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We present Hubble Space Telescope STIS far-UV spectra of the edge-on diskaround 49 Ceti, one of the very few debris disks showing sub-mm CO emission.Many atomic absorption lines are present in the spectra, most of which arisefrom circumstellar gas lying along the line-of-sight to the central star. Wedetermined the line-of-sight CI column density, estimated the total carboncolumn density, and set limits on the OI column density. Surprisingly, noline-of-sight CO absorption was seen. We discuss possible explanations for thisnon-detection, and present preliminary estimates of the carbon abundances inthe line-of-sight gas. The C/Fe ratio is much greater than the solar value,suggesting that 49 Cet harbors a volatile-rich gas disk similar to that of BetaPictoris.

Volatile-Rich Circumstellar Gas in the Unusual 49 Ceti Debris Disk