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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29424
Title: The Helium Abundance of NGC 6791 from Modeling of Stellar Oscillations
Authors: McKeever, Jean M.
Basu, Sarbani
CORSARO, ENRICO MARIA NICOLA 
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 874
Issue: 2
First Page: 180
Abstract: The helium abundance of stars is a strong driver of evolutionary timescales; however, it is difficult to measure in cool stars. We conduct an asteroseismic analysis of NGC 6791, an old, metal-rich open cluster that previous studies have indicated also has a high helium abundance. The cluster was observed by Kepler and has unprecedented light curves for many of the red giant branch stars in the cluster. Previous asteroseismic studies with Kepler data have constrained the age through grid-based modeling of the global asteroseismic parameters ({{∆ }}ν and {ν }<SUB>\max </SUB>). However, with the precision of Kepler data, it is possible to do detailed asteroseismology of individual mode frequencies to better constrain the stellar parameters, something that has not been done for these cluster stars as yet. In this work, we use the observed mode frequencies in 27 hydrogen shell burning red giants to better constrain initial helium abundance (Y <SUB>0</SUB>) and age of the cluster. The distributions of helium abundance and age for each individual red giant are combined to create a final probability distribution for age and helium abundance of the entire cluster. We find a helium abundance of Y <SUB>0</SUB> = 0.297 ± 0.003 and a corresponding age of 8.2 ± 0.3 Gyr.
URI: http://hdl.handle.net/20.500.12386/29424
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab0c04
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab0c04
Bibcode ADS: 2019ApJ...874..180M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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