VV Cep
HIP 108317
DoubleStar
Cep
Visible
Level 6
Professional/Research - Requires steady seeing
Physical Properties
Magnitude
4.91
Range
4.73 - 5.55
Period
7430.500 days
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
M2Iaep+B8Ve
Star Color
Red
(B-V 1.77)
Distance
815.4 ly
Position & Identifiers
RA
21h 56m 39.1s
Dec
+63° 37' 32.0"
Constellation
Cep
HR
8383
HIP
108317
Variable ID
VV Cep
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Visibility
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Light Curve
Multiple Star System
Separation
0.1″
Companion Sp
B1V
Position Angle
175°
Star Colors
A: Red
B: Blue
Discoverer
WRH 36
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: 175° · N up, E left
Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
EA 4.80 - 5.36V, 6.65 - 7.46p, 7430d. Also slow oscillations, amp. 0.15, per. 13.7y and amp. 0.03, per. 349d. Red | observations indicate Sr amp. 0.4m, 58d. H alpha varies in 118.37d, period stable over 20y interval. This is probably | the pulsation period of the red component. Amplitude varies in period 825d or more. The blue companion may be | intrinsically variable. VV Cep also magnetic variable.
A* var. M2Iab, B6IIe. Combined mag., colors. Absolute magnitudes based on astrometric and spectroscopic data are | -4.0V for red component, -2.3 for the blue.
7430.5d, K 19.4k/s, V0 -20.2k/s, msin3i 18.0, asini 1860. The SB secondary is probably also the visual | companion. Mass transfer from red star to the hot companion. SB unresolved by speckle interferometry at 4-meter Mayall | telescope in 1975-6.
Cep OB2.
Companion variously classified B9, B8Ve, and B6II.
Survey Image
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