NOAO >   Observing Info >   Approved Programs >   2003B-0332

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Proposal Information for 2003B-0332


PI: Lisa Prato, UCLA, lprato@astro.ucla.edu
Address: Physics Department, 8371 Math Sciences, Los Angeles, CA 90095-1562, USA

Title: Pre-Main-Sequence Double-Lined Spectroscopic Binaries

Abstract: Mass ratios of low-mass, pre-main-sequence, spectroscopic binaries provide key information for understanding binary star and star-brown dwarf formation. Measurements of precise mass ratios are necessary, in conjunction with mapped orbits, to determine the absolute masses of stars. Mass, the most important stellar parameter, is required to calibrate models of young star and brown dwarf evolution. Accurate mass ratio distributions of low-mass, double-lined spectroscopic binaries in the nearby star forming regions provide key data for developing viable models of close binary star formation and evolution. I propose to observe infrared spectra with the NIRSPEC spectrometer on Keck II to obtain critical phase coverage of spectroscopic binaries observed previously and initial data for pairs as yet unobserved in this program, with the goal of converting all known single-lined systems to double- lined systems to measure mass ratios. Infrared light observations reveal the smallest dynamical mass ratios ever identified in pre-main- sequence systems.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2003B-0332

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