Spectropolarimetric study of the cool RV Tauri star R Scuti

• Main Authors: Tessore, Benjamin, Lebre, Agnès, Morin, Julien
• Other Authors: Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), F. Martins, S. Boissier, V. Buat, L. Cambrésy, P. Petit
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2015
• Subjects: stars: late-type; stars: R Sct; stars: magnetic field; line: profiles; polarisation; [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-01313039

National audience With the spectropolarimeter Narval at TBL we have initiated in spring 2015 a 2-year campaign dedicated to a sample of cool and evolved stars including pulsating RV Tauri stars. We monitor net circular and linear polarisation in the spectral lines of R Scuti, the brightest of such variable targets. Our aim is to study the surface magnetic field and the linear polarisation associated with specific spectral lines. We confirm a definite detection of the surface magnetic field of R Sct, with an average longitudinal component {B_ℓ = 0.9 ± 0.5 G}. We also unveil our first results on linear polarisation.