2012MNRAS.420.1977R


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST13:31:17

2012MNRAS.420.1977R - Mon. Not. R. Astron. Soc., 420, 1977-1989 (2012/March-1)

Optical and infrared imaging and spectroscopy of the multiple-shell planetary nebula NGC 6369.

RAMOS-LARIOS G., GUERRERO M.A., VAZQUEZ R. and PHILLIPS J.P.

Abstract (from CDS):

NGC 6369 is a double-shell planetary nebula consisting of a bright annular inner shell with faint bipolar extensions and a filamentary envelope. We have used ground- and space-based narrow-band optical and near-infrared (near-IR) images, broad-band mid-IR images, optical long-slit echelle spectra and mid-IR spectra to investigate its physical structure. These observations indicate that the inner shell of NGC 6369 can be described as a barrel-like structure shape with polar bubble-like protrusions, and reveal evidence for H2 and strong polycyclic aromatic hydrocarbons emission from a photodissociative region (PDR) with molecular inclusions located outside the bright inner shell. High-resolution Hubble Space Telescope narrow-band images reveal an intricate excitation structure of the inner shell and a system of `cometary' knots. The knotty appearance of the envelope, the lack of kinematical evidence for shell expansion and the apparent presence of emission from ionized material outside the PDR make us suggest that the envelope of NGC 6369 is not a real shell, but a flattened structure at its equatorial regions. We report the discovery of irregular knots and blobs of diffuse emission in low-excitation and molecular line emission that are located up to 80 arcsec from the central star, well outside the main nebular shells. We also show that the filaments associated to the polar protrusions have spatial extents consistent with post-shock cooling regimes, and likely represent regions of interaction of these structures with surrounding material.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): ISM: jets and outflows - ISM: lines and bands - planetary nebulae: individual: NGC 6369 - infrared: ISM

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 2392 PN 07 29 10.7669120392 +20 54 42.478515772     9.68     O6f 702 1
2 PN Fg 1 PN 11 28 36.2238250551 -52 56 04.118262147   13.1 12.20     ~ 161 0
3 NGC 3918 PN 11 50 17.7723407998 -57 10 57.059135256   10.0 8.5     ~ 366 0
4 PN MyCn 18 PN 13 39 35.0560904148 -67 22 51.758576199   13.30 12.54 13.19 12.61 ~ 269 1
5 IC 4406 PN 14 22 26.1443764953 -44 09 02.205426646   11.5 10.90     ~ 269 0
6 IC 4593 PN 16 11 44.5480003321 +12 04 17.033164436   10.91 10.84     O7fp 441 0
7 IC 4634 PN 17 01 33.5805836298 -21 49 33.002375687   12.3 11.3     O3If 266 0
8 NGC 6369 PN 17 29 20.4566547788 -23 45 34.771598164   16.6 12.00     [WC4] 304 0
9 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
10 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 797 2
11 NGC 7354 PN 22 40 19.8738736066 +61 17 08.744408285           ~ 267 2

    Equat.    Gal    SGal    Ecl

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2021.04.14-13:31:17

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