Extended CO emission in the field of the light echo of V838 Mon

Abstract

V838 Mon erupted at the beginning of 2002 becoming an extremely luminous star with L=10^6 L_sun. The outburst was followed by the spectacular light echo that revealed that the star is immersed in a diffuse and dusty medium, plausibly interstellar in nature. Low angular resolution observations in the lowest CO rotational transitions revealed a molecular emission from the direction of V838 Mon. The origin of this CO emission has not been established. In this paper we investigate the idea that the molecular emission originates in the material responsible for the optical light echo. We report on observations of 13 positions within the light echo in the two lowest rotational transitions of CO using the IRAM 30 m telescope. Emission in CO J=1-0 and J=2-1 was detected in three positions. In three other positions only weak J=1-0 lines were found. We conclude that the molecular emission from the direction of V838 Mon is extended and has a complex distribution. We identify the emission as arising from diffuse interstellar clouds and suggest that the CO-bearing gas and the echoing dust are collocated in the same interstellar cloud.

arXiv comment6 pages, 2 figures (+2 figures in an appendix), submitted to A&A. High resolution version of Fig. 1 at http://www.ncac.torun.pl/~tomkam/AAII/Fig1.eps

References in corpus (20)

• An energetic stellar outburst accompanied by circumstellar light echoes
• The mysterious eruption of V838 Mon
• Main-sequence stellar eruption model for V838 Mon
• Eruptions of the V838 Mon type: stellar merger versus nuclear outburst models
• Evolution of V838 Monocerotis during and after the 2002 eruption
• A model of an expanding giant that swallowed planets for the eruption of V838 Monocerotis
• V838 Monocerotis: A Geometric Distance from Hubble Space Telescope Polarimetric Imaging of its Light Echo
• Formation, fractionation and excitation of carbon monoxide in diffuse clouds
• The peculiar variable V838 Mon
• The post-outburst photometric behaviour of V838 Mon
• On the light echo in V838 Mon
• On the progenitor of V838 Monocerotis
• A Young Stellar Cluster Surrounding the Peculiar Eruptive Variable V838 Monocerotis
• Spectroscopic and Spectropolarimetric Observations of V838 Mon
• V838 Mon: light echo evolution and distance estimate
• Observations of Stellar Maser Sources with no IRAS Counterpart
• Spitzer Observations of V838 Monocerotis: Detection of a Rare Infrared Light Echo
• Observations of V838 Mon in the CO rotational lines
• The properties of V838 Mon in 2002 November
• The first three years of the outburst and light-echo evolution of V838 Mon and the nature of its progenitor

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