论文标题
praesepe中的干涉二进制二进制Epsilon Cancri：精确的质量和年龄
The Interferometric Binary Epsilon Cancri in Praesepe: Precise Masses and Age
论文作者
论文摘要
我们观察到Praesepe簇中最亮的成员Epsilon Cancri，以精确测量该二进制系统中恒星的特征，以实现群集年龄的新测量。我们提出了光谱径向速度测量值和天空投影轨道的干涉测量值，以得出质量，我们认为这是M_1/M_SUN = 2.420 +/- 0.008和M_2/M_SUN和M_2/M_SUN = 2.226 +/- 0.004。我们通过使用光谱和干涉光度比率在恒星的颜色稳定位置上放置限制，同时试图再现Epsilon Cancri的光谱能分布。我们使用GAIA数据和文献径向速度信息在颜色磁性图的明亮末端重新检查恒星的聚类成员。根据雾模型的同句确定，二元星数据与637 +/- 19 MYR一致。恒星的质量和亮度似乎选择了最常用的对流核心过冲的模型。
We observe the brightest member of the Praesepe cluster, Epsilon Cancri, to precisely measure the characteristics of the stars in this binary system, en route to a new measurement of the cluster's age. We present spectroscopic radial velocity measurements and interferometric observations of the sky-projected orbit to derive the masses, which we find to be M_1/M_sun = 2.420 +/- 0.008 and M_2/M_sun = 2.226 +/- 0.004. We place limits on the color-magnitude positions of the stars by using spectroscopic and interferometric luminosity ratios while trying to reproduce the spectral energy distribution of Epsilon Cancri. We re-examine the cluster membership of stars at the bright end of the color-magnitude diagram using Gaia data and literature radial velocity information. The binary star data are consistent with an age of 637 +/- 19 Myr, as determined from MIST model isochrones. The masses and luminosities of the stars appear to select models with the most commonly used amount of convective core overshooting.
