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2024RNAAS...8..258W - Research Notes of the AAS, 8, 258 (2024/October-0)

Hidden Companions to Intermediate-mass Stars. Upgraded Multiplicity 2 → 3. XXIII. Discovery of a 0.94M⊙, 9.2 au Companion to the Ap Star Gamma Piscis Austrini A.

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

Gamma Piscis Austrini is a nearby ρ = 4.″1 ↔ 284 au visual binary consisting of an A0Vp primary (A) and an F5V secondary (B). Here we report that the primary is actually a closer binary based on a VLTI/GRAVITY interferometric observation. The newly discovered companion Ab has a K band flux ratio 4.8% ± 0.2% and a projected separation ρ = 143.50 mas ↔ 9.2 au relative to Aa. We estimate isochrone masses MAa = 2.65M⊙, MAb = 0.94M⊙ and MB = 1.20M⊙. γ PsA will become a triple white dwarf system within a Hubble time, with a low enough hierarchy for possibly interesting dynamical effects with a timescale PKL ∼ 200 kyr.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Multiple stars - Ap stars - Optical interferometry

Simbad objects: 2

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