the 3d morphology of vy canis majoris: kinematics, polarimetry, …€¦ · kinematics,...
TRANSCRIPT
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
Minnesota IR GroupRichards et al. 1998 (Merlin)
Minnesota IR Group
SiO J = 1 – 0
Shinnaga et al. 2003
658nm HST image
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
Minnesota IR Group
Proper motions of selected clumps, arcs and features in the reflection nebulosity surrounding VYCMa
Minnesota IR Group
NW Arc500yrs
Arc 1800yrs
Arc 2 – 460yrs
SW Knots250yrs
S Knots160yrs
S Arc480yrs
Minnesota IR Group
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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NW Arc
Arc 1Arc 2
S Arc
Fractional Polarization
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?