2023RNAAS...7..125W


Query : 2023RNAAS...7..125W

2023RNAAS...7..125W - Research Notes of the AAS, 7, 125 (2023/June-0)

Hidden Companions to Intermediate-mass Stars. VI. Discovery of a 0.50M⊙, 6 au Companion to HIP 74696.

WAISBERG I., KLEIN Y. and KATZ B.

Abstract (from CDS):

A-type stars with a large long-term proper motion change and without a known companion to cause it are candidates for being Sirius analogues. However, in most cases the culprit is expected to be a hitherto unknown low mass companion rather than a white dwarf. Here we report the discovery of a 0.50M⊙ companion to the nearby 1.64M⊙ star HIP 74696 at a projected separation ρ = 118.9 mas ↔ 6.2 au based on a VLTI/GRAVITY observation. This companion explains the Gaia-Hipparcos proper motion change of the primary. Together with the wide 660 au companion that was found by Gaia DR3 to be a 0.70M⊙ + 0.20M⊙ 1.5 au binary, this makes HIP 74696 a quadruple and part of the growing class of high multiplicity systems with an A-type star primary.

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

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

Simbad objects: 5

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Number of rows : 5
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 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1610 0
2 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 563 1
3 HD 135235 * 15 15 53.6732056920 -48 04 25.267073232   6.160 5.958     A2IIIs 35 0
4 CD-47 9824B SB* 15 15 54.0498530088 -48 04 12.828346860     10.4     ~ 3 0
5 HD 135375 * 15 16 34.6205243616 -47 41 48.947422236   8.75 7.45     K2III 12 0

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