The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion

C. S. Kochanek (1); K. Z. Stanek (1); T. A. Thompson (1); The Ohio State University (2) Independent Researcher); T. Jayasinghe (2) ((1) Department of Astronomy

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The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion

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arxiv 2509.10608 v1 pith:2I6UYF6Q submitted 2025-09-12 astro-ph.SR astro-ph.HE

C. S. Kochanek (1) , K. Z. Stanek (1) , T. A. Thompson (1) , T. Jayasinghe (2) ((1) Department of Astronomy , The Ohio State University (2) Independent Researcher) This is my paper

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V723 Mon is a high mass function (f=1.7Msun) single lined spectroscopic binary with a red giant primary that Jayasinghe et al. (2021) suggested had a black hole as its massive companion. Unfortunately, el-Badry et al. (2022) demonstrated that it had a hotter stellar companion whose detectability in optical spectra was difficult due to its rapid rotation. Here we confirm the presence of the stellar companion with a Hubble Space Telescope STIS ultraviolet spectrum.

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