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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 the 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 Δm (difference in magnitude).

General methodology will be posted at some later date, as I am updating much of the reference data that is now so much better than thirty (30) years ago ! (2011)

CONTAINS
64 Double Stars and 1 Variable
Made by 39 Observers and 1350 Observations


Star
Name		 Descriptor
PRIMARY		 Descriptor
SECONDARY		 Δm Std.
Dev.
Beta (β) PsA Yellow-orange Yellowish-orange 2.7 0.2
Gamma (γ) PsA White Orange-yellow 4.0 1.1
Delta (δ) PsA Orange Red IC **
Kappa (κ) Tuc Yellowish Orange 2.5 **
Lambda (λ) Tuc Yellowish Yellow 0.8 0.5
Theta (θ) Phe White Yellowish-White ** 0.0
Tau (τ) Scl White -- ** **
Epsilon (ε) Scl Yellowish Orangey-red ** **
Kappa (κ) Scl White Yellow ** **
Gamma (γ) Ari White Yellow-white 0.2 0.2
Alpha (α) Psc Yellowish White 0.4 0.1
p Eri / Δ5 Yellow Yellow 0.2 0.2
Theta (θ) Eri White Blue-white 1.1 0.5
Gamma (γ) Cae Orange-white -- 4.0 **
Alpha (α) Col Blue-white White ** **
Alpha (α) CMa Blue-white -- ** **
Epsilon (ε) CMa White White 6.0 1.6
Pi (π) CMa Yellow Orange 3.3 0.5
17 CMa Yellowish-white Orange 2.7 1.7
Beta (β) Ori Bluish Blue-white 6.5 1.2
Gamma (β) Vol Orangey-yellow White 1.7 0.5
Gamma (β) Vel (AB) White (Hint of Blue) White 1.9 0.5
Gamma (γ) 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 / Δ95 Orange-yellow Pale Blue 1.8 1.1
Sigma (σ) Pup Pure Orange White 4.4 1.5
Alpha (α) Leo Blue-White Yellowish-orange 5.8 1.0
Gamma (γ) Leo Pure Yellow Yellow (Yellowish) 1.0 0.6
Epsilon (ε) Leo Yellow White? >14 **
Gamma (γ) Vir Yellowish Yellowish 0.1 0.2
Alpha (α1,2) Cen Yellowish Yellowish(Darker) 1.0 0.4
Gamma (γ) Cen Pure White White (Yellowish) 0.1 0.2
Gamma (γ) Cru Orange (Faint Yellow) Blue-white 4.0 1.7
Alpha (α1) Cru Bluish Bluish (Lighter) 0.3 0.3
Mu (μ) Crucis White (Tint of Blue) Yellowish-white 1.0 0.5
Beta (β) Mus Blue-white Blue-white 0.3 0.3
Theta (θ) Mus Yellowish Yellowish (White) 2.1 0.9
Alpha (α) Cir Yellowish-white Orange White 4.5 1.0
Epsilon (ε) 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 (α) Sco Orangey-red Green 4.6 0.5
Iota (ι) TrA Bluish Whie 3.7 1.2
Rho (ρ) Oph Yellowish-white White 0.5 0.3
Gamma (γ) 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 (ε1,2) Lyr Yellowish-white Yellowish-white 0.2 0.2
Beta (β) Cyg Orange-yellow Blue (Tending Bluish) 2.0 0.4
Epsilon (ε) Sag Yellowish-white Bluish 1.8 1.0
Hh 630 Yellow-orange White 2.8 1.5
Zeta (ζ) Sag White Yellowish-white 4.2 1.4
Theta (θ) Sag Yellowish-white White (Touch Blue) 2.7 1.0
Beta (β) Cap Yellow Bluish 2.2 0.8
Pi (π) Cap White (Touch Bluish) Yellow 3.4 0.4
Omicron (ο) Cap White White 0.2 0.2
Alpha (α1) Cap Yellow White 5.1 1.2
Kappa (κ) Peg Yellowish White (Touch Bluish) 4.3 2.6
Eta (η) Sgr Orange IC 5.3 0.8
4 Aqr -- -- 1.3 --
21 Sgr Yellowish-orange Yellowish 2.5 0.6
Gamma (γ) CrA Yellowish Yellowish 0.1 0.1
W Ori Reddish-orange N/A ** **

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Last Update : 4th October 2012

Southern Astronomical Delights © (2012)

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