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We present high-angular resolution observations of the circumstellar diskaround the massive Herbig Be star R Mon (M~8 Msun) in the continuum at 2.7mmand 1.3mm and the CO 1->0 and 2->1 rotational lines. Based on the new 1.3mmcontinuum image we estimate a disk mass (gas+dust) of 0.007 Msun and an outerradius of <150 AU. Our CO images are consistent with the existence of aKeplerian rotating gaseous disk around this star. Up to our knowledge, this isthe most clear evidence for the existence of Keplerian disks around massivestars reported thus far. The mass and physical characteristics of this disk aresimilar to thoseof the more evolved T Tauri stars and indicate a shortertimescale for the evolution and dispersal of circumstellar disks around massivestars which lose most of their mass before the star becomes visible.Comment: 5 page

A Keplerian Gaseous Disk around the B0 Star R Monocerotis