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外文期刊>The Astrophysical journal
>ORBIT DETERMINATION OF DOUBLE-LINED SPECTROSCOPIC BINARIES BY FITTING THE REVISED HIPPARCOS INTERMEDIATE ASTROMETRIC DATA
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ORBIT DETERMINATION OF DOUBLE-LINED SPECTROSCOPIC BINARIES BY FITTING THE REVISED HIPPARCOS INTERMEDIATE ASTROMETRIC DATA
Untill now, the Hipparcos intermediate astrometric data (HIAD) have contributed little to the full orbit determination of double-lined spectroscopic binaries (SB2s). This is because the photocenter of such a binary system is usually not far from the system mass center, and its orbital wobble is generally weak with respect to the accuracy of the HIAD. However, the HIAD have been recently revised and the accuracy is increased by a factor of 2.2 in the total weight. Therefore, it is interesting to see if the revised HIAD can be used in the orbit determination at least for some SB2s. In this paper, we first search the 9th Catalogue of Orbits of Spectroscopic Binaries (S B 9 ) for SB2s with reliable spectroscopic orbital solutions and with periods between 50 days and 3.2 years. This leaves us with 56 systems. The full orbital solutions of these systems are then determined from the HIAD by a highly efficient grid search method developed in this paper. The high efficiency is achieved by reducing the number of nonlinear model parameters to one, and by allowing all parameters to be adjustable within a region centered at each grid point. After a variety of tests, we finally accept orbital solutions of 13 systems. Among these systems, six (HIP 677, 20894, 87895, 95995, 101382, and 111170) are well resolved with reliable interferometric data. Orbital solutions from these data are consistent with our results. The full orbital solutions of the other seven systems (HIP 9121, 17732, 32040, 57029, 76006, 102431, and 116360) are determined for the first time.
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机译：到目前为止，Hipparcos中间天文数据（HIAD）对双线光谱双星（SB2s）的全轨道确定几乎没有贡献。这是因为这样的二元系统的光心通常离系统质量中心不远，并且相对于HIAD的精度，其轨道摆动通常较弱。但是，HIAD最近进行了修订，其精度在总重量中提高了2.2倍。因此，有趣的是，至少在某些SB2上，是否可以将修订后的HIAD用于轨道确定。在本文中，我们首先在第9光谱双星轨道目录（S B 9）中搜索了具有可靠的光谱轨道解并且周期为50天至3.2年的SB2。这给我们留下了56个系统。然后，通过本文开发的高效网格搜索方法，从HIAD确定这些系统的完整轨道解。通过将非线性模型参数的数量减少到一个，并通过在以每个网格点为中心的区域内调整所有参数，可以实现高效率。经过各种测试，我们最终接受了13个系统的轨道解决方案。在这些系统中，六个（HIP 677、20894、87895、99595、101382和111170）已通过可靠的干涉数据得到了很好的解析。这些数据的轨道解与我们的结果一致。首次确定其他七个系统（HIP 9121、17732、32040、57029、76006、102431和116360）的完整轨道解。
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