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First results from the LIFE project: discovery of two magnetic hot evolved stars A.J. Martin 67266-0 C. Neiner 122682-0 M E Oksala 1341594-0 G A Wade 1341595-0 Z Keszthelyi 1341596-0 L Fossati 1341597-0 W. Marcolino 374233-0 S. Mathis 6cae403b528988cafba7ecca86023609 cea.fr 965920 318783-965920 https://orcid.org/0000-0001-9491-8012 C. Georgy 652076-0 Gestionnaire HAL 2 Sorbonne Université 020e196d7bdf24c37910f3b6e1311927 sorbonne-universite.fr 2018-04-03 16:31:04 2025-08-04 19:03:22 2018-04-03 16:35:11 2018 2018-04-03 contributor Gestionnaire HAL 2 Sorbonne Université 020e196d7bdf24c37910f3b6e1311927 sorbonne-universite.fr CCSD hal-01757363 https://hal.sorbonne-universite.fr/hal-01757363 martin:hal-01757363 <i>Monthly Notices of the Royal Astronomical Society</i>, 2018, 475 (2), pp.1521-1536. <a target="_blank" href="https://dx.doi.org/10.1093/mnras/stx3264">⟨10.1093/mnras/stx3264⟩</a> Monthly Notices of the Royal Astronomical Society, 2018, 475 (2), pp.1521-1536. ⟨10.1093/mnras/stx3264⟩ CC BY 4.0 - Attribution Observatoire de Paris CEA - Commissariat à l'énergie atomique INSU - Institut National des Sciences de l'Univers Université Denis Diderot - Paris VII CNRS - Centre national de la recherche scientifique Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique IRFU IRFU-AIM Université Paris sciences et lettres Université Sorbonne Paris Cité Direction de Recherche Fondamentale Sorbonne Université Sorbonne Université 01/01/2018 Faculté des Sciences de Sorbonne Université Université Paris Cité Université Paris Cité - Faculté des Sciences Observatoire de Paris - PSL Sorbonne Université - Texte Intégral Graduate School Physique Alliance Sorbonne Université Astronomie, astrophysique et physique des plasmas Laboratoire d’Instrumentation et de Recherche en Astrophysique International No Yes First results from the LIFE project: discovery of two magnetic hot evolved stars A.J. Martin 67266-0 C. Neiner 122682-0 M E Oksala 1341594-0 G A Wade 1341595-0 Z Keszthelyi 1341596-0 L Fossati 1341597-0 W. Marcolino 374233-0 S. Mathis 6cae403b528988cafba7ecca86023609 cea.fr 965920 318783-965920 https://orcid.org/0000-0001-9491-8012 C. Georgy 652076-0 27534 0035-8711 1365-2966 Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP): Policy P - Oxford Open Option A 475 2 1521-1536 2018 2017-12-20 1712.07403 2018MNRAS.475.1521M 10.1093/mnras/stx3264 English Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Journal articles Journal articles Journal articles

We present the initial results of the Large Impact of magnetic Fields on the Evolution of hot stars (LIFE) project. The focus of this project is the search for magnetic fields in evolved OBA giants and supergiants with visual magnitudes between 4 and 8, with the aim to investigate how the magnetic fields observed in upper main-sequence (MS) stars evolve from the MS until the late post-MS stages. In this paper, we present spectropolarimetric observations of 15 stars observed using the ESPaDOnS instrument of the Canada–France–Hawaii Telescope. For each star, we have determined the fundamental parameters and have used stellar evolution models to calculate their mass, age, and radius. Using the least-squared deconvolution technique, we have produced averaged line profiles for each star. From these profiles, we have measured the longitudinal magnetic field strength and have calculated the detection probability. We report the detection of magnetic fields in two stars of our sample: a weak field of Bl = 1.0 ± 0.2 G is detected in the post-MS A5 star 19 Aur and a stronger field of Bl = −230 ± 10 G is detected in the MS/post-MS B8/9 star HR 3042.

170794016 200212766X Laboratoire d'études spatiales et d'instrumentation en astrophysique LESIA (UMR_8109) 2019-12-31

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