We quantify the effects of the uncertainties in the main physical inputs on the evolution of low mass stars. We calculated several thousands of stellar tracks by simultaneously changing the main physical inputs within their current range of uncertainty. The analysis was conducted performing a systematic variation on a fixed grid, in a way to obtain a full crossing of the perturbed input values. We find that, for a 0.9 Msun model, the cumulative uncertainty on the turn-off, the red-giant branch tip, and the ZAHB luminosities accounts for ± 0.021 dex, ± 0.03 dex, and ± 0.045 dex respectively, while the central hydrogen exhaustion time varies of about ± 0.72 Gyr.

Cumulative propagation of physical uncertainties in stellar models

PRADA MORONI, PIER GIORGIO;VALLE, GIADA;DEGL'INNOCENTI, SCILLA
2015-01-01

Abstract

We quantify the effects of the uncertainties in the main physical inputs on the evolution of low mass stars. We calculated several thousands of stellar tracks by simultaneously changing the main physical inputs within their current range of uncertainty. The analysis was conducted performing a systematic variation on a fixed grid, in a way to obtain a full crossing of the perturbed input values. We find that, for a 0.9 Msun model, the cumulative uncertainty on the turn-off, the red-giant branch tip, and the ZAHB luminosities accounts for ± 0.021 dex, ± 0.03 dex, and ± 0.045 dex respectively, while the central hydrogen exhaustion time varies of about ± 0.72 Gyr.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/779366
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