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Theoretical Uncertainties in the Subgiant--Mass Age Relation and the Absolute Age of Omega Cen | | Brian Chaboyer
; Lawrence M. Krauss
; | | Date: |
28 Dec 2001 | | Subject: | astro-ph | | Affiliation: | Dartmouth) and Lawrence M. Krauss (CWRU | | Abstract: | The theoretical uncertainties in the calibration of the relationship between the subgiant mass and age in metal-poor stars are investigated using a Monte Carlo approach. Assuming that the mass and iron abundance of a subgiant star are known exactly, uncertainties in the input physics used to construct stellar evolution models and isochrones lead to a Gaussian 1-sigma uncertainty of +/-2.9% in the derived ages. The theoretical error budget is dominated by the uncertainties in the calculated opacities. Observations of detached double lined eclipsing binary OGLEGC-17 in the globular cluster Omega Cen have found that the primary is on the subgiant branch with a mass of M = 0.809+/-0.012 M_sun and [Fe/H]= -2.29+/-0.15 (Kaluzny et al. 2001). Combining the theoretical uncertainties with the observational errors leads to an age for OGLEGC-17 of 11.10+/-0.67 Gyr. The one-sided, 95% lower limit to the age of OGLEGC-17 is 10.06 Gyr, while the one-sided, 95% upper limit is 12.27 Gyr. | | Source: | arXiv, astro-ph/0201443 | | Services: | Forum | Review | PDF | Favorites | |
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