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Interferometric Observations of V838 Monocerotis

B. F. Lane·A. Retter·R. R. Thompson·J. A. Eisner
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Abstract

We have used long-baseline near-IR interferometry to resolve the peculiar eruptive variable V838 Mon and to provide the first direct measurement of its angular size. Assuming a uniform disk model for the emission we derive an apparent angular diameter at the time of observations (November-December 2004) of $1.83 \pm 0.06$ milli-arcseconds. For a nominal distance of $8\pm2$ kpc, this implies a linear radius of $1570 \pm 400 R_{\odot}$. However, the data are somewhat better fit by elliptical disk or binary component models, and we suggest that the emission may be strongly affected by ejecta from the outburst.

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B. F. Lane, A. Retter, R. R. Thompson, J. A. Eisner. 2005-02-16. Interferometric Observations of V838 Monocerotis. https://doi.org/10.1086/429619

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