Can I read Uncertainties in Asteroseismic Grid-based Estimates of the Ages of Halo Stars on EtoBox?

Uncertainties in Asteroseismic Grid-based Estimates of the Ages of Halo Stars by Moser, S.; Valle, G.; Dell'Omodarme, M.; Degl'Innocenti, S.; Moroni, P. G. Prada is a scholarly article available to read on EtoBox.

What is Uncertainties in Asteroseismic Grid-based Estimates of the Ages of Halo Stars about?

[...] The aim of this paper is to study the precision and theoretical biases in the age determinations of halo stars adopting both asteroseismic and classic observational constraints. [...] We adopt the well-tested SCEPtER pipeline, covering evolutionary phases up to the red giant branch (RGB). The fitting grids contain stars with mass in the range of [0.7; 1.0] $M_{\odot}$ and metallicity [Fe/H] from -2.5 to -0.5. We investigate several scenarios characterised by different adopted observational uncertainties. We also assess the impact of systematic discrepancies between the recovery grid models and target stars by computing several synthetic grids of stellar models with perturbed input physics. In our reference scenario, we recover ages for stars in the main sequence (MS) or subgiant branch (SGB) with a typical 10\%--20\% precision, while we recover those of RGB stars with a precision of about 60\%. However, adopting tighter constraints on asteroseismic parameters, the age precision in RGB improved to 20\%, while few modifications occur in the other analysed evolutionary phases. A systematic discrepancies between grid models and target stars shows that a mismatch in the mixing-len

Author

Moser, S.; Valle, G.; Dell'Omodarme, M.; Degl'Innocenti, S.; Moroni, P. G. Prada

Published

2023

Language

EN