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2023RNAAS...7..103W - Research Notes of the AAS, 7, 103 (2023/May-0)

Hidden Companions to Intermediate-mass Stars. IV. Uncovering a 1.1 M⊙, 1.3 au Companion in the Astrometric Binary HIP 77541.

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

There are many Hipparcos/Gaia astrometric binaries for which the nature of the companion is not known. Optical/near-infrared inteferometry is arguably the most efficient method to unambiguously identify such companions. Here we report on a VLTI/GRAVITY observation in which we detected a companion to the nearby astrometric binary HIP 77541 with a K band flux ratio of 20% at a projected separation ρ = 18 mas ↔ 1.3 au. The resulting isochrone masses 2.0 + 1.1M⊙ imply that HIP 77541 is a potential progenitor for a close white dwarf binary within a Hubble time.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Multiple stars - A stars - Astrometric binary stars - Optical interferometry

Simbad objects: 2

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