Eagle Creek Observatory
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Color Contrasted Double Stars
Here is a listing of several very beautiful double star systems where the color difference between stars is striking.

Name Const SAO RA Dec Mag1 Mag2 Sep Comments
Pi And 54033 00 36.9 +33 43 4.5 8.5 36 White and blue
Gamma And 37734 02 03.9 +42 19 2.3 5.5 9.7 Orange and blue or orange and yellow
Tau 1 (69) Aqr   22 47.3 -14 03 5.7 9.2 26 White and pale red
94 Aqr   23 19.1 -13 27 5.3 7.3 13 Reddish-white and light blue
107 Aqr   23 46.0 -18 40 5.4 5.7 7 White and blue or white and yellow-white
1 Ari 74966 01 50.2 +22 16 5.8 7.1 2.8 White and green
Gamma Ari 92680 01 53.6 +19 17 4.6 4.7 7.6 Orange and green or both white
Lambda Ari   01 57.9 +23 36 4.8 7.6 37.5 Yellow and blue
30 Ari   02 37.0 +24 39 6.2 7.2 39 Yellow and blue
14 Aur   05 15.4 +32 41 5.4 7.5 14 Pale yellow and orange
Epsilon Boo   14 45.0 +27 04 2.5 4.9 2.8 Yellow-orange and blue
Xi Boo   14 51.4 +19 05 4.7 7 6.9 Yellow and red
Delta Boo   15 15.5 +33 18 3.5 8.7 105 Light yellow and light blue
Beta Cap   20 21.0 -14 46 3.2 6.2 205 Orange-yellow and sky blue
S3053 Cas 10937 00 02.6 +66 06 5.9 7.3 15.2 Red and White
Alpha Cas 21609 00 40.6 +56 32 2.2 8.9 69.8 Reddish-white + blue
Eta Cas 21732 00 49.1 +57 49 3.7 7.5 12.8 Yel-wht+red-purple, or light yel +org, or gold+purple, or yel+red
Beta Cep   21 28.7 +70 34 3.2 7.9 13.3 White and blue
S2893 Cep   22 12.9 +73 19 6.1 8.3 29  
Delta Cep   22 29.2 +58 24 3.9 6.3 41 Orange and blue
Iota Cnc   08 46.7 +28 45 4.2 6.6 30 Yellow and blue or gold and light blue
17 Com   12 28.9 +25 54 5.4 6.7 145 White and lilac
24 Com   12 35.1 +18 22 5.2 6.7 20.3 Orange and emerald or gold and blue
Zeta CrB   15 39.4 +36 38 5.1 6 6.3 Blue-white and blue
Delta Crv   12 29.9 -16 31 3.1 8.6 24.2 Yellow and red-purple
Alpha CVn   12 56.1 +38 18 2.9 5.8 19.4 Blue-white both or blue-white and green
Beta Cyg 87301 19 30.8 +27 57 3.1 5.1 34.4 Gold and blue or yellow and green
Omicron (31) Cyg   20 13.7 +46 44 3.8 4.8 107 orange, blue, blue(Mag 6.7, 337s), and a 4th 13 mag at 34
52 Cyg 70467 20 45.7 +30 43 4.3 0 6.5 Orange and blue
Gamma Del   20 46.7 +16 07 4.3 5.2 9.3 Yellow and green
32 Eri   03 54.3 -02 57 4.7 6.2 6.8 Yellow and greenish blue
Alpha Her   17 14.7 +14 23 3.2 5.4 4.7 Orange and blue-green
95 Her   18 01.5 +21 35 5 5.1 6.3 Green and red-yellow
Tau 1 Hya   09 29.0 -02 46 4.6 7.2 66 White and lilac
Tau Leo   11 28.0 +02 50 5.2 7 90 Yellow and blue
Gamma Lep   05 44.5 -22 27 3.8 6.5 95 Yellow and red
Iota Lib   15 12.3 -19 47 4.7 9.4 58 Pale yellow and red-purple
Zeta Lyr   18 44.8 +37 36 4.3 5.9 44 Red and blue-green
Delta 1+2 Lyr   18 54.0 +36 55 5.6 4.3 600 Not a true double
Omicron Oph   17 18.0 -24 17 5.2 6.6 10.3 Yellow and pale blue or orange and blue
70 Oph   18 05.5 +02 30 4.2 6 4 Yellow and red-orange
Rho Ori   05 13.3 +02 51 5 9 7 Yellow and pale orange
Iota Ori   05 35.4 -05 54 2.8 7 11.3 White, light-green, and purple(Mag 7.5, 50s from primary)
Eta Per   02 50.7 +55 53 3.8 8.5 28.3 Gold and royal blue
Iota Tri   02 12.4 +30 18 5.3 6.9 3.9 Yellow and blue
Gamma+11 Umi   15 18.5 +71 50 3 5.1 17 Not a true double


For more on star colors and what they can tell us about the star click here.

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Information gathered from several sources on the net including my own observations
Page 2002 Kevin Muenzler, Eagle Creek Observatory.