AI 中文总结
利用CHARA阵列及两台望远镜的观测数据，测定两颗长周期分光双星的轨道、质量等参数，为恒星演化模型检验提供更优的单恒星代理。
AI 中文摘要
我们利用CHARA阵列的长基线干涉测量技术，以及APO 3.5米望远镜和CTIO 1.5米望远镜的高分辨率光谱学数据，给出了两颗长周期分光双星HD 210763和HD 221950的视觉轨道与动力学质量。通过结合天体测量和视向速度观测，我们求解了完整的三维轨道，并将恒星质量的不确定度控制在0.5%以内，距离的不确定度控制在0.2%以内。对于HD 210763，我们测得其子星质量为M1 = 1.748倍太阳质量（Msun），M2 = 1.492 Msun；对于HD 221950，测得子星质量为M1 = 1.098 Msun，M2 = 1.031 Msun。随后，我们通过光谱分解和光谱能量分布分析估算了每颗子星的有效温度与半径，并将观测到的恒星参数与恒星演化模型的预测结果进行对比，估算了系统年龄。HD 210763的主序星已处于主序星阶段末期，伴星则处于主序星阶段，这为该系统提供了严格的年龄约束，年龄为1.6 Gyr；HD 221950的两颗子星均仍处于主序星阶段，年龄为3.76 Gyr。这些系统具有更长的轨道周期，超过了潮汐圆化极限，因此相比短周期食双星，它们是更优的单恒星代理，也更适合用于恒星演化模型的检验。
英文摘要
We present the visual orbits and dynamical masses of two longer period spectroscopic binary stars, HD 210763 and HD 221950, using long baseline interferometry with the CHARA Array and high resolution spectroscopy with the APO 3.5 m and CTIO 1.5 m telescopes. By combining the astrometric and radial velocity observations, we solve for the full, three-dimensional orbits and determine the stellar masses to within 0.5% uncertainty and the distance to within 0.2% uncertainty. For HD 210763, we found component masses of M1 = 1.748 Msun and M2 = 1.492 Msun. For HD 221950, we found masses of M1 = 1.098 Msun and M2 = 1.031 Msun. We then estimate the effective temperature and radius of each component star through disentangling and spectral energy distribution analyses. We compare the observed stellar parameters to the predictions of the stellar evolution models and estimate the system ages. The primary component of HD 210763 is at the end of the main sequence while the secondary component is on the main sequence, providing a tight age constraint for this system at 1.6 Gyr. Both components of HD 221950 are still on the main sequence with an age of 3.76 Gyr. These systems have longer orbital periods, beyond the tidal circularization limit, and therefore are better proxies for single stars and tests of stellar evolution models than short period, eclipsing systems.
Comments15 pages. Accepted to AJ
