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American Astronomical Society, Research Notes of the American Astronomical Society, 2(8), p. 42, 2024

DOI: 10.3847/2515-5172/ad25eb

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Hidden Companions to Intermediate-mass Stars. XV. Discovery of a 1.2M <sub>⊙</sub>, 8.4 au Companion to the δ Scuti star HIP 41375 = 2 Hydrae*

Journal article published in 2024 by Idel Waisberg ORCID, Ygal Klein ORCID, Boaz Katz ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract 2 Hydrae is a nearby M Aa = 1.66M ⊙ δ Scuti star with strong astrometric evidence for a close companion in addition to its known M B = 0.20M ⊙ M dwarf companion at 530 au. Here we report on a VLTI/GRAVITY near-infrared interferometric observation that reveals the close companion to be a M Ab = 1.18M ⊙ star at a projected separation ρ = 168 mas ↔ 8.4 au. This triple system is a potential progenitor for a double white dwarf binary under the dynamical influence of an outer M dwarf companion with a low enough hierarchy for potentially interesting dynamical effects.