AAS 201st Meeting, January, 2003
Session 66. Star Formation II
Oral, Tuesday, January 7, 2003, 2:00-3:30pm, 608-609

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[66.06D] Probing the Evolutionary State of Pre-Main Sequence Stars using High Resolution Near-IR Spectroscopy and Detailed Fits to Spectral Synthesis Models

G.W. Doppmann (NASA Ames Research Center)

I describe a new technique for deriving effective temperatures, surface gravities, vsini rotational velocities, and the amount of non-stellar continuum excess (veiling) from infrared spectra at high resolution of low mass pre-main sequence stars. The derived protostellar and disk properties are measured by matching the shapes and relative strengths of closely spaced photospheric absorption lines to spectral synthesis models at high resolution (R > 15,000) in the K-band. Fits to near-IR spectra of MK standards have validated the technique and provided an analysis of the systematic errors. I apply the technique to a sample of Class II T-Tauri stars in Ophiuchus. This new spectral fitting technique offers the promise of improved accuracy in placing young stellar objects on evolutionary model tracks, independent of low resolution spectroscopy and photometry.

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