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J.R. Keller, D.W. Koerner (Northern Arizona University), C2D SIRTF Legacy Team
We present high-resolution optical spectroscopy of a large sample of weakline T Tauri stars (wTTs) in support of infrared observations scheduled with the Space Infrared Telescope Facility (SIRTF). Sensitive photometry at wavelengths up to 70 \mum will target wTTs associated with the Chameleon, Lupus, Ophiuchus, and Taurus star-forming regions under the Legacy program: From Molecular Cores to Planet-Forming Disks. SIRTF observations will determine if these stars have circumstellar disks intermediate in mass between that of accretion disks around classical T Tauri stars and debris disks around older stars. To understand factors which may affect disk masses, we have obtained high-resolution Echelle spectra of our sample with the CTIO and KPNO 4m telescopes. Stars were selected on the basis of published youth indicators such as ROSAT and Lithium abundance. The spectroscopic observations confirm the lithium indicator at high resolution and provide measurements of other properties of interest to disk evolution. These include emission lines such as H\alpha, the frequency of spectroscopic binaries, radial and rotational velocities, and metallicity. Here we present preliminary analyses of these properties. All spectra will be made available to the community together with the SIRTF data as they become available.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.