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| Query : 2025RNAAS...9....1W |
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
| Number of rows : 7 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | HD 144660 | PM* | 16 07 21.2319469248 | -08 10 10.904876688 | 10.108 | 9.516 | 9.594 | K1V | 22 | 0 | ||
| 2 | Gaia DR3 4344744287631877632 | PM* | 16 25 50.0090998500 | -09 09 58.664737633 | ~ | 2 | 0 | |||||
| 3 | HD 148300 | PM* | 16 27 28.9135359144 | -08 34 19.162198776 | 9.57 | 8.76 | K0V | 17 | 0 | |||
| 4 | * ups Oph | SB* | 16 27 48.1733121458 | -08 22 18.415622756 | 4.80 | 4.63 | kA2hA5VmA5 | 144 | 0 | |||
| 5 | HD 149383 | * | 16 34 33.7080528120 | -08 08 57.624122724 | 9.30 | 7.63 | K3III | 13 | 0 | |||
| 6 | BD-05 4325A | PM* | 16 37 32.2871592984 | -05 30 18.163847304 | 10.276 | K7V | 9 | 0 | ||||
| 7 | Gaia DR3 4337421986866681728 | PM* | 16 41 07.9019792514 | -10 18 47.809583098 | ~ | 2 | 0 |
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