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    Alioth (Epsilon Ursae Majoris)

    Alioth
    The brightest star in the constellation Ursa Major and the third star from the end of the Big Dipper’s handle; its proper name comes from a corruption of the Arabic for “black horse.”

    Alioth is the brightest Ap star and is also an Alpha2 Canum Venaticorum star with a period of 5.1 days. Its oxygen abundance is 100,000 times greater near the magnetic equator than near the magnetic poles (which are displaced from the rotational equator and poles); the amount of chromium varies similarly. Though visually the brightest Ap star, Alioth has one of the weakest magnetic fields of this class – 15 times weaker than that observed for Cor Caroli.


    Visual magnitude 1.76
    Absolute magnitude -0.22
    Spectral type A0V
    Surface temperature 9,400 K
    Luminosity 108 Lsun
    Mass about 3 Msun
    Distance 81 light-years (25 pc)
    Position R.A. 12h 54m 01.7s,
    Dec. +55° 57' 35"
    Other designations Aliath, 77 Ursae Majoris, HR 4905, BD +56°1627, HD 112185, GCTP 2964.00, SAO 28553, FK5 483, CCDM 12540+5558, HIP 62956


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