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OGLE-LMC-CEP0227
OGLE-LMC-CEP0227 is an eclipsing binary (Cepheid variable) star,〔Hilding R. Neilson and Norbert Langer, (Is there a mass discrepancy in the Cepheid binary ), Astronomy & Astrophysics
ESO 2011 November 1, 2011.〕 pulsating every 310 days.〔Jonathan Nally, ( Pulsating star mystery solved ).〕 The star, in the Large Magellanic Cloud, was the first Cepheid star system found to be orbiting exactly edge on.〔( Pulsating star mystery solved ) November 24, 2010.〕
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.〔( Remarkable Double Star OGLE-LMC-CEP0227 ).〕 However, study of the stars〔H. R. Neilson and N. Langer, ( Is there a mass discrepancy in the Cepheid binary OGLE-LMC-CEP0227? ) Astronomy and Astrophysics Volume 537 (January 2012) A&A, 537.〕〔1.G. Pietrzyński, I. B. Thompson, W. Gieren, D. Graczyk, G. Bono, A. Udalski, I. Soszyński, D. Minniti, B. Pilecki. The dynamical mass of a classical Cepheid variable star in an eclipsing binary system. Nature, 2010; 468: 545-548 DOI:10.〕 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.〔G. Pietrzyński, I. B. Thompson, W. Gieren, D. Graczyk, G. Bono,
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