年轻双星Haro 1- 14 c的初步轨道
Preliminary Orbit of the Young Binary Haro 1-14c
摘要：
利用凯克干涉仪，我们空间解决了前主序星双星，哈罗1- 14 c的轨道，为第一次。我们提出了这些干涉观测以及额外的光谱径向速度测量的组件。我们对Haro 1- 14 c的干涉仪视速度和径向速度进行了同步轨道拟合。根据对符合数据的可能轨道解的统计分析，我们确定了主星和副星的质量分别为M_1 = 0.96（+0.27/-0.08）Msun和M_2 = 0.33（+0.09/-0.02）Msun，到系统的距离为111（+19/-18）pc。距离测量与蛇夫座分子云的近距离估计是一致的。将我们的结果与进化轨迹进行比较，表明Haro 1- 14 c的年龄为3-4百万年。通过额外的干涉测量来改善质量和距离的不确定性，我们期望低质量次级恒星为校准前主序星的理论演化轨道提供重要的经验数据。
英文摘要：
Using the Keck Interferometer, we spatially resolved the orbit of the pre-main sequence binary, Haro 1-14c, for the first time. We present these interferometric observations along with additional spectroscopic radial velocity measurements of the components. We performed a simultaneous orbit fit to the interferometric visibilities and the radial velocities of Haro 1-14c. Based on a statistical analysis of the possible orbital solutions that fit the data, we determined component masses of M_1 = 0.96 (+0.27/-0.08) Msun and M_2 = 0.33 (+0.09/-0.02) Msun for the primary and secondary, respectively, and a distance to the system of 111 (+19/-18) pc. The distance measurement is consistent with the close distance estimates of the Ophiuchus molecular cloud. Comparing our results with evolutionary tracks suggests an age of 3-4 Myr for Haro 1-14c. With additional interferometric measurements to improve the uncertainties in the masses and distance, we expect the low-mass secondary to provide important empirical data for calibrating the theoretical evolutionary tracks for pre-main sequence stars.
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