Stellar magnetic fields in swollen convection zones

Marsden, S. C. and Donati, J. -F. and Petit, P. and Dunstone, N. J. and Jardine, M. and Carter, B. D. and Waite, I. A. and Semel, M. and Ramirez, J. (2009) Stellar magnetic fields in swollen convection zones. In: Astronomical Society of the Pacific Conference(SPW5): 5th Solar Polarization Workshop: a Workshop In Honor of Jan Olof Stenflo, 17-21 Sep 2007, Ascona, Switzerland.

[img]
Preview
Text (Accepted Version)
Marsden_Donati_Petit_Dunstone_Jardine_Carter_Waite_Semel_Ramirez_Velez_AV.pdf

Download (314Kb)
[img]
Preview
Text (Published Version)
Marsden_etal_ASP2009_PV.pdf

Download (342Kb)

Abstract

Solar magnetic activity is generated through dynamo action operating at the base of the solar convection zone. However, for rapidly rotating solar-type stars this might not be the case with magnetic images showing regions of near-surface azimuthal field indicating that the operation of dynamo may in fact be distributed throughout the entire convection zone. Here we present the first magnetic images of a pre-main sequence star with both components having swollen outer convection zones. These results are part of an international study to understand how the generation of magnetic fields is affected by basic stellar parameters such as mass, rotation rate, the depth of the stellar convection zone, and binarity. The magnetic images were obtained by observing the star in circularly polarised light and using the technique of Zeeman Doppler imaging.


Statistics for USQ ePrint 5791
Statistics for this ePrint Item
Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright 2009 Astronomical Society of the Pacific. This publication is copyright. It may be reproduced by an individual user in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Depositing User: Dr Brad Carter
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 19 Feb 2010 03:12
Last Modified: 23 Oct 2014 23:41
Uncontrolled Keywords: solar; stellar; magnetic fields; swollen convention zones
Fields of Research (FOR2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0204 Condensed Matter Physics > 020402 Condensed Matter Imaging
01 Mathematical Sciences > 0102 Applied Mathematics > 010299 Applied Mathematics not elsewhere classified
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
URI: http://eprints.usq.edu.au/id/eprint/5791

Actions (login required)

View Item Archive Repository Staff Only