Criss-cross Mapping of BD+30 3639: a New Kinematic Analysis Technique

We introduce a new method to analyze kinematic proper motion data. The method is called 'criss-cross' mapping. It emphasizes regions where proper motion vector extensions cross or converge. From a superposition of lines through the vectors a map is generated which helps to interpret the ki...

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Bibliographic Details
Published in:The Astronomical journal 2011-03, Vol.141 (3), p.76-jQuery1323898091348='48'
Main Authors: Steffen, Wolfgang, Koning, Nico
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DATA ANALYSIS
MATHEMATICAL METHODS AND COMPUTING
MOTION
NEBULAE
PLANETARY NEBULAE
PROPER MOTION
STARS
TENSORS
VECTORS
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Summary:We introduce a new method to analyze kinematic proper motion data. The method is called 'criss-cross' mapping. It emphasizes regions where proper motion vector extensions cross or converge. From a superposition of lines through the vectors a map is generated which helps to interpret the kinematic data. The new mapping technique is applied to the young planetary nebula BD+30 3639. The data are more than 200 internal proper motion measurements from Li et al. From the criss-cross mapping of BD+30 3639, we conclude that the kinematic center is approximately 0.5 arcsec off-set to the southeast from the central star. The mapping also shows evidence for a non-homologous expansion of the nebula that is consistent with a disturbance due to the bipolar molecular bullets.
ISSN:1538-3881
0004-6256
1538-3881
DOI:10.1088/0004-6256/141/3/76