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Published in

American Astronomical Society, Research Notes of the American Astronomical Society, 10(7), p. 231, 2023

DOI: 10.3847/2515-5172/ad0782

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Hidden Companions to Intermediate-mass Stars. XII. Discovery of a 1.8 M <sub>⊙</sub>, 1.3 au Companion to Delta Serpentis A*

Journal article published in 2023 by Idel Waisberg ORCID, Ygal Klein ORCID, Boaz Katz ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Preprint: archiving forbidden
Red circle
Postprint: archiving forbidden
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Published version: archiving allowed
Data provided by SHERPA/RoMEO

Abstract

Abstract Delta Serpentis is a nearby 4″ visual binary (A+B) that has accrued a number of astrometric anomalies. Here we show that the primary component is actually a close binary based on a VLTI/GRAVITY archival interferometric observation. The newly discovered companion has a K band flux ratio of 33% at a projected separation ρ = 23.9 mas ↔ 1.3 au. Through isochrone fitting we find somewhat evolved 1.2 Gyr old M Aa = 1.98 M , M Ab = 1.80 M and M B = 1.88 M stars. Delta Ser joins a growing list of intermediate mass hierarchical multiples and may be a progenitor of a rather rare system of three white dwarfs.