Testing Low-Mass Stellar Models from Detached Eclipsing Binaries

Details Testing Low-Mass Stellar Models from Detached Eclipsing Binaries Testing Low-Mass Stellar Models from Detached Eclipsing Binaries

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..241l&link_type=abstract

NOAO Proposal ID #2001B-0241

Physics

Scientific paper

While a large effort is being put these days in the study of substellar objects and the characterization of all the stars within few parsecs from the Sun, we are all forgetting about how innacurately we know the physics of stars below 1 M_sun. We only know masses and radii, fundamental parameters to test the models, for the components of three low-mass binaries ( YYGem, CMDra, and GJ2069A); not enough to constrain the models. Two more of these binaries, with I 11.8 and 12.0, have been discovered recently in the Southern Hemisphere by the All Sky Automated Survey (ASAS). Our purpose is to obtain new radial velocity curves, and improve the light curves from ASAS for these two binaries, and from here to increase by almost a factor of two the number of available observations to test the lower main sequence mass-radius relation. To do this, we are requesting time in the 4-m and 0.9-m telescopes to obtain the high resolution spectra and the time series photometry necessary to derive those curves.

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