A magnetic betelgeuse? Numerical simulations of non-linear dynamo action: 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA

S. B. F. Dorch

A magnetic betelgeuse? Numerical simulations of non-linear dynamo action: 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA

S. B. F. Dorch

Unknown

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning

Abstrakt

Udgivelsesdato: Jan 2004

Originalsprog	Engelsk
Tidsskrift	Symposium - International astronomical union
Vol/bind	219
Sider (fra-til)	656-660
ISSN	0074-1809
Status	Udgivet - 2004
Udgivet eksternt	Ja

Dokumenter og links

http://adsabs.harvard.edu/abs/2004IAUS..219..656D

1 Foredrag og præsentationer i privat eller offentlig virksomhed

Supernova! Fra Tycho Brahe til Betelgeuse
Bertil F. Dorch (Foredragsholder)
23. apr. 2021 → 29. apr. 2021
Aktivitet: Foredrag og mundtlige bidrag › Foredrag og præsentationer i privat eller offentlig virksomhed

1 Igangværende

MAGSTAR: Forskningstema 1: Astrofysisk magnetisme
Dorch, B., Nordlund, Å., Freytag, B., Archontis, V., Gudiksen, B. V. & Christensen, M. B. E.
10/04/2002 → …
Projekter: Projekt › Forskning

Citationsformater

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title = "A magnetic betelgeuse? Numerical simulations of non-linear dynamo action: 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA",

abstract = "Betelgeuse is an example of a cool super-giant displaying brightness fluctuations and irregular surface structures. Simulations by Freytag et al. (2002) of the convective envelope of the star have shown that the fluctuations in the star's luminosity may be caused by giant cell convection. A related question regarding the nature of Betelgeuse and supergiants in general is whether these stars may be magnetically active. If so, that may in turn also contribute to their variability. By performing detailed numerical simulations, I find that both linear kinematic and non-linear dynamo action are possible and that the non-linear magnetic field saturates at a value somewhat below equipartition: in the linear regime there are two modes of dynamo action.",

author = "Dorch, {S. B. F.}",

year = "2004",

language = "English",

volume = "219",

pages = "656--660",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Heinemann",

}

TY - JOUR

T1 - A magnetic betelgeuse? Numerical simulations of non-linear dynamo action

T2 - 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA

AU - Dorch, S. B. F.

PY - 2004

Y1 - 2004

N2 - Betelgeuse is an example of a cool super-giant displaying brightness fluctuations and irregular surface structures. Simulations by Freytag et al. (2002) of the convective envelope of the star have shown that the fluctuations in the star's luminosity may be caused by giant cell convection. A related question regarding the nature of Betelgeuse and supergiants in general is whether these stars may be magnetically active. If so, that may in turn also contribute to their variability. By performing detailed numerical simulations, I find that both linear kinematic and non-linear dynamo action are possible and that the non-linear magnetic field saturates at a value somewhat below equipartition: in the linear regime there are two modes of dynamo action.

AB - Betelgeuse is an example of a cool super-giant displaying brightness fluctuations and irregular surface structures. Simulations by Freytag et al. (2002) of the convective envelope of the star have shown that the fluctuations in the star's luminosity may be caused by giant cell convection. A related question regarding the nature of Betelgeuse and supergiants in general is whether these stars may be magnetically active. If so, that may in turn also contribute to their variability. By performing detailed numerical simulations, I find that both linear kinematic and non-linear dynamo action are possible and that the non-linear magnetic field saturates at a value somewhat below equipartition: in the linear regime there are two modes of dynamo action.

M3 - Journal article

VL - 219

SP - 656

EP - 660

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

SN - 1743-9213

ER -

A magnetic betelgeuse? Numerical simulations of non-linear dynamo action: 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA

Abstrakt

Dokumenter og links

Fingeraftryk

Relaterede Aktiviteter

Supernova! Fra Tycho Brahe til Betelgeuse

Relaterede Projekter

MAGSTAR: Forskningstema 1: Astrofysisk magnetisme

Citationsformater