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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

 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

mV

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

Back to page contents


"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, Pmax, occurs at the wavelength lmax.

 

Star

R.A. (1950)

Dec. (1950)

Pmax (%)

lmax (Ám)

P.A (degrees)

mV

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

Back to page contents


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)

mV

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

I

1.80 ▒ 0.07

86 ▒ 1

J

1.16 ▒ 0.05

84 ▒ 1

H

0.75 ▒ 0.01

86 ▒ 1

K

-

-

R Cra #88

19 02 47.0

-37 22 48

-

G8

I

4.86 ▒ 0.13

87 ▒ 1

J

3.87 ▒ 0.06

90 ▒ 1

H

2.73 ▒ 0.07

92 ▒ 1

K

1.84 ▒ 0.09

95 ▒ 1

TY Cra

(variable)

18 58 18.5

-36 56 51

9.10v

B9e

I

0.74 ▒ 0.06

94 ▒ 2

J

0.43 ▒ 0.07

89 ▒ 3

H

0.41 ▒ 0.05

106 ▒ 3

K

0.26 ▒ 0.03

104 ▒ 4

Cyg OB2 A

20 30 43.7

+41 03 53

13.12

OB

I

4.57 ▒ 0.07

118 ▒ 1

J

1.85 ▒ 0.08

119 ▒ 1

H

0.81 ▒ 0.04

121 ▒ 1

K

0.53 ▒ 0.06

126 ▒ 4

Cyg OB2 No.3

20 29 49.9

+41 03 08

10.22

O9

I

4.60 ▒ 0.06

106 ▒ 1

J

2.80 ▒ 0.03

105 ▒ 1

H

1.81 ▒ 0.03

105 ▒ 1

K

1.15 ▒ 0.04

108 ▒ 1

Cyg OB2 No.4

20 30 26.3

+41 16 57

10.22

O7 III

I

1.63 ▒ 0.05

75 ▒ 1

J

0.92 ▒ 0.03

81 ▒ 2

H

0.55 ▒ 0.03

79 ▒ 3

K

0.33 ▒ 0.07

52 ▒ 10

Cyg OB2 No.5

(variable)

20 30 34.8

+41 08 04

9.1

O7f

I

3.17 ▒ 0.03

82 ▒ 1

J

0.78 ▒ 0.02

52 ▒ 1

H

0.42 ▒ 0.03

46 ▒ 4

K

0.13 ▒ 0.09

37 ▒ 21

Cyg OB2 No.6

20 30 58.0

+41 15 20

10.67

O8 V

I

1.31 ▒ 0.03

50 ▒ 1

J

0.78 ▒ 0.02

52 ▒ 1

H

0.42 ▒ 0.03

46 ▒ 4

K

0.13 ▒ 0.09

37 ▒ 21

Cyg OB2 No.7

20 31 26.5

+41 10 04

10.5

O3 If

I

3.02 ▒ 0.03

95 ▒ 1

J

1.77 ▒ 0.02

96 ▒ 1

H

1.14 ▒ 0.02

95 ▒ 1

K

0.76 ▒ 0.04

98 ▒ 2

Cyg OB2 No.8A

20 31 27.4

+41 08 33

8.98

O6 If

I

1.20 ▒ 0.04

79 ▒ 2

J

0.78 ▒ 0.02

81 ▒ 1

H

0.46 ▒ 0.02

82 ▒ 2

K

0.30 ▒ 0.03

79 ▒ 1

Cyg OB2 No.9

20 31 23.0

+41 04 51

10.8

O5 If

I

2.21 ▒ 0.04

47 ▒ 1

J

1.34 ▒ 0.04

45 ▒ 1

H

0.81 ▒ 0.04

44 ▒ 2

K

0.58 ▒ 0.04

51 ▒ 3

Cyg OB2 No.10

20 31 58.6

+41 22 39

9.88

O9.5 Ia

I

0.39 ▒ 0.04

47 ▒ 4

J

0.15 ▒ 0.04

50 ▒ 2

H

0.13 ▒ 0.03

34 ▒ 8

K

-

-

Cyg OB2 No. 11

20 32 21.2

+41 26 39

10.04

O5 If

I

2.78 ▒ 0.03

159 ▒ 1

J

1.75 ▒ 0.02

160 ▒ 1

H

1.13 ▒ 0.02

157 ▒ 1

K

0.79 ▒ 0.04

160 ▒ 2

Cyg OB2 No. 12

20 30 53.2

+41 04 14

11.47

B5 Ia

I

7.06 ▒ 0.05

117 ▒ 1

J

3.90 ▒ 0.04

116 ▒ 1

H

2.35 ▒ 0.02

115 ▒ 1

K

1.65 ▒ 0.02

118 ▒ 1

Cyg OB2 No. 14

20 30 29.1

+41 15 21

11.61

OB

I

2.63 ▒ 0.04

88 ▒ 1

J

1.54 ▒ 0.02

88 ▒ 1

H

0.96 ▒ 0.03

87 ▒ 1

K

-

-

Cyg OB2 No. 15

20 30 40.1

+41 16 00

11.28

O8

I

2.61 ▒ 0.06

85 ▒ 1

J

1.43 ▒ 0.06

85 ▒ 1

H

0.96 ▒ 0.03

87 ▒ 1

K

0.74 ▒ 0.25

85 ▒ 3

Cyg OB2 No. 17

20 31 28.1

+41 09 59

11.75

OB

I

3.36 ▒ 0.06

97 ▒ 1

J

2.02 ▒ 0.04

98 ▒ 1

H

1.28 ▒ 0.03

98 ▒ 1

K

-

-

Cyg OB2 No. 18

20 31 43.0

+41 05 05

11.09

OB

I

1.43 ▒ 0.05

106 ▒ 1

J

1.00 ▒ 0.02

105 ▒ 1

H

0.66 ▒ 0.05

104 ▒ 2

K

0.41 ▒ 0.05

108 ▒ 4

Cyg OB2 No. 19

20 31 51.5

+41 09 08

11.06

B0

I

2.33 ▒ 0.04

95 ▒ 1

J

1.55 ▒ 0.02

95 ▒ 1

H

0.98 ▒ 0.02

96 ▒ 1

K

0.57 ▒ 0.04

104 ▒ 3

Cyg OB2 No. 21

20 30 40.1

+41 18 37

11.50

B1

I

2.69 ▒ 0.07

54 ▒ 1

J

1.74 ▒ 0.05

55 ▒ 1

H

1.28 ▒ 0.08

56 ▒ 2

K

-

-

Cyg OB2 No. 22

20 31 21.1

+41 03 00

11.68

O5

I

1.58 ▒ 0.05

0 ▒ 1

J

1.02 ▒ 0.02

2 ▒ 1

H

0.66 ▒ 0.02

2 ▒ 1

K

0.42 ▒ 0.04

7 ▒ 2

Cyg OB2 No. 24

20 31 29.7

+41 06 52

11.97

O7

I

2.13 ▒ 0.05

62 ▒ 1

J

1.36 ▒ 0.03

63 ▒ 1

H

0.89 ▒ 0.03

65 ▒ 2

K

0.43 ▒ 0.16

84 ▒ 13

Cyg OB2 No. 25

20 31 38.3

+41 23 06

11.88

OB

I

3.11 ▒ 0.04

65 ▒ 1

J

1.71 ▒ 0.04

66 ▒ 1

H

1.10 ▒ 0.02

64 ▒ 1

K

0.55 ▒ 0.10

78 ▒ 7

NGC7380 HD215806

22 44 40.7

+58 01 53

9.15

B0 Ia

I

1.53 ▒ 0.05

67 ▒ 1

J

0.77 ▒ 0.06

75 ▒ 3

H

0.58 ▒ 0.05

79 ▒ 3

K

0.55 ▒ 0.06

77 ▒ 12

BD +57║2615

22 45 48.1

+57 52 47

10.24

B3

I

1.71 ▒ 0.05

41 ▒ 1

J

0.73 ▒ 0.10

30 ▒ 3

H

0.72 ▒ 0.06

26 ▒ 3

K

-

-

BD +57║2617

22 46 08.9

+57 46 35

10.2

B8

I

0.83 ▒ 0.07

59 ▒ 3

J

0.51 ▒ 0.03

60 ▒ 1

H

0.26 ▒ 0.06

41 ▒ 7

K

-

-

BD +57║22453

22 45 19.7

+57 53 53

10.8

OB

I

1.39 ▒ 0.08

70 ▒ 2

J

0.73 ▒ 0.07

71 ▒ 3

H

-

-

K

-

-

 

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Last modification : 6 July 2000
Last modification author : Chris Davis
Original Author : Antonio Chrysostomou

Contact: Tom Kerr. Updated: Fri Aug 3 11:39:26 HST 2007

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