论文标题
对最短时期的调查AM类型黯然失色的二进制TYC 6408-989-1
Investigation of the shortest period Am type eclipsing binary TYC 6408-989-1
论文作者
论文摘要
已经获得了第一个BV波段的光度观测和最短周期的低分辨率AM型脱毛二进制TYC 6408-989-1。主要恒星的恒星大气参数是通过频谱拟合获得的：$ t_ {eff} = 6990 \ pm117 k $，$ \ log G = 4.25 \ pm0.26 cm/s^2 $，$ [fe/h]，$ [fe/h] = -0.45 \ pm0.03 dex $。欧洲南方天文台（ESO）获得的原始光谱是由我们处理的IRAF包装。基于ESO蓝色紫色光谱，TYC 6408-989-1被缔结为边缘AM（AM :)恒星，具有通过MKClass程序识别的光谱类型的KA3HF1MA5 IV-V。通过Wilson-Devinney法规分析了观察到的光曲线。最终的光度法溶液表明，TYC 6408-989-1是一个边缘接触二进制的，质量比低（Q = 0.27）。通过光曲线分析得出的次级成分的温度明显高于主序列恒星。此外，TYC 6408-989-1是较差的热接触二进制。两个组件之间的温度差异约为1800K。 TYC 6408-989-1应位于热弛豫振荡理论（TRO）预测的振荡阶段，并最终将发展为浅层接触阶段。很短的时间（不到一天），边际上的特殊性和退出较大的旋转速度（$ v \ sin i \ simeq 160 km s^{ - 1} $）使TYC 6408-989-1成为旋转速度的曲折速度和AM恒星周期的挑战。我们已经收集了众所周知的黯然失色的AM二进制文件，该二进制文件具有文献的绝对参数。
The first BV bands photometric observations and the low-resolution spectrum of the shortest period Am type eclipsing binary TYC 6408-989-1 have been obtained. The stellar atmospheric parameters of the primary star were obtained through the spectral fitting as follows: $T_{eff}=6990\pm117 K$, $\log g=4.25\pm0.26 cm/s^2$, $[Fe/H]=-0.45\pm0.03 dex$. The original spectra obtained by European Southern Observatory (ESO) were processed with IRAF package by us. Based on the ESO blue-violet spectra, TYC 6408-989-1 was concluded as a marginal Am (Am:) star with a spectral type of kA3hF1mA5 IV-V identified through the MKCLASS program. The observed light curves were analyzed through the Wilson-Devinney code. The final photometric solutions show that TYC 6408-989-1 is a marginal contact binary with a low mass ratio (q=0.27). The temperature of the secondary component derived through the light curve analysis is significantly higher than main sequence stars. In addition, TYC 6408-989-1 is a poor thermal contact binary. The temperature differences between the two components is about 1800K. TYC 6408-989-1 should be located in the oscillation stage predicted by the thermal relaxation oscillations theory (TRO) and will evolve into the shallow contact stage eventually. The very short period (less than one day), marginal Am peculiarity and quit large rotational velocity ($v\sin i \simeq 160 km s^{-1}$) make TYC 6408-989-1 became a challenge to the cut-off of rotation velocities and periods of Am stars. We have collected the well known eclipsing Am binaries with absolute parameters from the literature.
