The 3D Morphology of VY Canis Majoris: Kinematics, Polarimetry, …€¦ · Kinematics,...
Transcript of The 3D Morphology of VY Canis Majoris: Kinematics, Polarimetry, …€¦ · Kinematics,...
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Minnesota IR Group
The 3D Morphology of VY Canis Majoris:Kinematics, Polarimetry, and the Line-of-
Sight Distribution of the Ejecta
Terry Jay Jones, Roberta M. Humphreys, and L. Andrew Helton – University of Minnesota
Changfeng Gui and Xiang Huang –University of Connectitcut
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Minnesota IR GroupRichards et al. 1998 (Merlin)
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Minnesota IR Group
SiO J = 1 – 0
Shinnaga et al. 2003
658nm HST image
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Minnesota IR Group
High resolution imaging with HST/WFPC2 in 2 epochs
High resolution spectroscopy (Keck)
Polarimetry with HST/ACS/HRC
Radial Velocities + Proper Motion = Total Motion
Polarimetry = Independent Placement in 3D
The Data Set
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Minnesota IR Group
Proper motions of selected clumps, arcs and features in the reflection nebulosity surrounding VYCMa
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Minnesota IR Group
NW Arc500yrs
Arc 1800yrs
Arc 2 – 460yrs
SW Knots250yrs
S Knots160yrs
S Arc480yrs
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Minnesota IR Group
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Minnesota IR Group
Total Intensity Photometric Color Fractional Polarization
Note: Most features in the intensity map are also distinctive in the fractional polarization map = distinct features
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Minnesota IR Group
NW Arc
Arc 1Arc 2
S Arc
Fractional Polarization
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Minnesota IR Group
Conclusions
• The arcs and knots appear to be separate geometric objects.
• They do not display any clear association with a simple bipolar outflow geometry.
• There is good agreement between the 3D geometry derived from two independent techniques.
• Some sort of magnetic phenomena near the star?