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2025RNAAS...9....1W - Research Notes of the AAS, 9, 1 (2025/January-0)

Hidden Companions to Intermediate-mass Stars. Upgraded Multiplicity 3 → 4. XXIV. Discovery of a 0.70 M⊙, 0.06 au Companion to Upsilon Ophiuchi Ab (Plus Discovery of the υ Oph Mini-cluster).

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

Upsilon Ophiuchi is a nearby 30 au visual binary. The primary (Aa) is a known close spectroscopic binary. Here we report on a VLTI/GRAVITY interferometric observation which revealed that the visual secondary (Ab) is also a close binary (ρ = 1.5 mas ↔ 0.06 au). The primary was also spatially resolved as a ρ = 10.90 mas binary, confirming υ Oph as a 2+2 quadruple. We estimate masses MAa1 = 1.83M⊙, MAa2 = 1.47M⊙, MAb1 = 0.82M⊙and MAb2 = 0.70M⊙and a system age of 50 Myr. We find that there are six stars within 5° ↔ 3.5 pc of υ Oph that share parallaxes and proper motions with it, suggesting that they form a mini-cluster of only about 8M⊙ in total mass.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Multiple stars - A stars - Optical interferometry - Star clusters

Simbad objects: 7

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