On the location of the compact infrared source in Cyg X-3

TL;DR

This paper refines the possible location of a compact infrared source in the Cyg X-3 system, building on previous work that identified the IR source near the X-ray source associated with the relativistic companion.

Contribution

It provides a more precise estimate of the IR source location in Cyg X-3 using qualitative analysis, complementing prior findings.

Findings

IR source located near the X-ray source

Refined positional estimate of the IR source

Supports previous association with the relativistic companion

Abstract

This note complements the article on X-ray and infrared variability of the X-ray binary Cyg X-3 (WR+c), published by me and my co-authors (ApJ, v.926, p. 123, 2022). In that paper, a compact IR source was discovered in the system, located in the vicinity of the X-ray source associated with the relativistic companion. In the current note I refine the possible location of the IR source based on simple qualitative considerations.