Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7829j&link_type=abstract
HST Proposal ID #7829
Physics
Hst Proposal Id #7829 Cool Stars Low-Mass Stars
Scientific paper
We will study the distribution of circumstellar dust and molecular {H_2} gas around six classical T Tauri stars {cTTS}. We will probe both the near circumstellar environment {the accretion disk} as well as the environment further out where strong winds from these stars may be interacting with remnants of the cloud material from which they formed. The primary goal is to map the distribution of the molecular gas around cTTS. All our proposed targets show UV fluorescent H_2 emission {Johns-Krull et al. 1997; Valenti et al. 1997}, and are therefore expected to show IR molecular hydrogen emission. These images will reveal what fraction of the H_2 emission is produced in the warm circumstellar disks surrounding young these stars. The morphology of the extended emission will constrain collimation processes that focus the outflows from these stars. Combined with our UV data, these observations will allow us to test the thermal+fluorescent excitation model of molecular hydrogen {Black & van Dishoeck 1987}. These data, combined with future HST UV imaging and long-slit spectroscopy {STIS and ground-based IR} will provide very tight constraints on the physical conditions and excitation mechanisms present in the gaseous circumstellar environments of these stars.
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