1 And
HIP 113726; 1 And
DoubleStar
And
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
3.62
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B6III
Star Color
Blue-white
(B-V -0.09)
Distance
676.5 ly
Position & Identifiers
RA
23h 01m 55.3s
Dec
+42° 19' 34.0"
Constellation
And
HR
8762
HIP
113726
Flamsteed
1 And
Variable ID
Omi And
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Visibility
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Multiple Star System
Components
4
Component IDs
S
Separation
0.2″
Companion Mag
6.0
Companion Sp
A2
Position Angle
177°
Star Colors
A: Blue-white
B: White
Discoverer
WRH 37
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.2″ · PA: 177° · 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
Gamma Cas 3.58 - 3.65V. Photometric investigations have indicated numerous periods, particularly 0.78823, 1.0815d and | 1.5998398d, all doubtful. Form of light curve varies. Probably not an eclipsing binary. Period shell phenomena about | 23.5y. Shell features have vanished several times since 1897. H gamma varies in 3.66?d.
Separate speckle interferometric measures give sep. 0.05" (Aa) and 0.34" (AB). Ten years of observations reveal steady | change in AB position angle of about 10d with decrease in separation from about 0.375" to 0.266". Component B | identified as SB2 (see SB remarks), making total number of components at least 4.
Speckle interferometry indicates triple star. SB periods 72.3145, 8585 or 9478d. Also short period 1.5845, 0.84, | 3.66 or 1.67458d, all doubtful. Observations by Hill et al. (1988, PASP, 100, 243) indicate that one of the companions | of A is SB2, and they identify this as component B. Orbit for B: 33.01d, V0 -14.3k/s, K1 54.8k/s, K2 | 71.6k/s, m1sin3i 3.74, m2sin3i 2.86, a1sini 0.161, a2sini 0.211.
In reflection nebula; probably but not certainly associated.
Shell star. Also classified B5III or B6IVpe.
23.5y. vsini about 300k/s.
Survey Image
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