δ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642
Article
Southworth, John, Murphy, S J and Pavlovski, K. 2023. "δ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642 ." Monthly Notices of the Royal Astronomical Society: Letters. 520 (1), pp. L53-L57. https://doi.org/10.1093/mnrasl/slad004
Article Title | δ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642 |
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ERA Journal ID | 41989 |
Article Category | Article |
Authors | Southworth, John, Murphy, S J and Pavlovski, K |
Journal Title | Monthly Notices of the Royal Astronomical Society: Letters |
Journal Citation | 520 (1), pp. L53-L57 |
Number of Pages | 5 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 1745-3925 |
1745-3933 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnrasl/slad004 |
Web Address (URL) | https://academic.oup.com/mnrasl/article-abstract/520/1/L53/6987680 |
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 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 | binaries; eclipsing; fundamental parameters; oscillations; stars |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Public Notes | The accessible file is the accepted version of the paper. Please refer to the URL for the published version. |
Byline Affiliations | Keele University, United Kingdom |
Centre for Astrophysics | |
University of Zagreb, Croatia |
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https://research.usq.edu.au/item/z26xw/-scuti-pulsations-in-the-bright-pleiades-eclipsing-binary-hd-23642
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