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2023RNAAS...7..231W - Research Notes of the AAS, 7, 231 (2023/October-0)

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

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

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 MAa = 1.98 M⊙, MAb = 1.80 M⊙ and MB = 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.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Multiple stars - A stars - Optical interferometry - Delta Scuti variable stars

Simbad objects: 3

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