Query : 2011MNRAS.415..513P

2011MNRAS.415..513P - Mon. Not. R. Astron. Soc., 415, 513-524 (2011/July-3)

Optical and mid-infrared observations of the planetary nebula NGC 6781.


Abstract (from CDS):

Although the planetary nebula NGC 6781 appears to possess an elliptical morphology, its kinematic and emission characteristics are in many ways unusual, and it is possible that it may represent a bipolar source oriented close to the line of sight. We shall present deep imaging of this nebula in [O III]λ5007, Hα and [N II]λ6584, and using broad-band (F555W and F814W) filters centred at λ8269 and λ5252. These were taken with the 2.56-m Nordic Optical Telescope and Hubble Space Telescope. This is combined with mid-infrared (MIR) imaging and spectroscopy acquired with the Spitzer Space Telescope (Spitzer), and near-infrared spectroscopy deriving from the Infrared Space Observatory. These reveal details of the complex [N II] structure associated with extended shell emission, perhaps associated with highly inclined bipolar lobes. We also note the presence of narrow absorbing filaments and clumps projected against the surface of the envelope, components which may be responsible for much of the molecular emission. We point out that such clumps may be responsible for complex source structure in the MIR, and give rise to asymmetries in emission along the major axis of the source. Although most of the MIR H2v= 0–0 emission is clearly concentrated in the bright interior shell, we shall also find evidence for extended emission to the north and south, and determine rotational excitation temperatures of order ∼980 K.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): ISM: jets and outflows - ISM: lines and bands - planetary nebulae: individual: NGC 40 - infrared: ISM

CDS comments: In this reference, the studied object is NGC 6781, instead of NGC 40

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NGC 40 PN 00 13 01.0170260109 +72 31 19.032886305   11.63 11.46     [WC8] 596 2
2 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 507 0
3 NGC 6781 PN 19 18 28.085 +06 32 19.29     11.8     ~ 251 0
4 NGC 7026 PN 21 06 18.5721833093 +47 51 06.780221314   15.33 15.1     [WC3] 408 1
5 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2368 1

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