Determining the seismic age of the young open cluster $\alpha$ Per using $\delta$ Scuti stars

Abstract

In this work we aim at constraining the age of the young open cluster Melotte 20, known as $\alpha$ Per, using seismic indices. The method consists of the following steps: 1) Extract the frequency content of a sample of stars in the field of an open cluster. 2) Search for possible regularities in the frequency spectra of $\delta$ Scuti candidates, using different techniques, such as the Fourier transform, the autocorrelation function, the histogram of frequency differences and the échelle diagram. 3) Constrain the age of the selected stars by both the physical parameters and seismic indices by comparing them with a grid of asteroseismic models representative of $\delta$ Scuti stars. 4) Find possible common ages between these stars to determine the age of the cluster. We performed the pulsation analysis with MultiModes, a rapid, accurate and powerful open-source code, which is presented in this paper. The result is that the age of $\alpha$ Per could be between 96 and 100 Myr. This is an improvement over different techniques in the past. We therefore show that space astroseismology is capable of taking important steps in the dating of young open clusters.

16 pages, 14 figures, uses the open-source code MultiModes (see https://github.com/davidpamos/MultiModes). It will be published in MNRAS

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Cited by in corpus (12)

• Untangling the Galaxy. IV. Empirical Constraints on Angular Momentum Evolution and Gyrochronology for Young Stars in the Field
• The IACOB project XII. A new grid of northern standards for the spectral classification of B-type stars
• Stellar Rotation and Structure of the $\alpha$ Persei Complex: When Does Gyrochronology Start to Work?
• Dating young open clusters using delta Scuti stars. Results for Trumpler 10 and Praesepe
• An empirical isochrone archive for nearby open clusters
• Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images
• Modelling of the scandium abundance evolution in AmFm stars
• Exploring the convective core of the high-amplitude $\delta$ Scuti star TIC 120857354 with asteroseismology
• Statistical analysis of asteroseismic indices and stellar parameters of TESS-observed $\delta$ Scuti stars
• Characterizing bright $\delta$ Scuti pulsators using TESS lightcurves
• Catalog of Integrated-Light Star Cluster Light Curves in TESS
• Asteroseismology of 35 Kepler and TESS $\delta$ Scuti stars near the red edge of the instability strip. The limitations of $\delta$ Scuti stars for dating open clusters