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δ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642

Southworth, John; Murphy, S J; Pavlovski, K

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Authors

S J Murphy

K Pavlovski



Abstract

We announce the discovery of pulsations in HD?23642, the only bright eclipsing system in the Pleiades, based on light curves from the Transiting Exoplanet Survey Satellite (TESS). We measure 46 pulsation frequencies and attribute them to d?Scuti pulsations in the secondary component. We find four l = 1 doublets, three of which have frequency splittings consistent with the rotation rate of the star. The dipole mode amplitude ratios are consistent with a high stellar inclination angle and the stellar rotation period agrees with the orbital period. Together, these suggest that the spin axis of the secondary is aligned with the orbital axis. We also determine precise effective temperatures and a spectroscopic light ratio, and use the latter to determine the physical properties of the system alongside the TESS data and published radial velocities. We measure a distance to the system in agreement with the Gaia parallax, and an age of 170 ± 20?Myr based on a comparison to theoretical stellar evolutionary models.

Journal Article Type Article
Acceptance Date Jan 11, 2023
Online Publication Date Jan 14, 2023
Publication Date Dec 23, 2022
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 520
Issue 1
Pages L53-L57
DOI https://doi.org/10.1093/mnrasl/slad004
Keywords Space and Planetary Science, Astronomy and Astrophysics
Publisher URL https://academic.oup.com/mnrasl/article-abstract/520/1/L53/6987680?redirectedFrom=fulltext

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