	0.023
	99/jul/28	V	0.444	0.226	63.0	14.58	0.017
	99/jul/29	V	0.124	0.060	92.6	13.86	0.023
	99/jul/31	V	0.156	0.025	112.7	4.59	0.023
	99/jul/29	R	0.216	0.037	111.0	4.91	0.040
	99/jul/30	R	0.160	0.022	117.1	3.94	0.046
	03set27	R	0.600	0.564	86.3*		0.067	l/4
	99/jul/29	I	0.261	0.104	89.2	11.42	0.048
	99/jul/31	I	0.192	0.092	125.8	13.73	0.048
	03set27	I	0.264	0.044	146.3*		0.049	l/4
	04oct09	I	0.453	0.094	138.3*		0.147	l/4

HD14069	03/set/24	B	0.606	0.133	52*		0.042	l/4
	98/nov/25	V	0.137	0.056	82.3	11.71	0.037
	02/out/19	V	0.295	0.342	128.0		0.107
	02/out/20	V	0.288	0.202	97.8		0.055
	03/set/24	V	0.231	0.047	148.1		0.046	l/4
	04oct07	V	0.156	0.077	58.3*		0.075	l/4
	02/out/20	R	0.117	0.037	74.2		0.050
	03/set/24	R	0.393	0.130	131.8*		0.040	l/4
	03/set/25	R	0.052	0.079	71.9*		0.042	l/4
	04oct08	R	0.343	0.119	48.27*		0.103	l/3
	02/out/20	I	0.228	0.063	87.5		0.081
	03/set/24	I	0.601	0.168	132.3*		0.039	l/4

HD 20630	02/out/20	B	0.102	0.019	16.0		0.043

HD94851	03/abr/26	R	0.083	0.036	71.5		0.047	l/2
	03/abr/23	R	0.319	0.062	87.5		0.031	l/4
	03/abr/24	R	0.240	0.074	164.0		0.053	l/4
	03/abr/25	R	0.355	0.110	175.0		0.038	l/4

HD98161	99/abr/08	V	0.041	0.042	99.1	29.35	0.028
	99/abr/11	V	0.014	0.035	75.3	71.62	0.027
	98/abr/19	R	0.024	0.11	84.6	123.
	98/abr/19	N	0.056	0.025	67.7	111.8

HD154892	99/jul/27	V	0.062	0.113	48.7	52.21	0.018
	99/jul/28	V	0.041	0.016	126.0	11.18	0.014

	03/abr/22	R	0.354	0.075	.5		0.026	l/4

	03/ago/27	R	0.715	0.195	139.6*		0.034	l/4

HD176425	99/abr/07	V	0.103	0.044	86.6	12.24	0.032

	03set26	R	0.445	0.469	58.7*		0.085	l/4

	03set26	I	0.742	0.260	110.2*		0.043	l/4

BD +23	04oct08	R	0.178	0.054	57.27*		0.074	l/4

BD +32 3739	03/abr/26	R	0.054	0.038	24.5		0.050	l/2
	03/abr/23	R	0.550	0.120	3.2		0.031	l/4
	03set28	R	0.433	0.113	50.3*		0.071	l/4
	04/oct/06	R	0.190	0.047	64.47*		0.053	l/4
	04oct07	R	0.049	0.065	139.97*		0.075	l/4

	03set28	I	0.721	0.126	46.6*		0.061	l/4

* in the equatorial system

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Mission average of unpolarized standard stars

Star	DAte	Filter	P (%)	Error	Position Angle	Error	Retarder

HD12021	99/jul	B	0.178	0.036	103.1	5.79	l/2
	98/nov	V	0.271	0.059	94.6	6.24	l/2
	99/jul	V	0.142	0.023	109.0	4.56	l/2
	99/jul	R	0.174	0.019	115.1	3.12	l/2
	03/set	R	0.600	0.564	86.3*		l/4
	99/jul	I	0.179	0.069	106.8	11.06	l/2
	03/set	I	0.264	0.044	146.3*		l/4

HD14069	03/set	B	0.606	0.133	52*		l/4
	98/nov	V	0.137	0.056	82.3	11.71	l/2
	02/nov	V	0.260	0.174	105.2		l/2
	03/set	V	0.231	0.047	148.1*		l/4
	02/nov	R	0.117	0.037	74.2		l/2
	03/set	R	0.093	0.068	121.4		l/4
	02/nov	I	0.228	0.063	87.5		l/2
	03/set	I	0.601	0.168	132.3*		l/4

HD20630	02/nov	B	0.102	0.019	0.043

HD94851	03abr	R	0.083	0.036	71.5		l/2
	03abr	R	0.051	0.044	115.9		l/4

HD98161	99/abr	V	0.023	0.027	91.5	33.22
	98/abr	R	0.024	0.11	123.
	98/abr	N	0.056	0.025	111.8

HD154892	99/jul	V	0.039	0.016	125.6	11.58	l/2
	03abr	R	0.354	0.075	0.5		l/4
	03ago	R	0.715	0.195	139.6*		l/4

HD176425	99/abr	V	0.103	0.044	86.6	12.24	l/2
	03/set	R	0.445	0.469	58.7*		l/4
	03/set	I	0.742	0.260	110.2*		l/4

BD +32 3739	03abr	R	0.054	0.038	24.5		l/2
	03abr	R	0.550	0.120	3.2		l/4
	03set	R	0.433	0.113	50.3*		l/4
	03set	I	0.721	0.126	46.6*		l/4

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Instrumental polarization by mission estimated by the average of all unpolarized standard stars observed

Mission	Filter	P (%)	Error	Position angle	Position angle in equatorial system	Retarder	# Observ.
abr/98	R	0.024	0.11		123.	l/2	1
	N	0.056	0.025		111.8	l/2	1

Nov/98	V	0.20	0.041	90.200

Jan/99	V	-	-	-

Abr/99	V	0.04	0.023	88.400

Jul/99	B	0.18	0.036	103.100
	V	0.07	0.013	114.900
	R	0.17	0.019	115.100
	I	0.18	0.069	106.800

Out/02	B	0.102	0.019	16.0	56.8
	V	0.260	0.174	105.2	151.1
	R	0.117	0.037	74.2	112.9
	I	0.228	0.063	87.5	147.2

Abr/03	R	0.049	0.026	55.9	11.1	l/2
	R	0.113	0.036	174.9	130.1	l/4

Ago/03	R	0.715	0.195	139.6*		l/4	1

Set/03	B	0.606	0.133	52*		l/4	1
	V	0.231	0.047	148.1*		l/4	1
	R	0.082	0.057	68.4*		l/4	5
	I	0.184	0.040	145.0*		l/4	4

Oct/04	V	0.156	0.077	58.3*		l/4	1
	R	0.142	0.030	60.3*		l/4	4
	I	0.453	0.094	138.3*		l/4	1

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Observations with the Glan filter

Individual observations with Glan filter

Star	Date	Filter	P (%)	Error	Position angle	Error	Signal/Noise Error	Retarder

HD12021	99/jul/28	V	98.974	4.713	59.6	1.36	0.053	l/2
	99/jul/29	V	101.100	2.942	60.5	0.83	0.034	l/2

	99/jul/29	R	99.391	3.441	57.0	0.99	0.049	l/2

	99/jul/29	I	97.852	2.991	48.5	0.88	0.059	l/2
	04oct09	I	101..64	2.19	1.5*		0.179	l/4

HD80558	99/abr/11	V	99.780	7.056	52.6	2.03	0.034	l/2

HD154892	99/jul/27	V	99.424	3.224	60.2	0.93	0.020	l/2
	99/jul/28	V	100.772	2.886	60.4	0.82	0.046

HD161056	99/abr/10	V	99.651	0.460	52.6	0.13	0.148	l/2

HD251204	03/set/24	R	89.8	1.8	177.9*		0.144	l/4

BD+32	04oct06

* in the equatorial system

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Mission average – Glan filter

Mission	Filter	P (%)	Error	Position Angle	Error	Retarder	# of Obs.

99/abr	V	99.651	0.459	52.6	0.13	l/2

99/jul	V	100.309	1.629	60.3	0.47	l/2
99/jul	R	99.391	3.441	57.0	0.99	l/2
99/jul	I	97.852	2.991	48.5	0.88	l/2

03/set	R	89.8	1.8	177.9*		l/4

04/Oct	V	93.779	0.608	0.7*		l/4	1
	R	98.727	0.352	178.9*		l/4	3
	I	101.64	2.2	1.5*		l/4	1

* in the equatorial system

[TOP]

Updated: December/2006

Claudia V. Rodrigues