Asteroseismology of alpha Cen A. Evidence of rotational splitting
M. Bazot, F. Bouchy, H. Kjeldsen, S. Charpinet, M. Laymand, S., Vauclair

TL;DR
This study improves the understanding of alpha Cen A's internal structure by identifying 34 p modes and highlighting the significance of rotational splitting in seismic analysis, using high-precision radial-velocity data from HARPS.
Contribution
The paper provides a detailed seismic characterization of alpha Cen A, including the first identification of multiple p modes and the demonstration of rotational splitting effects.
Findings
Identified 34 p modes with specific angular degrees and frequencies.
Detected rotational splitting affecting mode frequencies and lifetimes.
Derived new small separation values considering rotation.
Abstract
Asteroseismology provides a unique tool for studying stellar interiors. Recently p modes have been detected on the bright solar-like star alpha Cen A thanks to high-precision radial-velocity measurements. However a better characterisation of these p modes is clearly needed to constrain theoretical models. We observed alpha Cen A during five nights using the HARPS spectrograph in order to improve our knowledge of the seismic properties of this star. We performed high-precision radial-velocity sequences and computed the acoustic spectrum of alpha Cen A. We identify 34 p modes with angular degree l=0-3 in the frequency range 1.8-2.9 mHz and amplitude range 13-48 cm/s, in agreement with previous seismic studies. We find an enhancement of the frequency scatter with the angular degree l that indicates, considering the high inclination axis of alpha Cen A, rotational splitting and explains the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astro and Planetary Science
