000005289 001__ 5289
000005289 005__ 20220128174619.0
000005289 0247_ $$2DOI$$a10.1038/s41550-021-01531-9
000005289 037__ $$aSCART-2021-0068
000005289 100__ $$aCotton, D.V.
000005289 245__ $$aPolarimetric detection of nonradial oscillation modes in β Crucis
000005289 260__ $$c2021
000005289 520__ $$aHere we report the detection of polarization variations due to non-radial modes in the β Cephei star β Crucis. In so doing we confirm 40-year-old predictions of pulsation-induced polarization variability and its utility in asteroseismology for mode identification. In an approach suited to other β Cephei stars, we combine polarimetry with space-based photometry and archival spectroscopy to identify the dominant non-radial mode in polarimetry, f_2, as mode degree l = 3, azimuthal order m = −3 (in the m-convention of Dziembowski) and determine the stellar axis position angle as 25 (or 205) ± 8°. The rotation axis inclination to the line of sight was derived as ~46° from combined polarimetry and spectroscopy, facilitating identification of additional modes and allowing for asteroseismic modelling. This reveals a star of 14.5 ± 0.5 M_⊙ and a convective core containing ~28% of its mass—making β Crucis the most massive star with an asteroseismic age.
000005289 594__ $$aNO
000005289 700__ $$aBuzasi, D.L.
000005289 700__ $$aAerts, C.
000005289 700__ $$aBailey, J.
000005289 700__ $$aBurssens, S.
000005289 700__ $$aPedersen, M.G.
000005289 700__ $$aStello, D.
000005289 700__ $$aKedziora-Chudczer, L.
000005289 700__ $$aDe Horta, A.
000005289 700__ $$aDe Cat, P.
000005289 700__ $$aLewis, F.
000005289 700__ $$aMalla, S.P.
000005289 700__ $$aWright, D.J.
000005289 700__ $$aBott, K.
000005289 773__ $$c154--164$$pNature Astronomy$$v6
000005289 8560_ $$fpeter.decat@observatoire.be
000005289 8564_ $$s2662622$$uhttp://publi2-as.oma.be/record/5289/files/Cotton2022_NatAst6_154.pdf
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000005289 905__ $$apublished in
000005289 980__ $$aREFERD