Interferometric Observations of V838 Monocerotis

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 $8\pm 2$ kpc, this implies a linear radius of $1570\pm 400R_{\odot }$. 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.

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

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Cited by in corpus (13)

• Evolution of V838 Monocerotis during and after the 2002 eruption
• VLTI/AMBER interferometric observations of the recurrent Nova RS Oph 5.5 days after outburst
• V838 Monocerotis: the central star and its environment a decade after outburst
• Detection of SiO Maser Emission in V838 Mon
• Near-Infrared water lines in V838 Monocerotis
• V4332 Sgr in 'Quiescence'
• High Spatial Resolution Mid-IR Imaging of V838 Monocerotis: Evidence of New Circumstellar Dust Creation
• Interferometric Observations of V1663 Aquilae (Nova Aql 2005)
• The mid-infrared environment of the stellar merger remnant V838 Monocerotis
• Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis
• Spectro-interferometric observations of classical nova V458 Vul 2007
• Interferometric Observations of Explosive Variables: V838 Mon, Nova Aql 2005, and RS Oph
• Nova Eruptions with Infrared Interferometric Observations