The effect of a stellar magnetic variation on the jet velocity

Fabio De Colle, José Gracia, Gareth Murphy

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the protostar/disk system. A widely accepted theory for the presence of knots is related to the generation of internal working surfaces due to variations in the jet ejection velocity. In this paper we study the effect of variations in the inner disk-wind radius on the jet ejection velocity. We show that a small variation in the inner disk-wind radius produces a variation in the jet velocity large enough to generate the observed knots. We also show that the variation in the inner radius may be related to a variation of the stellar magnetic field. © 2008. The American Astronomical Society. All rights reserved.
Original languageEnglish
JournalAstrophysical Journal
Volume688
Issue number2
Pages (from-to)1137-1141
ISSN0004-637X
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Accretion, accretion disks
  • ISM: Herbig-Haro objects
  • ISM: jets and outflows
  • Stars: magnetic fields
  • Stars: pre-main sequence
  • Stars: winds, outflows

Cite this

De Colle, Fabio ; Gracia, José ; Murphy, Gareth. / The effect of a stellar magnetic variation on the jet velocity. In: Astrophysical Journal. 2008 ; Vol. 688, No. 2. pp. 1137-1141.
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abstract = "Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the protostar/disk system. A widely accepted theory for the presence of knots is related to the generation of internal working surfaces due to variations in the jet ejection velocity. In this paper we study the effect of variations in the inner disk-wind radius on the jet ejection velocity. We show that a small variation in the inner disk-wind radius produces a variation in the jet velocity large enough to generate the observed knots. We also show that the variation in the inner radius may be related to a variation of the stellar magnetic field. {\circledC} 2008. The American Astronomical Society. All rights reserved.",
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De Colle, F, Gracia, J & Murphy, G 2008, 'The effect of a stellar magnetic variation on the jet velocity', Astrophysical Journal, vol. 688, no. 2, pp. 1137-1141. https://doi.org/10.1086/592494

The effect of a stellar magnetic variation on the jet velocity. / De Colle, Fabio; Gracia, José; Murphy, Gareth.

In: Astrophysical Journal, Vol. 688, No. 2, 2008, p. 1137-1141.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The effect of a stellar magnetic variation on the jet velocity

AU - De Colle, Fabio

AU - Gracia, José

AU - Murphy, Gareth

PY - 2008

Y1 - 2008

N2 - Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the protostar/disk system. A widely accepted theory for the presence of knots is related to the generation of internal working surfaces due to variations in the jet ejection velocity. In this paper we study the effect of variations in the inner disk-wind radius on the jet ejection velocity. We show that a small variation in the inner disk-wind radius produces a variation in the jet velocity large enough to generate the observed knots. We also show that the variation in the inner radius may be related to a variation of the stellar magnetic field. © 2008. The American Astronomical Society. All rights reserved.

AB - Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the protostar/disk system. A widely accepted theory for the presence of knots is related to the generation of internal working surfaces due to variations in the jet ejection velocity. In this paper we study the effect of variations in the inner disk-wind radius on the jet ejection velocity. We show that a small variation in the inner disk-wind radius produces a variation in the jet velocity large enough to generate the observed knots. We also show that the variation in the inner radius may be related to a variation of the stellar magnetic field. © 2008. The American Astronomical Society. All rights reserved.

KW - Accretion, accretion disks

KW - ISM: Herbig-Haro objects

KW - ISM: jets and outflows

KW - Stars: magnetic fields

KW - Stars: pre-main sequence

KW - Stars: winds, outflows

U2 - 10.1086/592494

DO - 10.1086/592494

M3 - Journal article

VL - 688

SP - 1137

EP - 1141

JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -