Infrared Observations of Magnetic Fields on Young Stars

Author(s):  
Jeff A. Valenti ◽  
Christopher M. Johns-Krull

2005 ◽  
Vol 618 (2) ◽  
pp. 795-809 ◽  
Author(s):  
Theodore Simon ◽  
S. E. Dahm




1987 ◽  
Vol 115 ◽  
pp. 71-74
Author(s):  
H. Zinnecker ◽  
A. Chelli ◽  
C. Perrier

High spatial resolution infrared observations (mostly at L, some at K) of several young stars in the ρ Oph dark cloud were obtained with the specklegraph at the ESO 3.6m telescope in Chile in July 1985. Sources included EL29, EL21, EL14 and EL9 (Elias 1978, Table 2), and were all measured in two orthogonal directions, W-E (PA=90°) and N-S (PA=180°). Here we shall present visibility functions for EL29 and EL21 and indicate the spatial structure and dimension of these objects. We refer to Elias (1978, p.468/69) for earlier studies of EL29 and EL21.



1997 ◽  
Vol 163 ◽  
pp. 799-800
Author(s):  
Craig H. Smith ◽  
Christopher M. Wright ◽  
David K. Aitken ◽  
Patrick F. Roche

AbstractWe present the results from mid-infrared spectro-polarimetric observations of a number of bi-polar outflow sources. The specto-polarimetric data provides information on the polarization mechanism and the magnetic field direction. The field direction in the disks of the observed sources is most often normal to the ambient field direction and lies in the plane of the disk, indicating a toroidal rather than poloidal field configuration.



1987 ◽  
Vol 320 ◽  
pp. 344 ◽  
Author(s):  
M. Simon ◽  
R. R. Howell ◽  
A. J. Longmore ◽  
B. A. Wilking ◽  
D. M. Peterson ◽  
...  


2020 ◽  
Vol 498 (4) ◽  
pp. 5684-5703 ◽  
Author(s):  
J-F Donati ◽  
D Kouach ◽  
C Moutou ◽  
R Doyon ◽  
X Delfosse ◽  
...  

ABSTRACT This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter/precision velocimeter recently installed on the 3.6-m Canada–France–Hawaii Telescope (CFHT). Starting from the two main science goals, i.e., the quest for planetary systems around nearby M dwarfs and the study of magnetized star/planet formation, we outline the instrument concept that was designed to efficiently address these forefront topics, and detail the in-lab and on-sky instrument performances measured throughout the intensive testing phase that SPIRou was submitted to before passing the final acceptance review in early 2019 and initiating science observations. With a central position among the newly started programmes, the SPIRou Legacy Survey (SLS) Large Programme was allocated 300 CFHT nights until at least mid 2022. We also briefly describe a few of the first results obtained in the various science topics that SPIRou started investigating, focusing in particular on planetary systems of nearby M dwarfs, transiting exoplanets and their atmospheres, magnetic fields of young stars, but also on alternate science goals like the atmospheres of M dwarfs and the Earth’s atmosphere. We finally conclude on the key role that SPIRou and the CFHT can play in coordination with forthcoming major facilities like the JWST, the ELTs, PLATO, and ARIEL over the decade.



2005 ◽  
Vol 160 (2) ◽  
pp. 469-502 ◽  
Author(s):  
F. Favata ◽  
E. Flaccomio ◽  
F. Reale ◽  
G. Micela ◽  
S. Sciortino ◽  
...  
Keyword(s):  


1993 ◽  
Vol 157 ◽  
pp. 171-175
Author(s):  
A.E. Dudorov

The theory of fossil magnetic fields shows that new born stars may have internal magnetic fields of more than 1 million gauss. Convection inside young solar type stars will tangle any strong fossil magnetic field. The small scale magnetic field rises to the surface and determines the young stars activity attenuating with their age. When a fossil field is diminished a turbulent dynamo may begin to work in the condition of nonlinear stabilization. The scaling relations for the turbulent αω dynamo show that the strength of the generated “fossil” magnetic field inside the main sequence stars is stabilized on the level one tenth — 10 millions gauss, depending on the mass of the stars.



1991 ◽  
Vol 147 ◽  
pp. 289-292
Author(s):  
Klaus-Werner Hodapp ◽  
John Rayner ◽  
Hua Chen

Clusters of young stars have been found near a number of compact HII regions. These clusters do not show a turnover in the K-band luminosity and are probably several million years old. In L 1641 only moderate clustering tendency has been observed and many sources show signs of extremely young age.



2013 ◽  
Vol 552 ◽  
pp. A14 ◽  
Author(s):  
H. Ohlendorf ◽  
T. Preibisch ◽  
B. Gaczkowski ◽  
T. Ratzka ◽  
J. Ngoumou ◽  
...  


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