Polarimetric detection of non-radial oscillation modes in the β Cephei star β Crucis
Article
Article Title | Polarimetric detection of non-radial oscillation modes in the β Cephei star β Crucis |
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ERA Journal ID | 213748 |
Article Category | Article |
Authors | Cotton, Daniel V., Buzasi, Derek L., Aerts, Conny, Bailey, Jeremy, Burssens, Siemen, Pedersen, May G., Stello, Dennis, Kedziora-Chudczer, Lucyna, De Horta, Ain, De Cat, Peter, Lewis, Fiona, Malla, Sai Prathyusha, Wright, Duncan J. and Bott, Kimberly |
Journal Title | Nature Astronomy |
Journal Citation | 6 (1), pp. 154-164 |
Number of Pages | 11 |
Year | 2022 |
Publisher | Nature Publishing Group |
Place of Publication | United Kingdom |
ISSN | 2397-3366 |
Digital Object Identifier (DOI) | https://doi.org/10.1038/s41550-021-01531-9 |
Web Address (URL) | https://www.nature.com/articles/s41550-021-01531-9 |
Abstract | Here we report the detection of polarization variations due to non-radial modes in the β Cephei star β Crucis. In so doing we confirm 40-year-old predictions of pulsation-induced polarization variability and its utility in asteroseismology for mode identification. In an approach suited to other β Cephei stars, we combine polarimetry with space-based photometry and archival spectroscopy to identify the dominant non-radial mode in polarimetry, f2, as mode degree ℓ = 3, azimuthal order m = −3 (in the m-convention of Dziembowski) and determine the stellar axis position angle as 25 (or 205) ± 8°. The rotation axis inclination to the line of sight was derived as ~46° from combined polarimetry and spectroscopy, facilitating identification of additional modes and allowing for asteroseismic modelling. This reveals a star of 14.5 ± 0.5 M⊙ and a convective core containing ~28% of its mass—making β Crucis the most massive star with an asteroseismic age. |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Funder | National Science Foundation |
Byline Affiliations | Monterey Institute for Research in Astronomy, United States |
Australian National University | |
Western Sydney University | |
Centre for Astrophysics | |
Florida Gulf Coast University, United States | |
Catholic University of Leuven, Belgium | |
Radboud University, Netherlands | |
Max Planck Society, Germany | |
University of New South Wales | |
University of California, United States | |
Royal Observatory of Belgium |
https://research.usq.edu.au/item/wz877/polarimetric-detection-of-non-radial-oscillation-modes-in-the-cephei-star-crucis
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