标题： PLANET观测下二元透镜事件OGLE-2002-BLG-069的完全特征描述 显示英文标题

标题： Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

摘要： 我们分析了PLANET和OGLE获得的关于引力透镜事件OGLE-2002-BLG-069的数据。由于该事件具有出色的光度和光谱覆盖，我们可以限制透镜模型直到已知的近双星透镜和远双星透镜之间的模糊性。年度视差的检测与扩展源效应的测量相结合，使我们能够确定竞争模型中透镜成分的质量、距离和速度。虽然涉及近双星透镜的模型导致了一个质量为M=(0.51 +- 0.15) M_sol且距离为D_L=(2.9 +- 0.4) kpc的Bulge-Disc透镜情景，但远双星透镜解需要一个相当不合理的双黑洞透镜（M >=126 M_sol）。此外，我们比较了当前最先进的数值和经验模型，用于描述源的表面亮度分布，即G5III Bulge巨星。我们发现源恒星大气的线性边缘消光模型与数据一致，而假设LTE且没有自由参数的PHOENIX大气模型未能匹配我们的观测。 显示英文摘要

摘要： We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M=(0.51 +- 0.15) M_sol and distance of D_L=(2.9 +- 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens (M >=126 M_sol). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.