Abstract
We present a search for 1 2 CO and SiO emission in V838 Mon. We derive upper limits on the 1 2 CO and SiO emission, and on the total mass of the circumstellar material. Using an excitation temperature of 1000 K, and a likely distance of 6 kpc, the non-detection of 1 2 CO emission leads to a 3σ upper limit on the mass of gas around the central star to be 10 - 2 M O ..
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