2008A&A...486..221Z


Query : 2008A&A...486..221Z

2008A&A...486..221Z - Astronomy and Astrophysics, volume 486, 221-228 (2008/7-4)

Emission line profiles as a probe of physical conditions in planetary nebulae.

ZHANG Y.

Abstract (from CDS):

We present an analysis of physical conditions in planetary nebulae (PNe) in terms of collisionally-excited line (CEL) and optical-recombination line (ORL) profiles. We aim to investigate whether line profiles could be used to study the long-standing CEL/ORL abundance-discrepancy problem in nebular astrophysics. Using 1D photoionization models and their assumed velocity fields, we simulate the line profiles of various ionic species. We attempt to use our model to account for the observed CEL and ORL profiles. As a case study we present a detailed study of line profiles of the low-excitation planetary nebula (PN) IC 418. Our results show that the profiles of classical temperature and density diagnostic lines, such as [OIII] λλ4363, 5007, [SII] λλ6716, 6731, and [ArIV] λλ4711, 4740, provide a powerful tool to study nebular temperature and density variations. The method enables the CEL/ORL abundance-discrepancy problem to be studied more rigorously than before. A pure photoionization model of a chemically-homogeneous nebula seems to explain the observed disagreements in the profiles for the [OIII] λ4363 and the λ5007 lines, but cannot account for the differences between the [OIII] CELs and the OII ORLs. We also investigate the temperature and density variations in the velocity space of a sample of PNe, which are found to be insignificant.

Abstract Copyright:

Journal keyword(s): ISM: planetary nebulae: general - line: profiles

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 IC 418 PN 05 27 28.2059533560 -12 41 50.282287764   9.405 9.010 10.118   O7fp 1031 2
2 NGC 2440 PN 07 41 55.4 -18 12 32   11.469 10.104     ~ 653 2
3 IC 2501 PN 09 38 47.1901701864 -60 05 30.807638520   11.7 10     O3-6 181 0
4 IC 4191 PN 13 08 47.3071977936 -67 38 37.542860628   10.32 11.61     ~ 138 0
5 NGC 5307 PN 13 51 03.2580878376 -51 12 20.835744984   11.5 10     O3.5V 176 0
6 NGC 5315 PN 13 53 56.9726795664 -66 30 50.859483264   14.58 14.40     [WO4] 309 0
7 NGC 6153 PN 16 31 30.5708444544 -40 15 12.646208700   10.7 15.55     ~ 303 0
8 PN Hf 2-2 PN 18 32 30.9015918072 -28 43 20.276106312     15.90     ~ 96 0
9 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 996 1

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