AO Cas
Observable Variable Star
Excellent (61/100)
Range: 6.0 - 6.1, Period: 3.5d, Type: EB
HIP 1415
VariableStar
Cas
Visible
Level 3
Medium telescope (6-8") - Monitor brightness changes
Physical Properties
Magnitude
6.14
Variable Type
Eclipsing Binary (Beta Lyrae-type)
Spectral Type
O9IIInn
Star Color
Blue-white
(B-V -0.13)
Position & Identifiers
RA
00h 17m 43.0s
Dec
+51° 25' 59.0"
Constellation
Cas
HR
65
HIP
1415
Variable ID
AO Cas
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Visibility
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Comparison Stars for AO Cas (6.0–6.1)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
2.8″
Companion Mag
15.0
Companion Sp
O8V
Position Angle
186°
Star Colors
A: Blue-white
B: Blue
Discoverer
TRN 8
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 2.8″ · PA: 186° · N up, E left
At limit · 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
EB 5.96 - 6.11B, 6.07 - 6.24V, O9III+O9III, 3.523487d. Spontaneous var. in period. Polarization indicates | circumstellar envelope possibly related to mass exchange.
3.5236d, K 223.4k/s, V0 -31.1k/s, msin3i 10.1, asini 10.8. Apsidal period about 70y? vsini of secondary 145k/s.
In neutral hydrogen region.
Also classified O9IIIn, O9.5III, O8, and O9.5I. There are also indications of two O9III components.
Survey Image
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