“Good Vibrations Seminar S2E12”: Dinil Bose Palakkatharappil (Observatoire de la Côte d’Azur, France)

May 11, 2022 | 10:00 am

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.

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