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 mag....
Found on http://en.wikipedia.org/wiki/AO_Cassiopeiae

AO Cassiopeiae

One of the most massive and luminous binary systems known. AO Cassiopeiae (HD 1337A and B) is an elliptic and semidetached eclipsing binary consisting of two O stars (O9III) of 32 solar masses and 23 solar radii, and 30 solar masses and 15 solar radii, respectively. The two stars orbit so closely, w...
Found on http://www.daviddarling.info/encyclopedia/A/AO_Cassiopeiae.html
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