First results from the LIFE project: discovery of two magnetic hot evolved stars

被引：23

作者：

Martin, A. J. ^{[1
]}

Neiner, C. ^{[1
]}

Oksala, M. E. ^{[1
,2
]}

Wade, G. A. ^{[3
]}

Keszthelyi, Z. ^{[3
,4
]}

Fossati, L. ^{[5
]}

Marcolino, W. ^{[6
]}

Mathis, S. ^{[1
,7
]}

Georgy, C. ^{[8
]}

机构：

[1] Univ Paris Diderot, UPMC Univ Paris 06, Sorbonne Univ,Observ Paris, PSL Res Univ,CNRS,Sorbonne Paris Cite,LESIA, 5 Pl Jules Janssen, F-92195 Meudon, France

[2] Calif Lutheran Univ, Dept Phys, 60 West Olsen Rd 3700, Thousand Oaks, CA 91360 USA

[3] Royal Mil Coll Canada, Dept Phys & Space Sci, Stn Forces, POB 17000, Kingston, ON K7K 7B4, Canada

[4] Queens Univ, Dept Phys Engn Phys & Astron, 99 Univ Ave, Kingston, ON K7L 3N6, Canada

[5] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria

[6] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, Brazil

[7] Univ Paris Diderot, CNRS, CEA DRF, IRFU DAp Ctr Saclay,Lab AIM Paris Saclay, F-91191 Gif Sur Yvette, France

[8] Univ Geneva, Geneva Observ, Chemin Maillettes 51, CH-1290 Sauverny, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 475卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 欧洲研究理事会;

关键词：

techniques: polarimetric; techniques: spectroscopic; stars: early-type; stars: evolution; stars: magnetic field; supergiants; DRIVEN STELLAR WINDS; B-TYPE SUPERGIANTS; A-TYPE; DYNAMICAL SIMULATIONS; ROTATIONAL VELOCITIES; MASSIVE STARS; PRESUPERNOVA EVOLUTION; FUNDAMENTAL PARAMETERS; MIMES SURVEY; FIELD;

D O I：

10.1093/mnras/stx3264

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 B-1 = 1.0 +/- 0.2G is detected in the post-MS A5 star 19 Aur and a stronger field of B-1 =-230 +/- 10G is detected in the MS/post-MS B8/9 star HR3042.

引用

页码：1521 / 1536

页数：16

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