2025RNAAS...9..314W

Query : 2025RNAAS...9..314W

2025RNAAS...9..314W - Research Notes of the AAS, 9, 314 (2025/November-0)

Hidden Companions to Intermediate-mass Stars. Upgraded Multiplicity 3 → 4. XXXII. Discovery of a 1.17M⊙, 0.44 au Companion to e Geminorum A.

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

e Geminorum is a nearby $\rho =7\mathop{.}\limits^{^{\prime\prime} }4\leftrightarrow 220\,\,\rm{au}\,$ visual binary (A+B) that also has a wide ρ = 152″ ↔ 4560 au companion. Here we show that e Gem is actually a quadruple system based on a VLTI/GRAVITY observation: the visual primary is itself a close binary with a K band flux ratio of 31% at a projected separation ρ = 13.46 mas ↔ 0.44 au. Isochrone fitting implies masses MAa ≃ 1.61M⊙ and MAb ≃ 1.17M⊙. Ab can explain the X-ray emission of e Gem A. Nontrivial evolution is expected when Aa fills its Roche lobe as it ascends the red-giant branch in about 5 Gyr.

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

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

Simbad objects: 3

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Number of rows : 3
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 * e Gem PM* 06 54 38.6381476771 +13 10 40.243144636   4.997 4.715     kA8mF0Vp 115 0
2 UPM J0654+1310 PM* 06 54 48.7725512376 +13 10 03.448241940           ~ 6 0
3 HD 54079 * 07 07 49.4889933096 +07 28 16.373011404   6.915 5.739     K0III: 53 0

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