Magneto-asteroseismic study of ι Lib

• Main Authors: Buysschaert, B., Neiner, Coralie, Aerts, C., White, T. R., Pope, B. J. S.
• Other Authors: Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Instituut voor Sterrenkunde Leuven, Catholic University of Leuven = Katholieke Universiteit Leuven (KU Leuven)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2018
• Subjects: stars: early-type; stars: magnetic field; stars: oscillations; stars: rotation; [SDU]Sciences of the Universe [physics]; [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]; [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]; narval
• Online Access: https://hal.science/hal-02323557

International audience About 10 % of early-type stars host a large-scale magnetic field, which is expected to affect their physical conditions. However, only a limited amount of observations exist to corroborate the extent of the effects of the large-scale magnetic field. Therefore, we searched for magnetic pulsating early-type stars, as the stellar pulsations provide an exclusive observational window to the internal stellar properties. In this work, we have analysed the ESPaDOnS and Narval spectropolarimetry to characterize the large-scale magnetic field of ι Lib and derive the star's rotation period. In addition, we investigated the K2 light curve of ι Lib with the aim to detect possible pulsation mode frequencies. Two of the low-amplitude frequencies fall in the frequency domain of g modes. However, more observations are needed to confirm these to be actual g modes and whether they originate from the magnetic early-type star in the ι Lib binary system.