Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K-dwarf Binaries and Other Stars
Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K-dwarf Binaries and Other Stars
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DOI：
10.3847/1538-3881/abf9a8
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
E. Horch;Kyle G. Broderick;D. Casetti-Dinescu;T. Henry;F. Fekel;M. Muterspaugh;D. Willmarth;J. Wi
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文献类型：
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作者：
E. Horch;Kyle G. Broderick;D. Casetti-Dinescu;T. Henry;F. Fekel;M. Muterspaugh;D. Willmarth;J. Wi
本文详细介绍了2016年1月至2019年9月期间洛厄尔发现望远镜，WIYN望远镜和双子座望远镜拍摄的双星斑点观测。在双子座和洛厄尔进行的观测是用差分散斑巡天仪（DSSI）进行的，而在WIYN进行的观测是用该站点的差分散斑巡天仪的后继仪器--NN-EXPLORE系外行星星星和散斑成像仪（NESSI）进行的。我们总共给出了178个系统的378个观测数据，结果表明，组合数据集的测量精度的不确定度在间隔上为10.2 mas，位置角上为10.1 °-2°，视间隔而定，星等差上为10.1 mag。这些新结果与文献中已有的数据一起，首次计算出25个可见轨道和一个光谱可见轨道。在对三元星星HD 173093进行光谱-视觉分析的情况下，我们计算出该系统中所有三颗恒星的质量，精度优于1%。在计算出的21个视轨中，K矮星是主星星星;我们将这些视轨加入到已知的K矮星主星轨道中，并讨论了这些恒星在这个阶段的基本轨道性质。虽然不完整，但现有的数据表明，具有K矮星主色的双星在一个到几十个天文单位的距离上，即在太阳系尺度上，往往没有低偏心率轨道。
This paper details speckle observations of binary stars taken at the Lowell Discovery Telescope, the WIYN telescope, and the Gemini telescopes between 2016 January and 2019 September. The observations taken at Gemini and Lowell were done with the Differential Speckle Survey Instrument (DSSI), and those done at WIYN were taken with the successor instrument to DSSI at that site, the NN-EXPLORE Exoplanet Star and Speckle Imager (NESSI). In total, we present 378 observations of 178 systems, and we show that the uncertainty in the measurement precision for the combined data set is ∼2 mas in separation, ∼1°–2° in position angle depending on the separation, and ∼0.1 mag in magnitude difference. Together with data already in the literature, these new results permit 25 visual orbits and one spectroscopic-visual orbit to be calculated for the first time. In the case of the spectroscopic-visual analysis, which is done on the ternary star HD 173093, we calculate masses with a precision of better than 1% for all three stars in that system. Twenty-one of the visual orbits calculated have a K dwarf as the primary star; we add these to the known orbits of K-dwarf primary stars and discuss the basic orbital properties of these stars at this stage. Although incomplete, the data that exist so far indicate that binaries with K-dwarf primaries tend not to have low-eccentricity orbits at separations of one to a few tens of astronomical units, that is, on solar system scales.