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NOTES ON DOUBLE STARS - COLOUR ESTIMATES

DOUBLE STAR COLOUR ESTIMATES (I-III)
(1 9 7 9 - 1 9 8 0)

Conducted by
the Astronomical Society of New South Wales Inc. (1979-1980)

Produced by Andrew James (1979-80) and
Updated (2002)

I N T R O D U C T I O N

The following is the final results of a Colour Estimates program conducted by the Astronomical Society of New South Wales and its Double Star Section that was formed in 1979. The main aim was to get people out observing double stars and at the time the program proved quite successful and enjoyable. Members and others observed both colours and estimated the Delta-m (difference in magnitude).
The methodology and details will be posted at a later date, as I am updating much of the reference data now so much better than 24 years ago ! (2005)

CONTAINS
64 Double Stars and 1 Variable
By : 39 Observers and 1350 Observations


Descriptor
PRIMARY 		Descriptor
SECONDARY 		Δm STD DEV
Beta PsA Yellow-orange Yellowish-orange 2.7 0.2
Gamma PsA White Orange-yellow 4.0 1.1
Delta PsA Orange Red IC **
Kappa Tuc Yellowish Orange 2.5 **
Lambda Tuc Yellowish Yellow 0.8 0.5
Theta Phe White Yellowish-White ** 0.0
Tau Scl White -- ** **
Epsilon Scl Yellowish Orangey-red ** **
Kappa Scl White Yellow ** **
Gamma Ari White Yellow-white 0.2 0.2
Alpha Psc Yellowish White 0.4 0.1
p Eri Yellow Yellow 0.2 0.2
Theta Eri White Blue-white 1.1 0.5
Gamma Cae Orange-white -- 4.0 **
Alpha Col Blue-white White ** **
Alpha CMa Blue-white -- ** **
Epsilon CMa White White 6.0 1.6
Pi CMa Yellow Orange 3.3 0.5
17 CMa Yellowish-white Orange 2.7 1.7
Beta Ori Bluish Blue-white 6.5 1.2
Gamma Vol Orangey-yellow White 1.7 0.5
Gamma Vel (AB) White (Hint of Blue) White 1.9 0.5
Gamma Vel (CD) White (Hint of Yellow) Orangey-white 0.8 0.5
h2 Pup Orangey-yellow White (Tint of Blue) 4.6 0.6
x Vel Orange-yellow Pale Blue 1.8 1.1
Sigma Pup Pure Orange White 4.4 1.5
Alpha Leo Blue-White Yellowish-orange 5.8 1.0
Gamma Leo Pure Yellow Yellow (Yellowish) 1.0 0.6
Epsilon Leo Yellow White? >14 **
Gamma Vir Yellowish Yellowish 0.1 0.2
Alpha Cen Yellowish Yellowish(Darker) 1.0 0.4
Gamma Cen Pure White White (Yellowish) 0.1 0.2
Gamma Cru Orange (Faint Yellow) Blue-white 4.0 1.7
Alpha (1) Cru Bluish Bluish (Lighter) 0.3 0.3
Mu Crucis White (Tint of Blue) Yellowish-white 1.0 0.5
Beta Mus Blue-white Blue-white 0.3 0.3
Theta Mus Yellowish Yellowish (White) 2.1 0.9
Alpha Cir Yellowish-white Orange White 4.5 1.0
Epsilon Cha Yellowish White Yellowish 0.5 0.3
Alpha Lib Blue-white Yellowish 2.3 1.0
2 Sco Yellowish Blue-white 2.3 0.2
12 Sco Yellowish-White Yellowish-white 3.1 0.9
Alpha Sco Orangey-red Green 4.6 0.5
Iota TrA Bluish Whie 3.7 1.2
Rho Oph Yellowish-white White 0.5 0.3
Gamma Ara Blue-white Blue-white (More Blue) 6.2 0.5
61 Oph Bluish-white White 0.5 0.8
70 Oph Yellow Orange-yellow 2.3 0.8
Epsilon (1,2) Lyr Yellowish-white Yellowish-white 0.2 0.2
Beta Cyg Orange-yellow Blue (Tending Bluish) 2.0 0.4
Epsilon Sag Yellowish-white Bluish 1.8 1.0
Hh 630 Yellow-orange White 2.8 1.5
Zeta Sag White Yellowish-white 4.2 1.4
Theta Sag Yellowish-white White (Touch Blue) 2.7 1.0
Beta Cap Yellow Bluish 2.2 0.8
Pi Cap White (Touch Bluish) Yellow 3.4 0.4
Omicron Cap White White 0.2 0.2
Alpha (1) Cap Yellow White 5.1 1.2
Kappa Peg Yellowish White (Touch Bluish) 4.3 2.6
Eta Sgr Orange IC 5.3 0.8
4 Aqr -- -- 1.3 --
21 Sgr Yellowish-orange Yellowish 2.5 0.6
Gamma CrA Yellowish Yellowish 0.1 0.1
W Ori Reddish-orange N/A ** **

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Last Update : 28 March 2005

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