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What do weak magnetic fields mean for magnetospheric accretion in Herbig AeBe star+disk systems?

Published online by Cambridge University Press:  07 August 2014

A. N. Aarnio ,
J. D. Monnier ,
T. J. Harries  and
D. M. Acreman
A. N. Aarnio
Affiliation:
Dept. of Astronomy, University of Michigan, 830 Dennison Building, 500 Church Street, Ann Arbor, MI, 48109, USA email: aarnio@umich.edu
J. D. Monnier
Affiliation:
Dept. of Astronomy, University of Michigan, 830 Dennison Building, 500 Church Street, Ann Arbor, MI, 48109, USA email: aarnio@umich.edu
T. J. Harries
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
D. M. Acreman
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
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Abstract

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In the presently favored picture of star formation, mass is transferred from disk to star via magnetospheric accretion and out of the system via magnetically driven outflows. This magnetically mediated mass flux is a fundamental process upon which the evolution of the star, disk, and forming planetary system depends. Our current understanding of these processes is heavily rooted in young solar analogs, T Tauri Stars (TTS). We have come to understand recently, however, that the higher mass pre-main sequence (PMS) Herbig AeBe (HAeBe) stars have dramatically weaker dipolar fields than their lower mass counterparts. We present our current observational and theoretical efforts to characterize magnetospherically mediated mass transfer within HAeBe star+disk systems. We have gathered a rich spectroscopic and interferometric data set for several dozen HAeBe stars in order to measure accretion and mass loss rates, assess wind and magnetospheric accretion properties, and determine how spectral lines and interferometric visibilities are diagnostic of these processes. For some targets, we have observed spectral line variability and will discuss ongoing time-series spectroscopic efforts.

Keywords

stars: emission lineBestars: evolutionstars: windsoutflowsstars: planetary systems: protoplanetary disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 80 - 83
Copyright
Copyright © International Astronomical Union 2014 

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