Hostname: page-component-7c8c6479df-ws8qp Total loading time: 0 Render date: 2024-03-28T21:02:44.465Z Has data issue: false hasContentIssue false

Narrow-band imaging of NGC 7026

Published online by Cambridge University Press:  25 May 2016

M. Robberto
Affiliation:
1Max Planck Institut für Astronomie, Heidelberg (D) 2Osservatorio Astronomico di Torino, Pino Torinese (I)
M. Stanghellini
Affiliation:
2Osservatorio Astronomico di Torino, Pino Torinese (I)
S. Ligori
Affiliation:
2Osservatorio Astronomico di Torino, Pino Torinese (I)
T. M. Herbst
Affiliation:
1Max Planck Institut für Astronomie, Heidelberg (D)
D. Thompson
Affiliation:
1Max Planck Institut für Astronomie, Heidelberg (D)

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

NGC 7026 is one of the most remarkable bipolar planetary nebulae in the northern sky. There is an increasing interest in sources of this kind, as they indicate that anisotropic outflow phenomena play a significant role in the final evolutionary stages of massive stars. To investigate the spatial distribution of the excitation conditions in this nebula, and to get information about the structure of the progenitor's red giant wind, we started a multi-wawelength survey taking high spatial resolution line images in the visible, near and mid-infrared range using the Calar Alto and UKIRT telescopes. The instruments used are the STScI optical coronograph (Paresce & Burrows, ESO Messanger 47, 1987), the MAGIC IR camera (Herbst et al., SPIE Proc. N.1946, p.605, 1993), and the new MPIA thermal IR imager MAX. We present here some preliminary results, which allows us to estimate the main physical parameters of the central star, to find evidence for significant shock emission at the polar regions of the nebula, and to reveal an unexpected deficit of H2 emission.

Type
IV. Envelopes
Copyright
Copyright © Kluwer 1997