Benchmarking of Spectral Synthesis Techniques for Determining the Fundamental Physical Properties of Young, Low-mass Stars

Details Benchmarking of Spectral Synthesis Techniques for Determining the Fundamental Physical Properties of Young, Low-mass Stars Benchmarking of Spectral Synthesis Techniques for Determining the Fundamental Physical Properties of Young, Low-mass Stars

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8715s&link_type=abstract

American Astronomical Society Meeting 210, #87.15; Bulletin of the American Astronomical Society, Vol. 39, p.199

Astronomy and Astrophysics

Astronomy

Scientific paper

Current models of protostellar evolution may be correct but do not yet have a strong underpinning of observational support. The most critical missing data are measured masses for objects with different surface temperatures and luminosities. As with main sequence and post main sequence stars, these masses must come from orbital determinations for binaries. To date, the number of pre-main-sequence (PMS) stars with masses determined directly from orbital motion are too few to sufficiently cover the region of the H-R diagram occupied by low mass PMS stars. With emergence of sensitive high resolution near-IR spectrometers on large telescopes, we now have the capability to measure fundamental stellar properties, such as Teff and log g, from spectroscopy alone. This new technique relies on precise fits of synthetic spectral templates to photospheric lines in the near-IR. Here we report preliminary results of our application of this new spectral fitting technique to Keck/NIRSPEC observations of a sample of main-sequence and PMS eclipsing binary stars, whose physical properties are empirically and accurately determined, in order to calibrate this technique as a reliable way to anchor PMS objects in the H-R diagram. Once properly calibrated, this technique will provide a means for accurately determining the temperatures and gravities of PMS stars. More generally, the result of this experiment will be a validated tool broadly useful for the determination of fundamental parameters of young stars.

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