Diffuse X-Ray Emission from the Hydrogen-deficient Planetary Nebula Abell 30

1995 ◽  
Vol 448 (2) ◽  
Author(s):  
You-Hua Chu ◽  
Ching-Hwa Ho
Keyword(s):  
Planetary Nebula ◽  
X Ray

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

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 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 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

The Effect of CNO Metal Abundances on the Soft X-Ray Emission from He Rich White Dwarfs

1989 ◽  
Vol 114 ◽  
pp. 202-205
Author(s):  
M.A. Barstow
Keyword(s):  
Effective Temperature ◽  
Planetary Nebula ◽  
White Dwarfs ◽  
X Ray ◽  
Metal Abundances

AbstractPredicted soft X-ray fluxes for model atmospheres containing varying concentrations of CNO metals are compared with those observed by EXOSAT for the planetary nebula nucleus K1-16. An effective temperature in the range ≈ 125000 − 180000K is determined for K1-16 and a limit on the concentration of CNO in the atmosphere (between 0.02 and 20 ×solar relative to He) obtained. Some comments on the application of the models to the apparently metal rich star H1504+65 are included.

scholarly journals Ablation and Wind Mass-Loading in the Born-Again Planetary Nebula A 30

2011 ◽  
Vol 7 (S283) ◽  
pp. 378-379
Author(s):  
Martín A. Guerrero ◽  
You-Hua Chu ◽  
Wolf-Rainer Hamann ◽  
Lidia Oskinova ◽  
Detlef Schönberner ◽  
...  
Keyword(s):  
Stellar Wind ◽  
Planetary Nebula ◽  
Central Star ◽  
Mass Loading ◽  
Diffuse Emission ◽  
X Ray ◽  
Thermal Pulse ◽  
Born Again

AbstractWe present XMM-Newton and Chandra observations of the born-again planetary nebula A 30. These X-ray observations reveal a bright unresolved source at the position of the central star whose X-ray luminosity exceeds by far the model expectations for photospheric emission and for shocks within the stellar wind. We suggest that a “born-again hot bubble” may be responsible for this X-ray emission. Diffuse X-ray emission associated with the petal-like features and one of the H-poor knots seen in the optical is also found. The weakened emission of carbon lines in the spectrum of the diffuse emission can be interpreted as the dilution of stellar wind by mass-loading or as the detection of material ejected during a very late thermal pulse.

A Compact X-Ray Source and Possible X-Ray Jets within the Planetary Nebula Menzel 3

2003 ◽  
Vol 591 (1) ◽  
pp. L37-L40 ◽  
Author(s):  
Joel H. Kastner ◽  
Bruce Balick ◽  
Eric G. Blackman ◽  
Adam Frank ◽  
Noam Soker ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
X Ray

scholarly journals Suzaku Reveals Helium-burning Products in the X-Ray-emitting Planetary Nebula BD +30 3639

2006 ◽  
Vol 647 (2) ◽  
pp. L131-L134 ◽  
Author(s):  
M. Murashima ◽  
M. Kokubun ◽  
K. Makishima ◽  
J. Kotoku ◽  
H. Murakami ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
Helium Burning ◽  
X Ray
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