Yoshimi Kitamura

350 AU Scale Circumstellar Rotating Gaseous Disk Around DM Tauri

We undertook a survey of the CO emission from protoplanetary gas disks around T Tauri stars using the Nobeyama 45m telescope. The purpose of these observations was to study the structure and evolution of the gas disks and study the process of planet formation. Through the survey, CO emission was found toward DM Tau (Handa et al. 1995). The following observations of DM Tau were made using the Nobeyama Millimeter Array (NMA) to investigate the distribution and kinematics of molecular gas associated with DM Tau. Here, we present the results for DM Tau. DM Tau is a single classical T Tauri star in the Taurus region(140 pc). The stellar mass and age are estimated to be 0.48 M⊙ and 1 x 106 yr from the H-R diagram.

Aperture Synthesis CS(J=1-0) Observations of the Molecular Outflow in NGC 2071: Subclumps in a Wind-Driven Shocked Shell and their Origin

Aperture synthesis CS(J=l-0) observations were made of the expanding clumpy shocked shell that was found around the redshifted CO outflow in NGC 2071 during our previous study (Kitamura et al. 1990). It has been revealed that previously identified clumps in the shell comprise several small subclumps. The decelerating shock and Rayleigh-Taylor instabilities seem to be probable mechanisms by which the subclumps are formed in the shock-compressed shell.