Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..196s&link_type=abstract
NOAO Proposal ID #2002B-0196
Physics
Scientific paper
The discovery and analysis of pre-main-sequence (PMS) eclipsing binary star systems is of critical importance to the study of star formation and young stellar populations. With only four PMS eclipsing binary systems presently known, the evolutionary tracks which are used to infer fundamental stellar properties such as masses and ages-and from which stellar initial mass functions are constructed-remain largely uncalibrated by empirical mass determinations, particularly in the sub-solar-mass regime. We have an intensive observing program under way to substantially increase the sample of low-mass PMS eclipsing binaries. Our program has already produced one new PMS eclipsing binary, SM790, which includes the lowest-mass (0.7 M_&sun;) PMS star in an eclipsing binary. We have now identified three new promising eclipsing binary candidates in the Orion star-forming region. One of these, SM4147, is particularly interesting because its position in the color-magnitude diagram indicates its mass to be ~ 0.1 M_&sun;, which would represent the first empirical mass determination at the stellar/sub- stellar boundary. We propose here to obtain the necessary observations for spectroscopic and photometic analyses of these new PMS eclipsing binary systems. Specifically, we request 1) high-resolution spectra with Gemini/Phoenix and with the HET/HRS providing precise double- lined orbits, and 2) BVRI monitoring with the CTIO 0.9m to provide multi-color light curves for modeling and analysis.
Mathieu Robert
Stassun Keivan G.
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