Unpolarized Standard Stars

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Unpolarized Standard Stars
A List of Polarized and Unpolarized Standard Stars for UKIRT

Below we list standards that may be useful for calibrating polarimetry observations at UKIRT. Some southern standards are also available from ESO.

Unpolarized Standard Stars
"Serkowski" Polarized Standards
Polarized Standards from Whittet et al. (1992)

Unpolarized Standard Stars

The stars in this table are taken from "Planets, Stars & Nebulae studied with Photopolarimetry", 1974, T. Gehrels (ed.), University of Arizona Press, Tuscon, pp. 168-169. Most unpolarized stars have large proper motions. If the stars in this list are not appropriate then it is possible to look at other catalogues (e.g. Bright Star catalogue) for other stars with large proper motions. NOTE: Many of these sources are too bright for use with UFTI.

Star	m_V	Spectral Type	R.A. (1950)	Dec. (1950)	Proper motion
HD 432	2.4	F2 IV	00 06 29.7	+58 52 27	+0.0679	-0.177
HD 9540	7.0	G8 V	01 30 52.9	-24 25 55	+0.0215	-0.152
HD 10476	5.2	K1 V	01 39 46.6	+20 01 34	-0.0209	-0.668
HD 18803	6.7	G6 V	02 59 27.7	+26 24 56	+0.0176	-0.161
HD 20630	4.8	G5 V	03 16 44.1	+03 11 17	+0.0178	+0.098
HD 38393	3.6	F6 V	05 42 22.6	-22 27 48	-0.0212	-0.373
HD 39587	4.4	G0 V	05 51 25.2	+20 16 07	-0.0133	-0.086
HD 42807	6.5	G6 V	06 10 26.0	+10 38 44	+0.0062	-0.285
HD 61421	0.3	F5 IV	07 36 41.1	+05 21 17	-0.0473	-1.029
HD 65583	7.0	G8 V	07 57 26.5	+29 21 59	-0.0114	-1.167
HD 90508	6.5	G1 V	10 24 59.1	+49 13 09	-0.0004	-0.010
HD 98281	7.3	G8 V	11 15 49.2	-04 47 37	+0.0528	-0.150
HD 100623	6.0	K0 V	11 32 03.4	-32 33 59	-0.0536	+0.821
HD 102438	6.5	G5 V	11 44 45.4	-30 00 20	-0.0214	-0.245
HD 102870	3.6	F8 V	11 48 05.4	+02 02 48	+0.0494	-0.275
HD 103095	6.5	G8 VI	11 50 06.2	+38 04 39	+0.3387	-5.806
HD 114710	4.3	G0 V	13 09 32.4	+28 07 52	-0.0605	+0.879
HD 115617	4.8	G6 V	13 15 47.1	-18 02 01	-0.0754	-1.072
HD 125184	6.5	G8 V	14 15 21.1	-07 18 32	+0.0168	-0.245
HD 142373	4.6	F9 V	15 50 56.7	+42 35 26	+0.0396	+0.628
HD 144287	7.1	G8 V	16 01 59.5	+25 22 52	-0.0389	+0.672
HD 144579	6.7	G8 V	16 03 13.2	+39 17 26	-0.0493	+0.055
HD 154345	6.8	G8 V	17 01 11.6	+47 08 23	+0.0117	+0.846
HD 165908	5.0	F7 V	18 05 07.5	+30 33 13	-0.0075	+0.071
HD 185395	4.5	F4 V	19 35 06.0	+50 06 16	-0.0025	0.256
HD 188512	3.7	G8 IV	19 52 51.4	+06 16 36	+0.0029	-0.479
HD 202573	7.0	G5 V	21 13 44.5	+25 13 31	-0.0046	-0.032
HD 202940	6.6	G5 V	21 16 52.5	-26 33 36	-0.0402	-0.352
HD 210027	3.8	F5 V	22 04 40.8	+25 06 01	+0.0220	+0.028
HD 216956	1.2	A3 V	22 54 53.5	-29 53 16	+0.0258	-0.161

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"Serkowski" Polarized Standards

Polarized standards are polarized by dichroic absorption in the interstellar (or intracloud) medium. The following "Serkowski" polarized standards are taken from "Planets, Stars & Nebulae studied with Photopolarimetry", 1974, T. Gehrels (ed.), University of Arizona Press, Tuscon, p. 170. They are based on fitting the Serkowski Interstellar Polarization Law :

The maximum polarization, P_max, occurs at the wavelength l_max.

Star	R.A. (1950)	Dec. (1950)	P_max (%)	l_max (�m)	P.A (degrees)	m_V
HD 7927	01 16 55.1	+57 58 10	3.4	0.51	94	5.0
HD 14433	02 18 22.3	+57 00 54	3.9	0.51	112	6.4
HD 21291	03 25 00.1	+59 46 05	3.5	0.52	115	4.2
HD 23512	03 43 36.3	+23 28 12	2.3	0.60	30	8.1
HD 43384	06 13 55.6	+23 45 35	3.0	0.53	170	6.2
HD 147084	16 17 37.4	-24 03 02	4.3	0.67	32	4.6
HD 154445	17 02 57.5	-00 49 30	3.7	0.57	90	5.7
HD 160529	17 38 41.2	-33 28 47	7.2	0.53	20	6.7
HD 183143	19 25 13.2	+18 11 37	6.1	0.56	0	6.9
HD 187929	19 49 55.5	+00 52 33	1.8	0.56	93	3.5-4.3
HD 198478	20 47 14.0	+45 55 40	2.8	0.53	3	4.9
HD 204827	21 27 31.3	+58 31 13	5.6	0.46	60	7.9

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Polarized Stars from Whittet et al. (1992)

Polarization observations in the UBVRIJHK bands were made with the Hatfield polarimeter (HATPOL) by Whittet et al. 1992, ApJ, 386, 562. The results from this study, for stars reachable from UKIRT, are shown here. Only the IJHK polarizations are given here.

Note: the K-band polarization observations were made in a non-standard K passband centred at 2.04 microns. Values appropriate to a more standard K-band filter have been calculated by Gerakines et al. (1995, ApJ, 455, L171) from power-law extrapolations of the Whittet et al. multi-colour polarisation measurements.

Star (2MASS mags)	R.A (1950)	Dec. (1950)	m_V	Spectral Type	Band	P (%)	P.A (degrees)
NGC 1333 #3 (J=9.4,K=7.1)	03 26 04.8	+31 11 33	-	-	I	2.84 � 0.05	111 � 1
					J	2.40 � 0.07	111 � 1
					H	1.65 � 0.05	112 � 5
					K	1.4 � 0.4	93 � 8
NGC 1333 #5 bad coords?	03 26 15.1	+31 08 03	-	-	I	7.93 � 0.15	135 � 1
					J	6.81 � 0.02	142 � 1
					H	5.02 � 0.03	145 � 1
					K	3.41 � 0.04	149 � 1
Taurus, Elias 1 (J=8.7,K=5.8) double?	04 15 34.6	+28 12 01	-	A5e	I	5.31 � 0.07	3 � 1
					J	4.30 � 0.04	1 � 1
					H	2.93 � 0.05	177 � 1
					K	2.16 � 0.13	176 � 2
Taurus, Elias 3 (J=8.3,K=5.8)	04 20 22.6	+24 53 13	-	K2 III	I	2.29 � 0.05	103 � 1
					J	1.79 � 0.03	109 � 1
					H	1.14 � 0.04	109 � 2
					K	0.76 � 0.06	113 � 2
Taurus, Elias 9 (J=7.6,K=5.5)	04 29 09.6	+24 27 17	-	M4 III	I	0.38 � 0.08	1 � 4
					J	0.44 � 0.02	145 � 3
					H	0.41 � 0.02	143 � 1
					K	0.22 � 0.02	146 � 5
Taurus, Elias 19 (J=7.6,K=5.5)	04 41 14.3	+25 19 20	-	M4 III	I	5.22 � 0.06	36 � 1
					J	3.06 � 0.05	36 � 1
					H	1.94 � 0.03	35 � 1
					K	1.36 � 0.03	38 � 1
Taurus, Elias 29 (J=8.2,K=6.8)	04 34 12.0	+25 11 30	-	G9 III	I	4.01 � 0.07	31 � 1
					J	2.43 � 0.02	29 � 1
					H	1.57 � 0.02	27 � 1
					K	1.07 � 0.10	34 � 4
HD 28170	04 24 31.7	+24 57 03	8.95	A5 V	I	1.65 � 0.03	89 � 1
					J	1.03 � 0.02	89 � 1
					H	0.59 � 0.02	90 � 1
					K	0.49 � 0.12	87 � 10
HD 28975	04 31 48.5	+24 08 30	9.02	A3	I	2.75 � 0.04	57 � 1
					J	1.77 � 0.05	60 � 1
					H	1.03 � 0.06	62 � 2
					K	0.87 � 0.12	39 � 6
HD 29333	04 35 17.1	+29 17 18	8.5	A2	I	4.75 � 0.09	71 � 1
					J	2.88 � 0.03	69 � 1
					H	1.81 � 0.04	68 � 1
					K	1.19 � 0.08	73 � 3
HD 29647	04 38 03.7	+25 53 51	8.37	B6-7 IV	I	2.33 � 0.06	74 � 1
					J	1.70 � 0.02	78 � 1
					H	1.08 � 0.02	77 � 1
					K	0.73 � 0.06	80 � 2
HD 29835	04 40 00.4	+26 09 00	8.70	K2 III	I	3.45 � 0.06	25 � 1
					J	1.82 � 0.05	23 � 1
					H	1.12 � 0.06	20 � 3
					K	0.87 � 0.07	14 � 8
HD 30168	04 43 07.5	+25 56 46	7.70	B8 V	I	3.40 � 0.06	23 � 1
					J	2.17 � 0.05	25 � 1
					H	1.42 � 0.02	24 � 1
					K	0.74 � 0.08	28 � 6
HD 30675	04 47 44.0	+28 13 47	7.6	B3	I	3.32 � 0.09	58 � 1
					J	1.90 � 0.09	58 � 1
					H	1.10 � 0.08	61 � 4
					K	0.74 � 0.12	62 � 7
HDE 279652	04 14 50.2	+37 35 54	9.82	A2 V	I	1.03 � 0.05	86 � 1
					J	0.61 � 0.03	91 � 2
					H	0.45 � 0.04	93 � 3
					K	-	-
HDE 279658	04 13 47.3	+37 09 32	9.91	B7 V	I	2.43 � 0.09	144 � 1
					J	1.42 � 0.03	147 � 1
					H	0.86 � 0.04	146 � 1
					K	-	-
HDE 283637	04 22 53.3	+27 30 18	11.27	B9	I	2.50 � 0.07	8 � 1
					J	1.57 � 0.05	6 � 1
					H	1.12 � 0.06	6 � 6
					K	-	-
HDE 283701	04 31 49.3	+27 06 03	9.66	A0 V	I	3.04 � 0.07	33 � 1
					J	1.68 � 0.12	42 � 5
					H	1.36 � 0.09	35 � 3
					K	0.86 � 0.08	23 � 8
HDE 283725	04 35 58.9	+28 44 38	10.8	F5	I	4.16 � 0.07	65 � 1
					J	2.50 � 0.03	66 � 1
					H	1.60 � 0.03	65 � 1
					K	1.23 � 0.09	69 � 5
HDE 283800	04 40 21.4	+26 56 03	9.78	B5 V	I	3.58 � 0.07	27 � 1
					J	1.94 � 0.08	27 � 1
					H	1.36 � 0.06	29 � 2
					K	-	-
HDE 283809 (J=7.0,K=6.2)	04 38 20.6	+25 49 05	10.78	B3 V	I	6.27 � 0.03	52 � 1
					J	3.81 � 0.07	57 � 1
					H	2.59 � 0.07	58 � 1
					K	1.71 � 0.11	55 � 3
HDE 283812	04 41 21.0	+25 26 13	9.54	A2 V	I	5.68 � 0.07	31 � 1
					J	3.21 � 0.06	32 � 1
					H	2.09 � 0.04	31 � 1
					K	1.31 � 0.07	35 � 2
HDE 283855	04 45 06.5	+26 56 32	11.4	A2	I	4.37 � 0.08	46 � 1
					J	2.58 � 0.03	46 � 1
					H	1.67 � 0.06	47 � 3
					K	-	-
HD 38563A	05 44 09.5	+00 03 33	10.42	B3-5	I	4.22 � 0.03	99 � 1
					J	2.58 � 0.05	100 � 2
					H	1.57 � 0.05	97 � 1
					K	0.61 � 0.06	93 � 5
HD 38563B	05 44 10.9	+00 04 17	10.56	B2 II-III	I	2.57 � 0.07	8 � 1
					J	1.85 � 0.05	11 � 1
					H	1.20 � 0.08	15 � 2
					K	0.59 � 0.16	12 � 9
HD 38563C	05 44 11.5	+00 01 38	13.09	A0 II	I	8.96 � 0.26	72 � 1
					J	6.03 � 0.10	71 � 1
					H	3.68 � 0.10	70 � 1
					K	2.21 � 0.55	78 � 17
CMa R1 #24	07 02 26.2	-10 51 41	13.31	A0 V	I	3.24 � 0.10	89 � 1
					J	2.10 � 0.05	86 � 1
					H	1.43 � 0.10	88 � 3
					K	-	-
r-Oph, Elias 14	16 23 01.7	-24 16 50	-	-	I	6.67 � 0.07	2 � 1
					J	4.95 � 0.02	2 � 1
					H	3.24 � 0.03	3 � 1
					K	1.95 � 0.03	3 � 1
r-Oph, Elias 22	16 23 22.0	-24 14 15	-	-	I	5.25 � 0.07	178 � 1
					J	3.79 � 0.02	176 � 1
					H	2.21 � 0.03	177 � 1
					K	0.99 � 0.05	1 � 2
r-Oph, Elias 25	16 23 32.8	-24 16 44	17.01	B3 V	I	8.96 � 0.09	23 � 1
					J	6.46 � 0.02	24 � 1
					H	4.13 � 0.02	24 � 1
					K	-	-
HD 147283	16 18 56.4	-24 22 40	10.27	A3 V	I	1.62 � 0.07	174 � 1
					J	1.17 � 0.03	173 � 1
					H	0.91 � 0.05	172 � 2
					K	0.48 � 0.04	171 � 7
HD 147343	16 19 18.8	-24 14 47	9.36	A1 V	I	0.24 � 0.08	140 � 7
					J	0.22 � 0.03	128 � 4
					H	0.45 � 0.06	87 � 4
					K	0.33 � 0.10	137 � 7
HD 147648	16 21 00.3	-25 17 59	9.42	B8 V	I	0.75 � 0.04	41 � 1
					J	0.36 � 0.03	43 � 3
					H	0.32 � 0.03	40 � 3
					K	0.17 � 0.01	40 � 9
HD 150193	16 37 16.4	-23 47 56	8.81	A0e	I	4.99 � 0.06	57 � 1
					J	3.27 � 0.06	57 � 1
					H	2.26 � 0.03	60 � 1
					K	1.68 � 0.02	60 � 1
R Cra #2	18 58 31.8	-37 13 17	12.84	F7 III	I	1.96 � 0.10	7 � 1
					J	1.54 � 0.03	8 � 1
					H	1.09 � 0.02	9 � 1
					K	1.13 � 0.15	171 � 8
R Cra #10	18 59 48.8	-37 33 56	10.07	B8 V	I	0.63 � 0.04	167 � 2
					J	0.60 � 0.05	172 � 2
					H	0.39 � 0.05	172 � 4
					K	0.30 � 0.08	140 � 16
R Cra #12	19 01 27.7	-37 43 51	11.87	G8 III	I	0.76 � 0.05	126 � 2
					J	0.66 � 0.04	127 � 2
					H	0.40 � 0.04	131 � 3
					K	0.28 � 0.13	141 � 13
R Cra #13	19 01 58.8	-37 30 03	12.70	K1 III	I	2.71 � 0.07	97 � 1
					J	2.21 � 0.03	96 � 1
					H	1.40 � 0.03	94 � 1
					K	0.86 � 0.15	102 � 5
R Cra #15	19 01 49.5	-37 33 50	13.27	G1	I	3.18 � 0.09	96 � 1
					J	2.28 � 0.03	96 � 1
					H	1.44 � 0.06	100 � 2
					K	-	-
R Cra #22	18 59 55.8	-36 57 57	11.5	K5 III	I	1.04 � 0.07	84 � 2
					J	0.48 � 0.02	83 � 3
					H	0.29 � 0.05	80 � 5
					K	-	-
R Cra #28	18 57 36.6	-36 46 00	10.54	M5 III	I	2.10 � 0.04	52 � 1
					J	1.71 � 0.06	57 � 1
					H	1.00 � 0.04	58 � 2
					K	0.75 � 0.05	53 � 2
R Cra #30	18 58 41.4	-37 27 31	10.92	A0 V	I	1.89 � 0.04	137 � 1
					J	1.48 � 0.03	137 � 1
					H	1.03 � 0.03	139 � 1
					K	0.29 � 0.13	167 � 12
R Cra #43	18 54 58.4	-37 12 04	9.55	K0 III	I	1.73 � 0.05	66 � 1
					J	1.30 � 0.03	70 � 1
					H	0.96 � 0.04	70 � 2
					K	0.47 � 0.06	62 � 4
R Cra #46	18 56 40.0	-37 10 06	11.96	G8 III	I	2.78 � 0.07	33 � 1
					J	2.18 � 0.05	33 � 1
					H	1.37 � 0.04	32 � 1
					K	0.87 � 0.04	29 � 3
R Cra #50	18 55 26.0	-37 17 04	10.69	A6 V	I	1.05 � 0.04	33 � 1
					J	0.91 � 0.04	32 � 1
					H	0.52 � 0.05	29 � 3
					K	-	-
R Cra #52	18 55 11.1	-37 16 11	12.56	G5 III	I	1.99 � 0.08	39 � 1
					J	1.38 � 0.04	39 � 1
					H	0.84 � 0.02	38 � 1
					K	0.69 � 0.07	51 � 4
R Cra #56	19 03 01.7	-37 00 24	10.82	G5 IV	I	1.98 � 0.03	70 � 1
					J	1.41 � 0.04	70 � 1
					H	0.81 � 0.02	70 � 1
					K	0.50 � 0.10	77 � 6
R Cra #58	18 57 51.2	-37 30 20	11.47	K1 III	I	0.75 � 0.06	176 � 2
					J	0.58 � 0.04	178 � 2
					H	0.30 � 0.09	173 � 7
					K	-	-
R Cra #71	19 03 28.2	-37 13 19	12.13	F6 V	I	1.04 � 0.08	50 � 2
					J	0.74 � 0.05	52 � 2
					H	0.39 � 0.06	63 � 7
					K	-	-
R Cra #73	19 04 22.9	-37 17 48	12.38	G0 V