POSTER ABSTRACTSP0602. POSTER SESSION IIA very precise age for the old metal-rich open cluster NGC6791K. Brogaard 1 and E. Sandquist 2 et al. 3,41Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada,kfb@phys.au.dk2Department of Astronomy, San Diego State University, San Diego, CA 92182, USA, erics@mintaka.sdsu.edu3The team behind <strong>Kepler</strong> Guest Observer programme 200444The KASC working group #2 on 'Oscillations in clusters'Abstract:Exploiting synergies among the measurements ofcluster member eclipsing binaries [1], color-magnitudediagrams and ensemble asteroseismology ofcluster stars [2,3] allows unprecedented constraintson stellar models and cluster parameters, includingtheir ages.References:[1] Brogaard K. et al. (2011) A&A, 525, 2[2] Basu S. et al. (2011) ApJL, 729, 10[3] Miglio A. et al. (2011) MNRAS,accepted (ArXiv:1109.4723)[4] Brogaard K. et al. In preparationWe show here how <strong>Kepler</strong> is aiding such proceduresand bringing us closer to a consistent understandingof stellar evolution in the old metal-richopen cluster NGC6791 [3,4].The age of NGC6791 is determined more preciselythan for any other old open cluster [4] and we askthe question whether this age is also accurate? Aspart of this, we demonstrate remaining inconsistenciesand how <strong>Kepler</strong> will help solve them.1742011 <strong>Kepler</strong> Science Conference - <strong>NASA</strong> Ames Research Center
POSTER ABSTRACTSP0603. POSTER SESSION IILOW-MASS ECLIPSING BINARIES FROM KEPLER: REACHING THE NATURAL ROTATION RATEOF M AND K DWARFS. J. L. Coughlin 1 , M. López-Morales 2 , T. E. Harrison 1 , and N. Ule 1 ,1 Department of Astronomy, New Mexico State University, P.O. Box 30001, MSC 4500, Las Cruces, NM88003-8001, jlcough@nmsu.edu, 2 Institut de Ciències de l'Espai (CSIC-IEEC), mlopez@ieec.uab.esIntroduction: An outstanding problem in stellarastrophysics is that the radii of low-mass, mainsequencestars in eclipsing binary systems areconsistently ~10-15% larger than predicted by stellarmodels. This inflation is hypothesized to be primarilydue to enhanced magnetic activity as a result of theirbinarity, and thus artificially enhanced rotation rates.Thus, such an effect should diminish with increasingperiod, but only a small number of low-mass eclipsingbinary systems are known in general, fewer are wellstudiedwith precise light and radial-velocity curves,and barely any of these are at long periods. In additionto exploring the physics of low-mass stars, researchinto this area helps to better characterize the radii ofextrasolar planets around low-mass stars, whose valuesare dependent on those assumed for the host star.New Low-Mass EB’s from <strong>Kepler</strong>: We havepreviously presented results from our search for newlow-mass eclipsing binary systems via our <strong>Kepler</strong>Guest Observer programs and a search through thepublicly available data [1][2]. We identified over 100 +low-mass eclipsing binaries suitable for ground-basedfollow-up, with 30 of them having periods greater than10 days. We also modeled the <strong>Kepler</strong> light curves ofthese systems, and found preliminary evidence for atrend of decreasing stellar radii with increasing orbitalperiod [1].Ground-based Follow-Up: We present results ofour ongoing effort to obtain ground-based multi-colorlight and radial velocity curves of these systems via theKitt Peak National Observatory 4-meter, the ApachePoint Observatory 3.5-meter, and New Mexico StateUniversity 1-meter telescopes. We also presentpreliminary modeling of these data combined with thatfrom the <strong>Kepler</strong> mission, and examine what futurework is needed to make progress in this area.References: [1] Coughlin et al. (2011) AJ, 141, 78.[2] Harrison et al. (2011), AJ, Submitted.2011 <strong>Kepler</strong> Science Conference - <strong>NASA</strong> Ames Research Center 175