Interferometric Observations of V838 Monocerotis

Details Interferometric Observations of V838 Monocerotis Interferometric Observations of V838 Monocerotis

2005-02-15

arxiv.org/abs/astro-ph/0502293v2

Astrophys.J. 622 (2005) L137-L140

Astronomy and Astrophysics

Astrophysics

12 pages, 1 two-part encapsulated postscript figure. Accepted by ApJL. Added a table of observations

Scientific paper

10.1086/429619

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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