论文标题
DEB SB2二进制系统J064726.39+223431.6的基本参数
Fundamental parameters for dEB SB2 binary system J064726.39+223431.6
论文作者
论文摘要
我们介绍了使用Lamost-MRS和TESS光度法的光谱进行黯然失色的二进制J064726.39+223431.6的研究。我们使用全光谱拟合来得出径向速度和频谱参数：$ {t _ {\ rm eff}} _ {a {a，b} = 6177，\，5820 $ k，$ k，$ v \ sin {i} _} _ {i} _ {a，b} [fe/h]} _ {a，b} = -0.19 $ dex。轨道溶液和光曲线分析表明，它是圆形轨道上的一对快速旋转的恒星。我们测量他们的质量为$ m_ {a，b} = 1.307 \ pm0.007，\，1.129 \ pm0.005 \，m_ \ odot $及其radii及其radii为$ r_ {a，b} = 1.405 \ pm0.052，\ pm052，\，1.219 \ pM0.0.0.0.0.0.0.06060 \ $ \ log {g} _ {a，b} = 4.259 \ pm0.033，\，4.319 \ pm0.042 $（cgs）。理论模型无法匹配所有这些属性，对于给定的金属度，预测$ {t _ {\ rm eff}} $更高。系统的衍生年龄1.56 GYR表明两个组件都比太阳年轻，这与轨道的圆形化时间尺度相矛盾。
We present a study of eclipsing binary J064726.39+223431.6 using spectra from the LAMOST-MRS and TESS photometry. We use full-spectrum fitting to derive radial velocities and spectral parameters: ${T_{\rm eff}}_{A,B}=6177,\,5820$ K, $v \sin{i}_{A,B}=59,\,50~\kms$ and ${\rm [Fe/H]}_{A,B}=-0.19$ dex. The orbital solution and light curve analysis suggest that it is a close pair of fast rotating stars on circular orbit. We measure their masses to be $M_{A,B}=1.307\pm0.007,\, 1.129\pm0.005\,M_\odot$ and their radii to be $R_{A,B}=1.405\pm0.052,\, 1.219\pm0.060\,R_\odot$ resulting in surface gravities of $\log{g}_{A,B}=4.259\pm0.033,\,4.319\pm0.042$ (cgs). Theoretical models cannot match all of these properties, predicting significantly higher ${T_{\rm eff}}$ for a given metallicity. Derived age of the system 1.56 Gyr indicates that both components are younger than Sun, which contradicts to much longer orbit's circularisation timescale.
