Tianguan
HIP 26451; Zeta Tau; 123 Tau
HIP 26451; Zeta Tau; 123 Tau
Star
Tau
Visible
Level 1
Naked eye / Binoculars
Physical Properties
Magnitude
3.00
Range
2.8 - 3.17
Period
132.974 days
Variable Type
E/GS+GCAS
Spectral Type
B1IVe shell
Star Color
Blue
(B-V -0.19)
Distance
438.4 ly
Position & Identifiers
RA
05h 37m 38.7s
Dec
+21° 08' 33.0"
Constellation
Tau
HR
1910
HIP
26451
Bayer
Zeta
Flamsteed
123 Tau
Variable ID
Zet Tau
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Visibility
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Light Curve
Multiple Star System
Separation
0.0″
Star Colors
A: Blue
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 2.90 - 3.03V. Var. shell Sp. Widths H-lines vary in about 10 min. Polarization at H beta changes in tens | of minutes, probably due to circumstellar matter.
132.91d, K 8.9k/s, V0 +21.8k/s, asini = 16.1. 3.2, 5.2v, sep. 0.007". Common circumstellar envelope. The 132.9d | period is superimposed on a 7y pseudo-period related to oscillation of envelope.
Color excess E(B-V) = +0.09.
Cas-Tau OB1.
Lyman beta observed from COPERNICUS. Spectra obtained from AEROBEE rocket show absorption features at 1920 (FeIII) | and 1720A (AlII) associated with extended atmosphere or circumstellar shell. Also classified B2IVp.
Rapidly rotating star. Rotational velocity varies with wavelength: vsini about 300k/s in visual, 150 or less in UV. | Expanding circumstellar shell. Shell-line velocities do not correspond to orbital elements; possibly gaseous ring. | Unstable shell star with pseudo-periodic phenomena.
Survey Image
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