论文标题
朝着早期型折叠式二进制物作为外层次的里程碑：ii。 NLTE spectral analysis and stellar parameters of the detached O-type system OGLE-LMC-ECL-06782 in the LMC
Towards early-type eclipsing binaries as extragalactic milestones: II. NLTE spectral analysis and stellar parameters of the detached O-type system OGLE-LMC-ECL-06782 in the LMC
论文作者
论文摘要
我们结合了脱落的O型黯然失色的二进制OGEL-LMC-ECL-06782的NLTE光谱分析与径向速度曲线和光曲线的分析，以测量与LMC的独立距离。在我们的光谱分析中，我们研究了正交时系统的复合光谱，并使用径向速度和光曲线的信息，涉及出现恒星重力，半径和组件通量比与得出有效温度，红色，灭绝，灭绝和内在表面亮度的信息。我们获得了M -M = 18.53 +/- 0.04 mag的LMC的距离模量。该值比最近从对二线隔离的大量较长的晚期光谱型二进制二进制的大量样本中获得的精度距离大0.05 mag，但在不确定性范围内同意。我们还确定了系统组件的表面亮度，并与已发表的表面亮度颜色关系找到良好的一致性。基于梅萨恒星进化代码的恒星进化的预测，观察到的恒星参数的比较显示出合理的一致性，但需要减少内部角动量传输以匹配观察到的旋转速度。
We combine the NLTE spectral analysis of the detached O-type eclipsing binary OGLE-LMC-ECL-06782 with the analysis of the radial velocity curve and light curve to measure an independent distance to the LMC. In our spectral analysis we study composite spectra of the system at quadrature and use the information from radial velocity and light curve about stellar gravities, radii and component flux ratio to derive effective temperature, reddening, extinction and intrinsic surface brightness. We obtain a distance modulus to the LMC of m - M = 18.53 +/- 0.04 mag. This value is 0.05 mag larger than the precision distance obtained recently from the analysis of a large sample of detached, long period late spectral type eclipsing binaries but agrees within the margin of the uncertainties. We also determine the surface brightnesses of the system components and find good agreement with the published surface brightness color relationship. A comparison of the observed stellar parameters with the prediction of stellar evolution based on the MESA stellar evolution code shows reasonable agreement, but requires a reduction of the internal angular momentum transport to match the observed rotational velocities.
