We have detected the secondary component in two previously known spectroscopic binaries, HD?434 and 41?Sex, and for the first time determined double-lined orbits for them. Despite the relatively long period of 34.26?days and a moderate eccentricity of 0.32, combined with the components' rotationally broadened lines, measurement of the primary and secondary radial velocities of HD?434 has enabled us to obtain significantly improved orbital elements. While the 41?Sex system has a much shorter period of 6.167?days and a circular orbit, the estimated V mag difference of 3.2 between its components also makes this a challenging system. The new orbital dimensions (a 1 sin i and a 2 sin i) and minimum masses (m 1 sin3 i and m 2 sin3 i) of HD?434 have accuracies of 0.8% or better, while the same quantities for 41?Sex are good to 0.5% or better. Both components of HD?434 are Am stars while the Am star primary of 41?Sex has a late-F or early-G companion. All four stars are on the main sequence. The two components of HD?434 are rotating much faster than their predicted pseudosynchronous velocities, while both components of 41?Sex are synchronously rotating. For the primary of 41?Sex, the spectrum line depth changes noted by Sreedhar Rao et?al. were not detected.
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机译：我们已经在两个先前已知的光谱双星HD？434和41？Sex中检测到了次级分量，并首次确定了它们的双线轨道。尽管有34.26天的相对较长的时间和0.32的中等偏心率，再加上部件的旋转加宽线，但对HD？434的一次和二次径向速度的测量使我们获得了明显改善的轨道元件。虽然41？Sex系统的周期短得多，为6.167？days，并且轨道是圆形的，但估计其组件之间的V mag差为3.2，这也使该系统具有挑战性。 HD？434的新轨道尺寸（a 1 sin i和a 2 sin i）和最小质量（m 1 sin3 i和m 2 sin3 i）的精确度为0.8％或更高，而41？Sex的相同质量为达到0.5％或更高。 HD？434的两个组件都是Am星星，而41？Sex的Am星星的原星则有F晚期或G早期伴侣。所有四颗星都在主序上。 HD 434的两个分量的旋转速度快于其预测的伪同步速度，而41性别的两个分量都同步旋转。对于41？Sex的原边，Sreedhar Rao等人注意到了谱线深度的变化。未检测到。
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