Alcyone Systems

Alcyone

Here is some information on Alcyone, the brightest star of the Pleiades.

Star name Alcyone, Alcione, Alkyone, Alkione, Alcyon
Constellation Taurus; Tauri (genitive)
Designation 25 eta Tau, HD 23630, SAO 76199, BS 1165
Association Pleiades, "The Seven Sisters," open cluster in Taurus
Location (epoch 2000) RA 3h 47m 29.0s; Dec +24d 06' 18"
Proper motion (arcsec/y) RA +0.019, Dec -0.044
Proper motion magnitude 0.008 arcsec/y
Spectral type B7e III
Color Blue, blue-white (type late B)
Luminosity class Giant (class III)
Pecularities Prominent emission lines
Visual magnitude 2.87
Absolute visual magnitude -2.61
Color index (B - V) -0.09
Radial veloctiy +10 km/s
Distance 407.7 ly = 125.0 pc = 3.857 Em
Mass 7 solar masses = 1 x 1031 kg
Radius 8 solar radii = 6 Gm
Surface gravity 0.1 solar gravities = 3 m/s2
Mean density 0.01 solar densities = 20 kg/m3
Rotational velocity 100 km/s
Effective temperature 13200 K
Color index (U - B)0 -0.44
Bolometric correction -0.97
Bolometric magnitude -2.5
Luminosity 700 solar luminosities = 3 x 1029 W

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