船底座食双星的光变曲线模拟
Light curve modeling of eclipsing binaries towards the constellation of Carina
摘要：
我们使用Pietrukowicz等人（2009）使用欧洲南方天文台直径8米的甚大望远镜（ESO VLT）收集的数据，对30个食双星进行了详细的V波段光度光变曲线建模。这30个食双星的光变曲线是从数据库中的148个双星中选出的，它们的光变曲线具有完整的相位覆盖、规则和平滑的相位光变曲线形状。双星在直接测量天文距离方面起着关键作用，更精确地从它们的光变曲线几何学出发。测量宇宙膨胀率的哈勃常数（H 0）的精确值严重依赖于河外距离尺度的测量。首先根据a2-a4平面的傅立叶参数对样本中的双星进行了分类，最后根据洛希叶几何对样本中的双星进行了分类。在这30颗食双星中，只有一颗是分离双星系统，其余29颗都是接触双星系统。根据它们的质量比，这些接触双星被进一步分为A型和W型。由于光谱质量比的测量是不可用的任何这些双星，我们确定了质量比通过光度的光变曲线建模与威尔逊-Devinney代码的帮助下实施的PHOEBE。具有天体物理重要性的各种几何参数和物理参数，即，从选定恒星的光变曲线中获得质量，半径和光度。
英文摘要：
We present a detailed V-band photometric light curve modeling of 30 eclipsing binaries using the data from Pietrukowicz et al. (2009) collected with the European Southern Observatory Very Large Telescope (ESO VLT) of diameter 8-m. The light curve of these 30 eclipsing binaries were selected out of 148 of them available in the database on the basis of complete phase coverage, regular and smooth phased light curve shapes. Eclipsing binaries play pivotal role in the direct measurement of astronomical distances more accurately simply from their geometry of light curves. The accurate value of Hubble constant (H0) which measures the rate of expansion of the Universe heavily relies on extragalactic distance scale measurements. Classification of the selected binary stars in the sample were done, preliminarily on the basis of Fourier parameters in the a2-a4 plane and final classification was obtained from the Roche lobe geometry. Out of these 30 eclipsing binaries, only one was found to be detached binary system while the rest 29 of them belong to the contact binary systems. These contact binaries were further classified into the A-type and W-type based on their mass ratios. Since spectroscopic mass ratio measurements were not available for any of these binary stars, we determined the mass ratios through photometric light curve modeling with the aid of Wilson-Devinney code as implemented in PHOEBE. Various geometrical parameters and physical parameters of astrophysical importance viz., mass, radius and luminosity were obtained from the light curves of the selected stars.
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