Warm Unbound Gas around T-Tauri Stars

Details Warm Unbound Gas around T-Tauri Stars Warm Unbound Gas around T-Tauri Stars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5806a&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #58.06; Bulletin of the American Astronomical Society, Vol. 24, p.1216

Astronomy and Astrophysics

Astronomy

Scientific paper

Mapping of selected T-Tauri stars in the J=6--5 and 3--2 transitions of CO at resolutions down to 7('') (1000 AU), as well as observations in transitions of the high-density tracers HCO(+) and HCN, reveals substantial amounts ({ ~ }10(-3}M_{sun ) ) of gravitationally unbound gas that is both warm ({>=}90 K) and dense ({ ~ }10(5) cm(-3) ). The emission is mostly at relatively low velocities, suggesting that it arises as a high-velocity wind strikes, heats, and accelerates ambient molecular material. Excluding ionized optical jets, which appear to be dynamically incapable of driving large-scale molecular outflows, such high-velocity winds are at best only marginally detectable in T-Tauri objects. Therefore, high-resolution observations of swept-up molecular material reported here are among the deepest probes yet of the molecular outflows in T-Tauri systems and of the engines driving them.

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