色球活动双星CF Tuc的再研究
The chromospherically--active binary CF Tuc revisited
摘要：
在Mt.拍摄的色球活跃二元系统CF Tuc的新高分辨率光谱。约翰大学天文台在2007年，使用两种方法进行了分析：互相关和傅立叶-基于解纠缠。得到了新的径向速度曲线。CF Tuc的轨道根数为：$a_{1}{\sin}i$ = $0.0254\pm0.0001$ AU，$a_{2}{\sin}i$ = $0.0228\pm0.0001$ AU，$M_{1}{\sin}i$ = $0.902\pm0.005$ $M_{\odot}$，$M_{2}{\sin}i$ = $1.008\pm0.006$ $M_{\odot}$。系统的冷却器组件显示H $α$和CaII H & K排放。我们的光谱数据和最近的$BV$光变曲线同时使用Wilson-Devinney代码解决。在较冷的组件的表面上的暗点被假定为解释在光变曲线中观察到的大的不对称性。测定组分的以下绝对参数：$M_{1}$ = $1.11\pm0.01$ $M_{\odot}$，$M_{2}$ = $1.23\pm0.01$ $M_{\odot}$，$R_{1}$ = $1.63\pm0.02$ $R_{\odot}$，$R_{2}$ = $3.60\pm0.02$ $R_{\odot}$，$L_{1}$ = $3.32\pm0.51$ $L_{\odot}$和$L_{2}$ = $3.91\pm0.84$ $L_{\odot}$。利用O-C分析研究了系统的轨道周期。O-C图可以解释为两个突变或叠加在向下抛物线上的准正弦形式。这些变化进行了讨论的质量转移和质量损失，Applegate机制和光的时间效应，由于存在一个大规模的第三机构（可能是一个黑洞）在系统中的组合效应。从动态视差计算出的到CF Tuc的距离为$89\pm6$ pc，忽略星际吸收，与依巴谷值一致。
英文摘要：
New high-resolution spectra, of the chromospherically active binary system CF Tuc, taken at the Mt. John University Observatory in 2007, were analyzed using two methods: cross-correlation and Fourier--based disentangling. As a result, new radial velocity curves of both components were obtained. The resulting orbital elements of CF Tuc are: $a_{1}{\sin}i$=$0.0254\pm0.0001$ AU, $a_{2}{\sin}i$=$0.0228\pm0.0001$ AU, $M_{1}{\sin}i$=$0.902\pm0.005$ $M_{\odot}$, and $M_{2}{\sin}i$=$1.008\pm0.006$ $M_{\odot}$. The cooler component of the system shows H$α$ and CaII H & K emissions. Our spectroscopic data and recent $BV$ light curves were solved simultaneously using the Wilson-Devinney code. A dark spot on the surface of the cooler component was assumed to explain large asymmetries observed in the light curves. The following absolute parameters of the components were determined: $M_{1}$=$1.11\pm0.01$ $M_{\odot}$, $M_{2}$=$1.23\pm0.01$ $M_{\odot}$, $R_{1}$=$1.63\pm0.02$ $R_{\odot}$, $R_{2}$=$3.60\pm0.02$ $R_{\odot}$, $L_{1}$=$3.32\pm0.51$ $L_{\odot}$ and $L_{2}$=$3.91\pm0.84$ $L_{\odot}$. The orbital period of the system was studied using the O-C analysis. The O-C diagram could be interpreted in terms of either two abrupt changes or a quasi-sinusoidal form superimposed on a downward parabola. These variations are discussed by reference to the combined effect of mass transfer and mass loss, the Applegate mechanism and also a light-time effect due to the existence of a massive third body (possibly a black hole) in the system. The distance to CF Tuc was calculated to be $89\pm6$ pc from the dynamic parallax, neglecting interstellar absorption, in agreement with the Hipparcos value.
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