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- W4379468526 abstract "Abstract λ Ophiuchi is a nearby 48 au intermediate-mass visual binary with a hierarchical, 6400 au wide companion. We report on the discovery of a close companion to the primary star ( Marfik ) with a K band flux ratio of 33% at a projected separation ρ = 6.1 mas ↔ 0.32 au based on a VLTI/GRAVITY observation. Isochrone fitting yields masses M Aa = 2.39 M ⊙ , M Ab = 1.62 M ⊙ and M B = 1.82 M ⊙ . λ Oph therefore joins a growing number of intermediate-mass binaries with 10–60 au separation in which the primary is found to be a close binary and which suggest that many white dwarfs with a main sequence companion at such separations (such as Sirius B) ultimately descended from merger products. In fact, λ Oph is a potential progenitor for a system resembling Sirius." @default.
- W4379468526 created "2023-06-07" @default.
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- W4379468526 date "2023-06-05" @default.
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- W4379468526 title "Hidden Companions to Intermediate-mass Stars. V. Discovery of a 1.6 M <sub>⊙</sub>, 0.3 au Companion to Marfik within the 48 au Visual Binary HIP 80883 = λ Ophiuchi*" @default.
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- W4379468526 doi "https://doi.org/10.3847/2515-5172/acda9d" @default.
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