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Published in

American Astronomical Society, Research Notes of the American Astronomical Society, 6(7), p. 125, 2023

DOI: 10.3847/2515-5172/acdee6

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Hidden Companions to Intermediate-mass Stars. VI. Discovery of a 0.50M <sub>⊙</sub>, 6 au Companion to HIP 74696*

Journal article published in 2023 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 A-type stars with a large long-term proper motion change and without a known companion to cause it are candidates for being Sirius analogues. However, in most cases the culprit is expected to be a hitherto unknown low mass companion rather than a white dwarf. Here we report the discovery of a 0.50M companion to the nearby 1.64M star HIP 74696 at a projected separation ρ = 118.9 mas ↔ 6.2 au based on a VLTI/GRAVITY observation. This companion explains the Gaia–Hipparcos proper motion change of the primary. Together with the wide 660 au companion that was found by Gaia DR3 to be a 0.70M + 0.20M 1.5 au binary, this makes HIP 74696 a quadruple and part of the growing class of high multiplicity systems with an A-type star primary.