Asteroseismology of the Hyades red giant and planet host epsilon Tauri

Abstract

Asteroseismic analysis of solar-like stars allows us to determine physical parameters such as stellar mass, with a higher precision compared to most other methods. Even in a well-studied cluster such as the Hyades, the masses of the red giant stars are not well known, and previous mass estimates are based on model calculations (isochrones). The four known red giants in the Hyades are assumed to be clump (core-helium-burning) stars based on their positions in colour-magnitude diagrams, however asteroseismology offers an opportunity to test this assumption. Using asteroseismic techniques combined with other methods, we aim to derive physical parameters and the evolutionary stage for the planet hosting star epsilon Tau, which is one of the four red giants located in the Hyades. We analysed time-series data from both ground and space to perform the asteroseismic analysis. By combining high signal-to-noise (S/N) radial-velocity data from the ground-based SONG network with continuous space-based data from the revised Kepler mission K2, we derive and characterize 27 individual oscillation modes for epsilon Tau, along with global oscillation parameters such as the large frequency separation and the ratio between the amplitude of the oscillations measured in radial velocity and intensity as a function of frequency. The latter has been measured previously for only two stars, the Sun and Procyon. Combining the seismic analysis with interferometric and spectroscopic measurements, we derive physical parameters for epsilon Tau, and discuss its evolutionary status.

13 pages, 13 figures, 4 tables, accepted for publication in Astronomy & Astrophysics

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• The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
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• Oscillations in the Sun with SONG: Setting the scale for asteroseismic investigations
• An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
• Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: resolving the retired A-star mass controversy
• The relationship between photometric and spectroscopic oscillation amplitudes from 3D stellar atmosphere simulations
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• Exploring the dependence of chemical traits on metallicity: chemical trends for red giant stars with asteroseismic ages
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• The Relative Calibration of Radial Velocity for LAMOST Medium Resolution Stellar Spectra
• Halo Photometry and Asteroseismology for 98 of the Brightest Stars Observed by TESS
• Attempting an accurate age estimate of the open cluster NGC 6633 using CoRoT and Gaia