Sheliak
HIP 92420; Beta Lyr; 10 Lyr
Observable Double Star
Sep: 45.5", Companion: mag 6.7
Observable Variable Star
Excellent (70/100)
Range: 3.3 - 4.35, Period: 12.9d, Type: DPV:/EB
HIP 92420; Beta Lyr; 10 Lyr
VariableStar
Lyr
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
3.45
Range
3.3 - 4.35
Period
12.940 days
Variable Type
DPV:/EB
Spectral Type
A8. :V COMP,SB
Star Color
White
(B-V 0.00)
Distance
959.2 ly
Position & Identifiers
RA
18h 50m 04.8s
Dec
+33° 21' 46.0"
Constellation
Lyr
HR
7106
HIP
92420
Bayer
Beta
Flamsteed
10 Lyr
Variable ID
Bet Lyr
Double Cat
11745
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Visibility
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Light Curve
Comparison Stars for Sheliak (3.2–4.4)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
6
Component IDs
AB
Separation
45.5″
Companion Mag
6.7
Companion Sp
B4V
Position Angle
148°
Star Colors
A: White
B: Blue
Discoverer
STFA 39
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 45.5″ · PA: 148° · N up, E left
Resolved · 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
ADS 11745A, EB 3.25 - 4.36V, 12.913834d. Period varies. Presumed disk around secondary. Also radio flare activity. | Prototype Beta Lyrae type, discovered by Goodricke in 1874.
AB fixed. B is 8.6v, B7v; may be collapsed star; vsini 120k/s. E, 9.9v A8pSr or B9V at 67" optical? F, 9.9v A8-9V or | or B9V at 86". A, B, E and F are CPM.
ADS 11745A, 12.9349d, K 184.0k/s, V0 -17.8k/s, asini 32.7. Also 4.2y. Possible radio binary. ADS 11745B also SB, | 4.34d, K 12.0k/s, V0 -29.4k/s, asini 0.695.
Large infrared excess.
Member of the local association (Pleiades group).
Shell star. Far UV COPERNICUS spectrum shows many emission lines, some with P Cygni profiles, presumably originating | from a hotter source than the visual primary. Helium I line 10830 arises in outermost envelope which surrounds the | Beta Lyrae system as a whole. Radio and X-ray source.
Sheliak; Shelyak; Shiliak.
Survey Image
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