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arXiv 0905.0457astro-ph.SR
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三个双线双星的光谱轨道:I。BG单个、IM周一、RS Sgr

The Spectroscopic Orbits of Three Double-lined Eclipsing Binaries: I. BG Ind, IM Mon, RS Sgr

V. Bakis, H. Bakis, S. Bilir, F. Soydugan, E. Soydugan, O. Demircan, Z. Eker, E. Yaz, M. Tuysuz, T. Senyuz

摘要:

本文给出了三个双线食双星BG Ind、IM Mon和RS Sgr的光谱轨道解。第一个精确的径向速度(RV)的组件确定使用高分辨率阶梯光谱获得的山。新西兰约翰大学天文台。BG Ind和RS Sgr的分量的RV使用高斯拟合到所选择的谱线来测量,而二维互相关技术优选用于确定IM Mon的RV,因为它在其他目标中具有相对短的轨道周期,因此谱线的混合更有效。对于所有系统,在分析期间使用开普勒轨道解,并且还采用圆形轨道,因为发现所有目标的偏心率可以忽略不计。对这些系统的第一次精确轨道分析给出了BG Ind、IM Mon和RS Sgr系统的质量比分别为0.894、0.606和0.325。通过对系统各组成部分的质量比值、轨道大小和最小质量的比较,可以看出,所有系统都应该具有不同的物理、动力和可能的演化状态。

英文摘要:

We present the spectroscopic orbit solutions of three double-lines eclipsing binaries, BG Ind, IM Mon and RS Sgr. The first precise radial velocities (RVs) of the components were determined using high resolution echelle spectra obtained at Mt. John University Observatory in New Zealand. The RVs of the components of BG Ind and RS Sgr were measured using Gaussian fittings to the selected spectral lines, whereas two-dimensional cross-correlation technique was preferred to determine the RVs of IM Mon since it has relatively short orbital period among the other targets and so blending of the lines is more effective. For all systems, the Keplerian orbital solution was used during the analysis and also circular orbit was adopted because the eccentricities for all targets were found to be negligible. The first precise orbit analysis of these systems gives the mass ratios of the systems as 0.894, 0.606 and 0.325, respectively for BG Ind, IM Mon and RS Sgr. Comparison of the mass ratio values, orbital sizes and minimum masses of the components of the systems indicates that all systems should have different physical, dynamical and probable evolutionary status.

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