AI 中文总结
本文介绍对太阳18秒差距内2047颗恒星的高角分辨率巡天，通过斑点成像观测1208颗恒星，并证明基于盖亚双星指示参数选目标会遗漏大量双星，为无偏巡天提供依据。
AI 中文摘要
我们介绍了一项对太阳18秒差距内恒星进行高角分辨率成像巡天的原理、设计、方法和观测设施。我们的综合样本由来自盖亚eDR3及补充星表的2047颗恒星组成。主要目标是在考虑固有局限性的前提下，尽可能多地利用高角分辨率技术观测该样本中的恒星，对已知双星系统进行天体测量，并为每颗被观测恒星确定伴星成分的探测极限。这种方法还可能使我们识别出先前未分辨的恒星伴星。观测使用北半球OAN-SPM的2.1米望远镜和南半球3.58米NTT望远镜进行，采用高速相机进行斑点成像。我们在OAN-SPM获得了703颗V<14星等的恒星观测，在NTT获得了645颗I<16星等的恒星观测，其中140颗恒星在两个半球均被观测，总计观测到1208颗独立恒星。在本文中：（1）我们介绍了18秒差距内2047颗恒星星表的构建；（2）利用18秒差距内70个已知分离度<1角秒的密近双星作为对照样本，我们表明，基于盖亚质量参数（通常用作双星指示器）——RUWE、ipd_frac_odd_win和ipd_frac_multi_peak——来选择目标可能会遗漏相当大比例的双星，这证明了我们无偏、体积受限巡天的合理性；（3）我们展示了2022年7月使用OAN-SPM 2.1米望远镜进行的先导观测结果。完整样本的全面分析将在后续论文中呈现。
英文摘要
We present the rationale, design, methodology, and observational facilities of a high-angular-resolution imaging survey of stars within 18~pc of the Sun. Our comprehensive sample consists of 2047 stars compiled from Gaia eDR3 and complementary catalogs. The main goal is to observe as many stars from this sample as possible using high-angular-resolution techniques, considering their inherent limitations, to perform astrometry of known binary systems and determine detection limits for secondary components for each observed star. This approach may also allows us to identify previously unresolved stellar companions. Observations were carried out using the 2.1-m telescope at OAN-SPM in the North and the 3.58-m NTT in the South, employing high-speed cameras for speckle imaging. We obtained observations of 703 stars with V < 14 mag at OAN-SPM, and 645 stars with I < 16 mag at the NTT, of which 140 stars were observed in both hemispheres, for a total of 1208 unique stars observed. In this paper: (1) we present the construction of the catalog of 2047 stars within 18 pc; (2) using a control sample of 70 known close binaries within 18 pc with separations 1", we show that selecting targets based on Gaia quality parameters commonly used as binarity indicators--RUWE, ipd_frac_odd_win, and ipd_frac_multi_peak--can miss a significant fraction of binaries, justifying our unbiased, volume-limited survey; and (3) we present the results of pilot observations conducted with the 2.1 m telescope at OAN-SPM in July 2022. A full analysis of the complete sample will be presented in of forthcoming papers.
CommentsAccepted for publication in Revista Mexicana de Astronomía y Astrofísica. 20 pages, 10 figures and 5 tables
