31 Cyg
Physical Properties
Magnitude
3.79
Range
3.73 - 3.89
Period
3784 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
K2II+...
Star Color
Red
(B-V 1.28)
Distance
871 ly
Position & Identifiers
RA
20h 13m 37.9s
Dec
+46° 44' 29.0"
Constellation
Cygnus
(Cyg)
HR
7735
HIP
99675
Flamsteed
31 Cyg
Variable ID
V695 Cyg
Double Cat
13554
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Spectral Classification
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Stellar Absorption Spectrum
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Stellar Fusion
Stellar Notes
ADS 13554A, EA 3.77 - 3.88V, 3784.3d. Amp. varies strongly with wavelength. C = NSV 12931, 6.98V.
Component C, 6.99V, -0.14(B-V), -0.58(U-B) B5V, vsini : 25k/s, at 107" fixed. AP probably single star.
ADS 13554A, 3784.3d, K 14.0k/s, V0 -7.7k/s, msin3i 9.19, asini 711. Unresolved by speckle interferometry. SKYLAB | indicates cool star with hot companion. vsini of secondary 80k/s.
Also classified K4Iab + B4IV-V.
See HR 7730.
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