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American Astronomical Society, Research Notes of the American Astronomical Society, 4(8), p. 101, 2024

DOI: 10.3847/2515-5172/ad3de9

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Hidden Companions to Intermediate-mass Stars. XVII. Uncovering a 0.72 M <sub>⊙</sub>, 0.35 au Companion in the Spectroscopic Binary Sigma Sculptoris*

Journal article published in 2024 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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Red circle
Preprint: archiving forbidden
Red circle
Postprint: archiving forbidden
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Published version: archiving allowed
Data provided by SHERPA/RoMEO

Abstract

Abstract Sigma Sculptoris is a nearby star that was suspected of being a rotating Ap variable. It was recently found not to be an Ap star but rather a 47 days single-lined spectroscopic binary. Here we report on the direct detection of the companion with a K band flux ratio of 5.5% at a projected separation of 5.16 mas based on a VLTI/GRAVITY observation. We estimate isochrone masses M A = 1.95M and M B = 0.72M , a semimajor axis a = 0.35 au and an orbital inclination i = 27° (or 153°). The large rotational velocity of the primary (assuming spin–orbit alignment) is consistent with the lack of prominent chemical peculiarities.