δ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642

Scientific paper - Original scientific paper

• Author: John Southworth
• Author: S J Murphy
• Author: K Pavlovski
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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 δ 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.

• Keywords (english): binaries: eclipsing, stars: fundamental parameters, stars: oscillations
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Monthly Notices of the Royal Astronomical Society: Letters
• Numbering: vol. 520, no. 1, pp. L53-L57
• p-ISSN: 1745-3925
• e-ISSN: 1745-3933
• DOI: https://doi.org/10.1093/mnrasl/slad004
• URN:NBN: urn:nbn:hr:217:749745
• Publication: 2023-03
• Document URL: https://academic.oup.com/mnrasl/article/520/1/L53/6987680
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Accepted 2023 January 11. Received 2023 January 10; in original form 2022 December 20.
• Created on: 2024-07-23 08:03:34