EW Lac
Observable Variable Star
Good (49/100)
Range: 5.2 - 5.5, Period: 16.8h, Type: Gamma Cas
HIP 113327
VariableStar
Lac
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
5.43
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B4IIIep
Star Color
Blue-white
(B-V -0.09)
Position & Identifiers
RA
22h 57m 04.5s
Dec
+48° 41' 03.0"
Constellation
Lac
HR
8731
HIP
113327
Variable ID
EW Lac
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Visibility
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Comparison Stars for EW Lac (5.2–5.5)
Nearby stable stars for estimating brightness (AAVSO)
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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 5.22 - 5.48V, 5.0 - 5.3p; later observations 5.15 - 5.21V. Amp. variable. Periods at different times have | varied from 0.7364 in 1951 to between 0.800 and 0.700d; more recent periods were a choice in 1980 between 0.725 and | 0.418d; 0.711 in 1981 and then 0.722d. Also indications of long-term changes. Spectrum variable 2.4 - 10.8y. Spectrum | also indicates atmospheric quasi-periodic pulsations of about 1d. Strong spectrum and color changes in 1978.
Shell star.
Variation in envelope, about 19d. Non-expanding over 50y. Rotating metal shell.
Survey Image
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