Primary A (Cepheid) | Companion B | |
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OGLE-LMC-CEP0227 is an eclipsing binary (Cepheid variable) star, pulsating every 3.8 days. The star, in the Large Magellanic Cloud, was the first Cepheid star system found to be orbiting exactly edge on.
The binary stars orbit each other 'edge on' to the line of sight from the earth. This unique configuration has allowed astronomers to refine their understanding of Cepheid stars. Studies of this very rare system have allowed astronomers to measure the Cepheid mass with unprecedented accuracy. However, study of the stars has indicated that there is still a discrepancy between observed mass and theoretical characteristics of this type of binary star.
The two stars orbit each other every 309 days, and each has 4.14 solar masses. The primary component having an effective temperature of 5900k and the secondary a temperature of 5080K.