南洋杉计划晚型双星系统的LMC距离的确定：I. OGLE-051019 .64-685812.3
The Araucaria Project. Determination of the LMC Distance from Late-Type Eclipsing Binary Systems: I. OGLE-051019.64-685812.3
摘要：
我们分析了大麦哲伦星云中的双线食双星系统OGLE-051019.64-685812.3，它由两个有效温度非常相似的G4巨星组成。详细分析的OGLE I波段光变曲线的系统，径向速度曲线的两个组件来自高分辨率光谱，和近红外星等的双星系统外测得的食，使我们能够获得一个准确的轨道解决方案，这食双星，其基本的物理参数。利用巨星的表面亮度-（V-K）色关系，我们计算了到该系统的距离，得到了18.50等的真实距离模，估计总的不确定度为~ 3%。我们已经发现了LMC中更多类似的食双星系统，并且我们目前正在获得相关数据，这将使我们能够更好地检查该方法的系统性，并最终提供精确到1%的LMC距离测定，因此需要校准距离尺度。
英文摘要：
We have analyzed the double-lined eclipsing binary system OGLE-051019.64-685812.3 in the LMC which consists of two G4 giant components with very similar effective temperatures. A detailed analysis of the OGLE I-band light curve of the system, radial velocity curves for both components derived from high-resolution spectra, and near-infrared magnitudes of the binary system measured outside the eclipses has allowed us to obtain an accurate orbit solution for this eclipsing binary, and its fundamental physical parameters. Using a surface brightness-(V-K) color relation for giant stars we have calculated the distance to the system and obtain a true distance modulus of 18.50 mag, with an estimated total uncertainty of ~ 3 %. More similar eclipsing binary systems in the LMC which we have discovered and for which we are currently obtaining the relevant data will allow us to better check on the systematics of the method and eventually provide a distance determination to the LMC accurate to 1 percent, so much needed for the calibration of the distance scale.
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