用Robo-AO对25 pc以内的北星伴星进行自适应光学普查
An Adaptive Optics Census of Companions to Northern Stars Within 25 pc with Robo-AO
摘要：
为了在有限的样本中评估不同光谱类型和种群的恒星的多重性统计，我们用Robo-AO普查了附近的恒星。我们用decl观测了1157颗在25秒差距内的所有光谱类型的恒星。$>-13^{\circ}$寻找亲密的伙伴。我们检测到154同伴候选人的分离范围从$\sim$ 0.15 $''$到4.0 $''$和幅度差异高达$Δ$ m $_{\textit{i'}}\le$ 7使用机器人自适应光学仪器Robo-AO。我们从盖亚EDR 3天体测量中确认了53个伴星候选者的物理关联，99个有待确认，2个被排除为背景物体。我们补充了高分辨率成像伴侣搜索，在盖亚EDR 3中搜索了分离到10，000 AU的共同移动物体，这导致了额外的147个伴侣注册。在这项研究报告的301个同伴中，有49个是新发现的。在依巴谷-盖亚加速度目录中具有显著加速度测量值的191颗恒星中，我们在其中115颗周围检测到同伴，随着同伴分离的减少，加速度的重要性增加。从这次调查中，我们报告了以下多重分数（与文献值相比）：FGK型星为40.9% $\pm$ 3.0%（44%），M型星为28.2% $\pm$ 2.3%（27%），FGK型星和M型星的高阶分数分别为5.5% $\pm$ 1.1%（11%）和3.9% $\pm$ 0.9%（5%），分别
英文摘要：
In order to assess the multiplicity statistics of stars across spectral types and populations in a volume-limited sample, we censused nearby stars for companions with Robo-AO. We report on observations of 1157 stars of all spectral types within 25 pc with decl. $>-13^{\circ}$ searching for tight companions. We detected 154 companion candidates with separations ranging from $\sim$0.15$''$ to 4.0$''$ and magnitude differences up to $Δ$m$_{\textit{i'}}\le$7 using the robotic adaptive optics instrument Robo-AO. We confirmed physical association from Gaia EDR3 astrometry for 53 of the companion candidates, 99 remain to be confirmed, and 2 were ruled out as background objects. We complemented the high-resolution imaging companion search with a search for co-moving objects with separations out to 10,000 AU in Gaia EDR3, which resulted in an additional 147 companions registered. Of the 301 total companions reported in this study, 49 of them are new discoveries. Out of the 191 stars with significant acceleration measurements in the Hipparcos-Gaia catalog of accelerations, we detect companions around 115 of them, with the significance of the acceleration increasing as the companion separation decreases. From this survey, we report the following multiplicity fractions (compared to literature values): 40.9%$\pm$3.0% (44%) for FGK stars and 28.2%$\pm$2.3% (27%) for M stars, as well as higher-order fractions of 5.5%$\pm$1.1% (11%) and 3.9%$\pm$0.9% (5%) for FGK stars and M type stars, respectively.
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