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New observations of the halo radial temperature structure in NGC 7662

Published online by Cambridge University Press:  15 December 2006

C. Sandin ,
D. Schönberner ,
M. M. Roth ,
M. Steffen ,
A. Monreal-Ibero ,
P. Böhm  and
U. Tripphahn
C. Sandin
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
D. Schönberner
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
M. M. Roth
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
M. Steffen
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
A. Monreal-Ibero
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
P. Böhm
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
U. Tripphahn
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: CSandin@aip.de
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Abstract

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We report on our studies of the physical structure of the planetary nebula (PN) NGC 7662. Using (3D) Integral Field Spectroscopy we have been able to measure the electron temperature more accurately and at a larger number of radial locations than before. Here we briefly present our method by which we find a strong positive temperature gradient with increasing radius. According to hydrodynamic models a hot halo, when compared to the central star, can be the product of the passage of an ionization front (e.g. Marten 1993). Such a gradient is not found in equilibrium models, and this finding – when confirmed for other objects – strongly advocates the use of hydrodynamic models when modeling PN halos.

Keywords

hydrodynamicsinstrumentation: spectrographsmethods: data analysistechniques: spectroscopic(ISM:) planetary nebulae: individual (NGC 7662)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 501 - 502
Copyright
© 2006 International Astronomical Union