论文标题
单层二进制Kappa DRA（B6 IIIE）中初级恒星和次级SDB恒星的动力学质量
Dynamical masses of the primary Be star and the secondary sdB star in the single-lined binary kappa Dra (B6 IIIe)
论文作者
论文摘要
由于许多经典的恒星可能将其性质归功于在近距离二进制中的质量和角度转移，因此与恒星进化模型进行比较，其组分的当前质量，温度和半径具有很高的兴趣。 Kappa DRA是一个为期61.5天的单线二进制，带有B6 IIIE初级。使用Chara Array Instruments MIRC/MIRC-X和Mystic，我们分别在H和K频段中检测到1.49 +-0.10％和1.63 +-0.09％的次级助理磁通率。从大而多样化的光谱数据库中，只能提取BE恒星的径向速度曲线。但是，采用来自河马和盖亚（Gaia）的视差（在其名义1- sigma误差范围内）的视差，我们可以得出总质量，并发现分别为Be Star和同伴的分别为3.65 +-0.48 msun和0.426 +-0.043 msun。先前使用SDO光谱模型模型的FAR-UV光谱的互相关未检测到属于〜20个早期类型的热O-Type Subdwarf（SDO）种群的伴侣。在我们的完整3D轨道解决方案的指导下，我们发现了剥离的B型伴侣（远紫外线的比率为2.3 +-0.5％）的强烈互相关信号，这使得第一个稳定的恒星表征，并使Kappa Dra成为第一个中后期的恒星与直接的spepers compander apeper-obsprever-obsever-obsed compersion comporlion。
Because many classical Be stars may owe their nature to mass and angular-momentum transfer in a close binary, the present masses, temperatures, and radii of their components are of high interest for comparison to stellar evolution models. Kappa Dra is a 61.5-day single-lined binary with a B6 IIIe primary. With the CHARA Array instruments MIRC/MIRC-X and MYSTIC, we detected the secondary at (approximately photospheric) flux ratios of 1.49 +- 0.10% and 1.63 +- 0.09% in the H and K band, respectively. From a large and diverse optical spectroscopic database only the radial velocity curve of the Be star could be extracted. However, employing the parallaxes from Hipparcos and Gaia, which agree within their nominal 1-sigma errors, we could derive the total mass and found component masses of 3.65 +- 0.48 Msun and 0.426 +- 0.043 Msun for the Be star and the companion, respectively. Previous cross-correlation of the observed far-UV spectrum with sdO spectral model templates had not detected a companion belonging to the hot O-type subdwarf (sdO) population known from ~20 earlier-type Be stars. Guided by our full 3D orbital solution, we found a strong cross-correlation signal for a stripped subdwarf B-type companion (far-UV flux ratio of 2.3 +- 0.5%), enabling the first firm characterization of such a star, and making kappa Dra the first mid- to late-type Be star with a directly-observed subdwarf companion.
