Hostname: page-component-5cf477f64f-rdph2 Total loading time: 0 Render date: 2025-03-28T05:02:04.376Z Has data issue: false hasContentIssue false

The origin of magnetic fields in hot stars

Published online by Cambridge University Press: 24 July 2015

Coralie Neiner
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: coralie.neiner@obspm.fr
Stéphane Mathis
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: coralie.neiner@obspm.frLaboratoire AIM Paris-Saclay, CEA/DSM - CNRS - Université Paris Diderot, IRFU/SAp Centre de Saclay, 91191 Gif-sur-Yvette, France
Evelyne Alecian
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: coralie.neiner@obspm.frUJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041 Grenoble, France
Constance Emeriau
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/DSM - CNRS - Université Paris Diderot, IRFU/SAp Centre de Saclay, 91191 Gif-sur-Yvette, France
Jason Grunhut
Affiliation:
ESO, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
Save PDF (0.18 mb)View PDF[Opens in a new window]
Rights & Permissions[Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Observations of stable mainly dipolar magnetic fields at the surface of ~7% of single hot stars indicate that these fields are of fossil origin, i.e. they descend from the seed field in the molecular clouds from which the stars were formed. The recent results confirm this theory. First, theoretical work and numerical simulations confirm that the properties of the observed fields correspond to those expected from fossil fields. They also showed that rapid rotation does not modify the surface dipolar magnetic configurations, but hinders the stability of fossil fields. This explains the lack of correlation between the magnetic field properties and stellar properties in massive stars. It may also explain the lack of detections of magnetic fields in Be stars, which rotate close to their break-up velocity. In addition, observations by the BinaMIcS collaboration of hot stars in binary systems show that the fraction of those hosting detectable magnetic fields is much smaller than for single hot stars. This could be related to results obtained in simulations of massive star formation, which show that the stronger the magnetic field in the original molecular cloud, the more difficult it is to fragment massive cores to form several stars. Therefore, more and more arguments support the fossil field theory.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Alecian,E.,Neiner,C.,Wade,G. A.,et al.2015, in:New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry, Vol. 307 ofIAU Symposium, p. 330Google Scholar
Alecian,E.,Wade,G. A.,Catala,C.,et al.2013,MNRAS429,1001Google Scholar
Arlt,R. &Rüdiger,G.2011,MNRAS412,107Google Scholar
Aurière,M.,Wade,G. A.,Silvester,J.,et al.2007,A&A475,1053Google Scholar
Braithwaite,J.2006,A&A449,451Google Scholar
Braithwaite,J.2009,MNRAS397,763CrossRefGoogle Scholar
Braithwaite,J. &Cantiello,M.2013,MNRAS428,2789Google Scholar
Braithwaite,J. &Nordlund,Å.2006,A&A450,1077Google Scholar
Braithwaite,J. &Spruit,H. C.2004,Nature431,819Google Scholar
Brun,A. S.2007,AN328,1137Google Scholar
Brun,A. S.,Browning,M. K., &Toomre,J.2005,ApJ629,461Google Scholar
Brun,A. S.,Miesch,M. S., &Toomre,J.2004,ApJ614,1073Google Scholar
Cantiello,M. &Braithwaite,J.2011,A&A534,A140Google Scholar
Charbonneau,P.2010,Living Reviews in Solar Physics7,3Google Scholar
Charbonneau,P. &MacGregor,K. B.2001,ApJ559,1094Google Scholar
Commerçon,B.,Hennebelle,P., &Henning,T.2011,Ap. Lett.742,L9Google Scholar
Duez,V.,Braithwaite,J., &Mathis,S.2010,Ap. Lett.724,L34Google Scholar
Duez,V. &Mathis,S.2010,A&A517,A58Google Scholar
Emeriau,C. &Mathis,S.2015, in:New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry, Vol. 307 ofIAU Symposium, p. 373Google Scholar
Featherstone,N. A.,Browning,M. K.,Brun,A. S., &Toomre,J.2009,ApJ705,1000Google Scholar
Grunhut,J. H.,Rivinius,T.,Wade,G. A.,et al.2012,MNRAS419,1610CrossRefGoogle Scholar
Jouve,L.,Gastine,T., &Lignières,F.2015,A&A575,A106Google Scholar
Lignières,F.,Petit,P.,Aurière,M.,Wade,G. A., &Böhm,T.2014, in:Magnetic Fields throughout Stellar Evolution, Vol. 302 ofIAU Symposium, p. 338Google Scholar
Lignières,F.,Petit,P.,Böhm,T., &Aurière,M.2009,Astron. Lett.500,L41Google Scholar
MacGregor,K. B. &Cassinelli,J. P.2003,ApJ586,480Google Scholar
Markey,P. &Tayler,R. J.1973,MNRAS163,77Google Scholar
Matt,S. P.,MacGregor,K. B.,Pinsonneault,M. H., &Greene,T. P.2012,Ap. Lett.754,L26Google Scholar
Mestel,L.1999,Stellar magnetism,Oxford:Clarendon; International series of monographs on physicsGoogle Scholar
Neiner,C.,Alecian,E., &Mathis,S.2011, in:Alecian,G.,Belkacem,K.,Samadi,R., &Valls-Gabaud,D. (eds.),SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, p. 509Google Scholar
Neiner,C. &Alecian,E.,the BinaMIcS collaboration2013, in:Pavlovski,K.,Tkachenko,A., &Torres,G. (eds.),Setting a New Standard in the Analysis of Binary Stars, Vol. 64 ofEAS Publications Series, p. 75Google Scholar
Oksala,M. E.,Wade,G. A.,Marcolino,W. L. F.,et al.2010,MNRAS405,L51Google Scholar
Petit,P.,Lignières,F.,Aurière,M.,et al.2011,Astron. Lett.532,L13Google Scholar
Petit,P.,Lignières,F.,Wade,G. A.,et al.2010,A&A523,A41Google Scholar
Power,J.2007, Master's thesis, Queen's University, CanadaGoogle Scholar
Réville,V.,Brun,A. S.,Matt,S. P.,Strugarek,A., &Pinto,R. F.2015,ApJ798,116Google Scholar
Rüdiger,G.,Kitchatinov,L. L., &Elstner,D.2012,MNRAS425,2267Google Scholar
Spruit,H. C.2002,A&A381,923Google Scholar
Tayler,R. J.1973,MNRAS161,365Google Scholar
Wade,G. A.,Grunhut,J.,Alecian,E.,et al.2014a, in:Magnetic Fields throughout Stellar Evolution, Vol. 302 ofIAU Symposium, p. 265Google Scholar
Wade,G. A.,Petit,V.,Grunhut,J., &Neiner,C.2014b,ArXiv e-prints 1411.6165Google Scholar
Wolff,S. C.1968,PASP80,281Google Scholar
Zahn,J.-P.,Brun,A. S., &Mathis,S.2007,A&A474,145Google Scholar
You have Access