Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330302r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #303.02; Bulletin of the American Astronomical Society, Vol. 41, p.272
Astronomy and Astrophysics
Astronomy
Scientific paper
Accurate measurements of the fundamental physical properties of very-low-mass stars and brown dwarfs are crucial for understanding cool, complex atmospheres and calibrating evolutionary models. By studying a large sample of objects bright enough for high-resolution spectroscopy, we developed methods for determining physical properties as accurately and efficiently as possible. As part of the NIRSPEC Brown Dwarf Spectroscopic Survey (BDSS; McLean et al. 2003, 2007), we are conducting a detailed comparison of observed and synthetic spectra for a sample of young M and L dwarfs and field M, L, and T dwarfs, totaling 50 objects. High-resolution near-infrared spectra from the cross-dispersed echelle spectrometer NIRSPEC on Keck II provide an unequaled combination of resolving power and wavelength coverage. Synthetic spectra were created from PHOENIX atmosphere models calculated exclusively for this project with updated line lists and solar abundances. Combined with spectral types from photometry and low-resolution spectra and surface gravity predicted by age estimates, we anticipate the precision of measurements from the high-resolution spectra to be 75 K in effective temperature, 0.2 dex in surface gravity, 1 km/s in radial velocity, and 2 km/s in projected rotational velocity. Our results also distinguish between wavelength regimes for which the models reproduce observed high-resolution spectra and regimes in which model data, such as line lists and oscillator strengths, are lacking. This work combines a rich observational data set and sophisticated atmosphere models to advance our understanding of the correspondence between spectral features of low-mass objects and the physical properties of their cool atmospheres.
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