Article (Scientific journals)
Modelling the photometric variability of magnetic massive stars with the Analytical Dynamical Magnetosphere model
Munoz, M. S.; Wade, Gregg; Nazé, Yaël et al.
2020In Monthly Notices of the Royal Astronomical Society, 492 (1), p. 1199-1213
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Keywords :
Stars: individual:HD191612; Stars: massive; Stars: massloss; Stars:magnetic field
Abstract :
[en] In this paper, we investigate the photometric variability of magnetic O-type stars. Such stars possess oblique, predominantly dipolar magnetic fields that confine their winds roughly axisymmetrically about the magnetic equator, thus forming a magnetosphere. We interpret their photometric variability as phase-dependent magnetospheric occultations. For massive star winds dominated by electron scattering opacity in the optical and NIR, we can compute synthetic light curves from simply knowing themagnetosphere'smass density distribution.We exploit the newly developed Analytical Dynamical Magnetosphere (ADM) model in order to obtain the predicted circumstellar density structures of magnetic O-type stars. The simplicity in our light-curve synthesis model allows us to readily conduct a parameter space study. For validation purposes, we first apply our algorithm to HD 191612, the prototypical Of?p star. Next, we attempt to model the photometric variability of the Of?p-type stars identified in the Magellanic Clouds using OGLE photometry. We evaluate the compatibility of the ADM predictions with the observed photometric variations and discuss the magnetic field properties that are implied by our modelling. © 2019 The Author(s).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Munoz, M. S.;  Department of Physics,Engineering Physics and Astronomy, Queen's University, 64 Bader lane, Kingston, ON K7L 3N6, Canada
Wade, Gregg;  Department of Physics and Space Science, Royal Military College of Canada, PO Box 17000, Stn Forces, Kingston, ON K7K 7B4, Canada
Nazé, Yaël  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Puls, Joachim;  LMU München, Universitätssternwarte Scheinerstr. 1, München, D-81679, Germany
Bagnulo, Stefano;  Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9DG, United Kingdom
Szymánski, Michał K.;  Astronomical Observatory, University of Warsaw, Aleje Ujazdowskie 4, Warszawa, PL-00-478, Poland
Language :
English
Title :
Modelling the photometric variability of magnetic massive stars with the Analytical Dynamical Magnetosphere model
Publication date :
2020
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press
Volume :
492
Issue :
1
Pages :
1199-1213
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Belgian Federal Science Policy Office, BELSPOEuropean Space Agency, ESAMAESTRO2014/14/A/ST9/00121Natural Sciences and Engineering Research Council of Canada, NSERC
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since 11 March 2020

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