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AO Cassiopeiae : ウィキペディア英語版 | AO Cassiopeiae
AO Cassiopeiae, also known as Pearce's Star, is a binary system, composed of two massive hot blue stars of spectral types O7/O9III and O8/O9III that each weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of our Sun respectively.〔 The system is an eclipsing binary with a period of roughly 3.5 days, with the apparent magnitude ranging between 6.07 and 6.24. Stars of this brightness are generally just visible to the unaided eye in dark skies in semirural locations. The component stars are so close to each other they are ellipsoidal (egg-shaped).〔()〕 ==References==
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