Ionization structure and composition of the planetary nebula NGC 7027

1978 ◽  
Vol 219 ◽  
pp. 565 ◽  
Author(s):  
G. A. Shields
Keyword(s):  
Planetary Nebula ◽  
Ionization Structure ◽  
Ngc 7027

scholarly journals Revisiting the Formation of HeH+ in the Planetary Nebula NGC 7027

2020 ◽  
Vol 898 (1) ◽  
pp. 86
Author(s):  
R. C. Forrey ◽  
J. F. Babb ◽  
E. D. S. Courtney ◽  
R. T. McArdle ◽  
P. C. Stancil
Keyword(s):  
Planetary Nebula ◽  
Ngc 7027

scholarly journals Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027

2011 ◽  
Vol 7 (S283) ◽  
pp. 340-341 ◽  
Author(s):  
Ashkbiz Danehkar ◽  
David J. Frew ◽  
Quentin A. Parker ◽  
Orsola De Marco
Keyword(s):  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Ngc 7027

AbstractWe estimate distances to the spherical planetary nebula Abell 39 and the bipolar planetary nebula NGC 7027 by interpolating from a wide grid of photoionization models using the 3-D code, MOCASSIN. We find preliminary distances of 1.5 kpc and 0.9 kpc respectively, with uncertainties of about 30%.

scholarly journals Discovery of Extended X-Ray Emission from the Planetary Nebula NGC 7027 by the [ITAL]Chandra X-Ray Observatory[/ITAL]

2001 ◽  
Vol 550 (2) ◽  
pp. L189-L192 ◽  
Author(s):  
Joel H. Kastner ◽  
Saeqa D. Vrtilek ◽  
Noam Soker
Keyword(s):  
Planetary Nebula ◽  
X Ray ◽  
Ngc 7027

The Composition of the Planetary Nebula NGC 7027.

1954 ◽  
Vol 120 ◽  
pp. 401 ◽  
Author(s):  
Lawrence H. Aller
Keyword(s):  
Planetary Nebula ◽  
Ngc 7027

The spectrum of the planetary nebula NGC 7027 from 0.9 to 2.7 microns

1976 ◽  
Vol 209 ◽  
pp. 793 ◽  
Author(s):  
R. R. Treffers ◽  
U. Fink ◽  
H. P. Larson ◽  
T. N., III Gautier
Keyword(s):  
Planetary Nebula ◽  
Ngc 7027

scholarly journals A spatially resolved photodissociation region in the planetary nebula NGC 7027

1993 ◽  
Vol 105 ◽  
pp. 250 ◽  
Author(s):  
James R. Graham ◽  
E. Serabyn ◽  
T. M. Herbst ◽  
K. Matthews ◽  
G. Neugebauer ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
Spatially Resolved ◽  
Ngc 7027 ◽  
Photodissociation Region

scholarly journals A Theoretical Model of NGC 7027

1978 ◽  
Vol 76 ◽  
pp. 162-162
Author(s):  
Daniel Péquignot
Keyword(s):  
Exchange Rate ◽  
Charge Transfer ◽  
Theoretical Model ◽  
Charge Exchange ◽  
Physical Process ◽  
Transfer Reactions ◽  
Rate Coefficients ◽  
Ionization Structure ◽  
Ngc 7027 ◽  
Charge Transfer Reactions

It is demonstrated that ionization structure of NGC 7027 cannot be explained by static models based on the standard photoionization theory unless some complementary physical process is included. The main discrepancies are successfully eliminated by including charge transfer reactions with hydrogen for the following ions: C+, C+3, N+2, O+2, Ne+2, S+ and S+3, the rate coefficients being probably of the order of or larger than 10−9cm+3s−1 except for C+ and Ne+2; in addition the charge exchange rate for N+ is probably ∼200 times smaller than the value proposed by Steigman et al. (1971).

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