Magnetic activity in late-type giant stars: numerical MHD simulations of non-linear dynamo action in Betelgeuse

Bertil Dorch

doi:10.1051/0004-6361:20040435

Magnetic activity in late-type giant stars: numerical MHD simulations of non-linear dynamo action in Betelgeuse

Bertil Dorch

Unknown

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

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Abstrakt

Astronomy & Astrophysics

Originalsprog	Engelsk
Tidsskrift	Astronomy & Astrophysics
Vol/bind	423
Sider (fra-til)	1101-1107
ISSN	0004-6361
DOI	https://doi.org/10.1051/0004-6361:20040435
Status	Udgivet - 2004
Udgivet eksternt	Ja

Dokumenter og links

10.1051/0004-6361:20040435Licens: CC BY-NC-ND

Dorch 0403321v1Indsendt manuskript, 548 KBLicens: CC BY-NC-ND

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Preprint i arXiv.org

2 Foredrag og præsentationer i privat eller offentlig virksomhed

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23. apr. 2021 → 29. apr. 2021
Aktivitet: Foredrag og mundtlige bidrag › Foredrag og præsentationer i privat eller offentlig virksomhed
Den røde kæmpestjerne i Orion: Gigantisk, magnetisk, eksplosiv?
Bertil F. Dorch (Foredragsholder)
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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

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1 Mediebidrag
Presse/medie

Citationsformater

@article{99dac48c79b44c41b351a06024e4f6a7,

title = "Magnetic activity in late-type giant stars: numerical MHD simulations of non-linear dynamo action in Betelgeuse",

abstract = "Evidence is presented from numerical magneto-hydrodynamical simulations for the existence of magnetic activity in late-type giant stars. A red supergiant with stellar parameters similar to that of Betelgeuse (alpha Orionis) is modeled as a {"}star-in-a-box{"} with the high-order {"}Pencil Code{"}. Both linear kinematic and non-linear saturated dynamo action are found: the non-linear magnetic field saturates at a super-equipartition value (a factor two above equipartition yielding surface fields with strengths on the order of 500 Gauss), while in the linear regime two different modes of dynamo action are found. It is speculated that magnetic activity of late-type giants may influence dust and wind formation and possibly lead to the heating of the outer atmospheres of these stars.",

keywords = "Betelgeuse, Computer Simulation, Magnetisme",

author = "Bertil Dorch",

year = "2004",

doi = "10.1051/0004-6361:20040435",

language = "English",

volume = "423",

pages = "1101--1107",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "E D P Sciences",

}

TY - JOUR

T1 - Magnetic activity in late-type giant stars

T2 - numerical MHD simulations of non-linear dynamo action in Betelgeuse

AU - Dorch, Bertil

PY - 2004

Y1 - 2004

N2 - Evidence is presented from numerical magneto-hydrodynamical simulations for the existence of magnetic activity in late-type giant stars. A red supergiant with stellar parameters similar to that of Betelgeuse (alpha Orionis) is modeled as a "star-in-a-box" with the high-order "Pencil Code". Both linear kinematic and non-linear saturated dynamo action are found: the non-linear magnetic field saturates at a super-equipartition value (a factor two above equipartition yielding surface fields with strengths on the order of 500 Gauss), while in the linear regime two different modes of dynamo action are found. It is speculated that magnetic activity of late-type giants may influence dust and wind formation and possibly lead to the heating of the outer atmospheres of these stars.

AB - Evidence is presented from numerical magneto-hydrodynamical simulations for the existence of magnetic activity in late-type giant stars. A red supergiant with stellar parameters similar to that of Betelgeuse (alpha Orionis) is modeled as a "star-in-a-box" with the high-order "Pencil Code". Both linear kinematic and non-linear saturated dynamo action are found: the non-linear magnetic field saturates at a super-equipartition value (a factor two above equipartition yielding surface fields with strengths on the order of 500 Gauss), while in the linear regime two different modes of dynamo action are found. It is speculated that magnetic activity of late-type giants may influence dust and wind formation and possibly lead to the heating of the outer atmospheres of these stars.

KW - Betelgeuse

KW - Computer Simulation

KW - Magnetisme

UR - http://arxiv.org/abs/astro-ph/0403321

U2 - 10.1051/0004-6361:20040435

DO - 10.1051/0004-6361:20040435

M3 - Journal article

VL - 423

SP - 1101

EP - 1107

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

ER -

Magnetic activity in late-type giant stars: numerical MHD simulations of non-linear dynamo action in Betelgeuse

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Dokumenter og links

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