Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43M ⊙, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae* * Based on observations collected at the European Southern Observatory, Chile, Program ID 111.24UP.001.

Research notes of the AAS Pub Date : 2024-08-22 DOI:10.3847/2515-5172/ad713a

Idel Waisberg, Ygal Klein, Boaz Katz

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Abstract

Lambda Muscae is a nearby A-type star reported as a P = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16M _⊙ M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE. Based on a K band flux ratio upper limit of 1% from a VLTI/GRAVITY interferometric observation, we estimate a primary mass M _Aa = 2.28M _⊙ and infer that the closer companion is a M _Ab = 0.43M _⊙ star (almost certainly an M dwarf) orbiting at a = 1.65 au. The triple system might be dynamically interesting given the low hierarchy and the ratio of angular momenta of the inner and outer orbits of about one.

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中质量恒星的隐藏伴星。XXII.推断三星系 Lambda Muscae 中的天体测量双星中有一颗 0.43M ⊙, 1.65 au 伴星* * 基于智利欧洲南方天文台的观测数据，计划编号 111.24UP.001。

Lambda Muscae是一颗附近的A型恒星，在Gaia DR3（以及之前的Hipparcos）中被报告为一颗P=474天的天体测量双星，VLT/SPHERE还发现了它的一个0.16M⊙M矮伴星，预计距离为6.4au。根据VLTI/GRAVITY干涉测量观测得出的1%的K波段通量比上限，我们估计主星质量为MAa = 2.28M⊙，并推断距离较近的伴星是一颗MAb = 0.43M⊙的恒星（几乎可以肯定是一颗M矮星），其轨道位于a = 1.65 au处。由于层次结构较低，而且内外轨道的角矩比约为 1，因此这个三重系统可能具有很强的动力学意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Research notes of the AAS

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