IR Spectroscopy of T Tauri stars in support of HST observations

Details IR Spectroscopy of T Tauri stars in support of HST observations IR Spectroscopy of T Tauri stars in support of HST observations

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..276l&link_type=abstract

NOAO Proposal ID #1999B-0276

Physics

Scientific paper

99% of the mass of the circumstellar disks surrounding young stars is in cool gas, and most of that is molecular hydrogen (H_2). We are studying this H_2 gas by observing the permitted fluorescent transitions in the UV Lyman and Werner bands. To this end we have been awarded 40 orbits on the HST and 50 ksec of time on FUSE. We propose here for ground-based observations to support this UV spectroscopy of 8 classical T Tauri stars. We propose to obtain moderate resolution IR spectra of H_2 vibrational transitions, to study the local thermal environments and electron occupation functions. These near-IR spectra, along with the UV data, will enable us to clarify the heating mechanisms, calculate the excitation temperature and determine the density of the emitting gases. The limited spatial information provided by this effort will also help us deduce the distribution of gases, thus provide constraints on gas disk parameters (mass and size) and evolution history. Although our primary aim is to study the molecular gas, we will also obtain a unprecedented view of the chromospheric and transition region activity of this sample of stars. We propose to obtain high S/N, high resolution optical spectra as part of an effort to understand the stellar magnetic and accretional activity during this observing season.

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