AAS 201st Meeting, January, 2003
Session 17. Stellar Evolution and Metal-Poor Stars
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[17.07] Theoretical Uncertainties at the Tip of the Red Giant Branch

S.R. Bjork, B.C. Chaboyer (Dartmouth College)

Using a Monte Carlo approach, we investigate theoretical uncertainties in stellar evolution models at the tip of the red giant brach. Specifically, we determine uncertainties in the luminosity and helium core mass at the tip of the red giant branch for metallicities [Fe/H] = -2.0, -1.5, and -1.0. Our Monte Carlo simulation takes into account uncertainties in helium composition, heavy element composition, radiative opacities, conductive opacities, nuclear reaction rates, surface boundary conditions, neutrino energy losses, diffusion, convection, and color transformations.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.