Age constraints for the open cluster NGC 2477 using asteroseismology from TESS FFI
Precise ages of stars are important for understanding stellar
and galactic evolution. Asteroseismology can provide precise ages of
stars. Our objective is to combine NASA TESS data along with the ESA
GAIA photometric data, to search for, to detect and to analyse
oscillations in cluster members. Since stars in a cluster are assumed to
have the same age and chemical composition, this provides constraints
for the interpretation of asteroseismic data. We analysed the
intermediate-age open cluster NGC 2477, known to suffer from
differential extinction. Using TESS FFI images, we identified several
levels of variability of stars in this cluster, including binaries and
short- and long-period oscillating stars. We perform an asteroseismic
analysis on a small set of uncontaminated oscillating stars. We used
MESA and GYRE to make stellar models and to calculate the oscillation
frequencies. In this talk, I will present how we constrained the
cluster’s age by asteroseismic modelling of oscillating stars using the
general properties of the cluster along with the frequencies from
oscillating stars.