NOAO >   Observing Info >   Approved Programs >   2003A-0263

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Proposal Information for 2003A-0263


PI: Mercedes L\acuteopez-Morales, Univ. of North Carolina - Chapel Hill, lopezmor@physics.unc.edu
Address: Dept. of Physics and Astronomy, CB$\#$ 3255, Chapel Hill, NC 27599, USA

CoI: J. Christopher Clemens, Univ. of North Carolina - Chapel Hill
CoI: Bruce Carney, Univ. of North Carolina - Chapel Hill

Title: An accurate RV-curve for the new low-mass, double-lined, detached eclipsing binary ROTSEJ522155.16+335604.1

Abstract: The theoretical mass-radius relation for low-mass stars with M <=1M_\sun is currently constrained by only four observational measurements from the components of the double-lined, detached eclipsing binaries YYGem, and CMDra. We need, therefore, more observations to test the goodness of the models of stellar structure. We have now found a new binary of characteristics similar to the two systems above. The object, ROTSEJ152155.16+335604.1, has a V-I ~ 2.00 +/- 0.02 (I=11.7), and an estimated orbital period of 0.48872 days. These parameters suggest masses of the individual stars of about 0.5M_\sun, or less, which makes it an extremely valuable target of study to obtain two new accurate values of masses and radii of low-mass stars, from its light and radial velocity curves. Multiband light curves will be obtained at the SARA telescope. We request therefore time at the KPNO 4-m telescope to complete the necessary observations, by deriving the RV-curve of the system. The determination of these two new masses and radii will increase by more than 30% the number of existing observational data to constrain those models.


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NOAO >   Observing Info >   Approved Programs >   2003A-0263

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