Mu Cep
Physical Properties
Magnitude
4.08
Range
3.4 - 5.1
Period
835 days
Variable Type
Semi-Regular Variable (Supergiant)
Spectral Type
M2-Ia
Star Color
Deep ruby red
(B-V 2.35)
Distance
1,087 ly
Position & Identifiers
RA
21h 43m 30.4s
Dec
+58° 46' 48.0"
Constellation
Cepheus
(Cep)
HR
8316
HIP
107259
Bayer
Mu
Variable ID
Mu Cep
Double Cat
15271
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Stellar Notes
ADS 15271A, SRc 3.43 - 5.1v, 730d; also a cycle of 4400d. Mean magnitude varies 13.5y. Correspondence between | polarization and light.
Large infrared excess.
Cep OB2.
Ultraviolet FeII emission. STRATOSCOPE II observations indicate infrared H2O bands.
Herschel's "Garnet Star". Both Bayer (1603) and Argelander (1843) showed Mu Cep in the position of 14 Cep = HR | 8406. Heis (1872), however, in cataloguing the stars in Argelander's Atlas, misidentified Mu as the star | currently known as the variable Mu Cep (HR 8316). A third star, 13 Cep (HR 8371), was identified in BAC and | numerous subsequent old catalogues as Mu Cep. See HR 8371, HR 8406.
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