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

scholarly journals Dissecting the X-Ray Emission in the Young Planetary Nebula NGC 7027

2018 ◽  
Vol 861 (1) ◽  
pp. 45 ◽  
Author(s):  
Rodolfo Montez ◽  
Joel H. Kastner
Keyword(s):  
Planetary Nebula ◽  
X Ray ◽  
Ngc 7027

High‐Resolution X‐Ray Image of the Hydrogen‐deficient Planetary Nebula Abell 30

1997 ◽  
Vol 482 (2) ◽  
pp. 891-896 ◽  
Author(s):  
You‐Hua Chu ◽  
Thomas H. Chang ◽  
Gail M. Conway
Keyword(s):  
High Resolution ◽  
Planetary Nebula ◽  
X Ray

X-Ray Emission from the Pre-planetary Nebula Henize 3-1475

2003 ◽  
Vol 599 (2) ◽  
pp. L87-L90 ◽  
Author(s):  
Raghvendra Sahai ◽  
Joel H. Kastner ◽  
Adam Frank ◽  
Mark Morris ◽  
Eric G. Blackman
Keyword(s):  
Planetary Nebula ◽  
X Ray

Abundance Anomalies in the X‐Ray Spectra of Planetary Nebulae NGC 7027 and BD +30o3639

2003 ◽  
Vol 589 (1) ◽  
pp. 439-443 ◽  
Author(s):  
Holly L. Maness ◽  
Saeqa D. Vrtilek ◽  
Joel H. Kastner ◽  
Noam Soker
Keyword(s):  
Planetary Nebulae ◽  
X Ray ◽  
Ngc 7027 ◽  
Abundance Anomalies

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 X-ray emission from the planetary nebula NGC 1360

1985 ◽  
Vol 5 (3) ◽  
pp. 57-59 ◽  
Author(s):  
P.A.J. de Korte ◽  
J.J. Claas ◽  
F.A. Jansen ◽  
S.P. McKechnie
Keyword(s):  
Planetary Nebula ◽  
X Ray

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 HM Sagittae – A most remarkable star

1982 ◽  
Vol 70 ◽  
pp. 209-211
Author(s):  
Sun Kwok
Keyword(s):  
Planetary Nebula ◽  
Variable Star ◽  
Spectral Band ◽  
Gas Temperature ◽  
X Ray ◽  
The Galaxy

HM Sagittae is one of the most unusual objects in the Galaxy for it displays activity in every spectral band from x-ray to radio. Its present variable-star designation was given after the discovery of its optical brightening from 16m to 12m between April and September 1975 (Dokuchaeva and Balazs 1976). It was soon found to have a rich emissionline spectrum similar to that of a planetary nebula (Stover and Sivertsen 1977). Post-brightening monitoring of the object by Ciatti, Mammano and Vittone (1977, 1978) found the B and V magnitudes to be variable with amplitudes of at least one magnitude. Evidence for increasing excitation was found by Ciatti, Mammano and Vittone (1979) with Hell 4686 emerging in October 1978. Wolf-Rayet features of velocities up to 2000 km s-1 have also been seen (Belyakina, Gershberg and Shakhovskaya 1978, 1979; Brown et al. 1978; Ciatti et al. 1978; Wallerstein 1978; Allen 1980; Andrillat and Swings 1982). Analysis of the forbidden line ratios gives an estimated nebula density of 106-107 cm-3 and a gas temperature >104K (Ciatti et al. 1977; Arkhipova and Dokuchaeva 1978; Davidson, Humphreys and Merrill 1979; Arkhipova, Dokuchaeva and Esipov 1979).

REBIRTH OF X-RAY EMISSION FROM THE BORN-AGAIN PLANETARY NEBULA A30

2012 ◽  
Vol 755 (2) ◽  
pp. 129 ◽  
Author(s):  
M. A. Guerrero ◽  
N. Ruiz ◽  
W.-R. Hamann ◽  
Y.-H. Chu ◽  
H. Todt ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
X Ray ◽  
Born Again
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