Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.6606d&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #66.06; Bulletin of the American Astronomical Society, Vol. 34, p.1217
Astronomy and Astrophysics
Astronomy
Scientific paper
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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