Sheliak
HIP 92420; Beta Lyr; 10 Lyr
Showpiece (76/100)
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
12.9 days
Variable Type
DPV:/EB
Spectral Type
A8. :V COMP,SB
Star Color
White
(B-V 0.00)
Distance
959 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
Querying VizieR catalog...
Visibility
Set a location in User Settings to see visibility data.
Light Curve
Comparison Stars for Sheliak (3.2–4.4)
Nearby stable stars for estimating brightness (AAVSO)
Loading comparison stars…
Multiple Star System C,D,E: optical
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
Querying VizieR for stellar data…
Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
Loading HR diagram…
Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Fusion
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
Loading survey image…