Hot Gas in Planetary Nebulae You-Hua Chu Robert A. Gruendl Martín A. Guerrero Univ. of Illinois.
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Transcript of Hot Gas in Planetary Nebulae You-Hua Chu Robert A. Gruendl Martín A. Guerrero Univ. of Illinois.
![Page 1: Hot Gas in Planetary Nebulae You-Hua Chu Robert A. Gruendl Martín A. Guerrero Univ. of Illinois.](https://reader035.fdocuments.in/reader035/viewer/2022062500/56649d545503460f94a30461/html5/thumbnails/1.jpg)
Hot Gas in Planetary NebulaeHot Gas in Planetary Nebulae
You-Hua ChuYou-Hua Chu Robert A. Gruendl Robert A. Gruendl Martín A. Guerrero Martín A. Guerrero Univ. of Illinois Univ. of Illinois
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Hot Gas Expected in Interacting Winds
Fast wind is shocked to 107 - 108 KHot gas in bubble interior 106 KConduction layer 105 K
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Complications and Problems
• Fast stellar wind - isotropic? collimated? - constant velocity? - constant mass loss rate?
• Mixing with nebular gas - thermal evaporation - dynamic ablation - presence of magnetic field
• Non-equilibrium ionization - abundance, temperature, mass
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When we can’t get potatos, we eat yams…
(massive star bubbles)
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Interstellar and Circumstellar Bubbles
Low-mass RG, AGB CSPN
Slow wind Fast wind
Circumstellar Circumstellar
nebula bubble
Interstellar
bubble
Slow wind Fast wind
Massive RSG, LBV WR
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Circumstellar Bubble NGC 6888
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Chandra X-ray Image of NGC 6888
R: H G: [O III] B: X-rayGruendl, Guerrero, Chu 2003, in prep.
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Circumstellar Bubble S308
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XMM-Newton X-ray Image of S 308
HD 50896
* R: H G: [O III] B: X-rayChu et al. 2003, submitted
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X-ray Spectra of Hot Gas in WR Bubbles
NGC 6888 (Chandra) S 308 (XMM)
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X-ray Observations of Shocked Fast Wind
• Detection of hot gas associated with fast winds - 6 PNe, 2 WR bubbles, 2 superbubbles*
• Properties of the hot gas:
Te [106 K ] Ne [cm-3 ] LX [erg/s]
PN 2-3 106 100 1031 1032
WR 1-2 106 1 1034
SB 8 106 0.1 1033
(* Townsley et al. 2003, ApJ, in press - Rosette & Omega)
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Pressure-driven bubble with heat conduction at interface
Lx (obs) / Lx (expected) = 10-1 to 10-3
Adjust fast wind- wind velocity- mass loss rate
Reduce heatconduction
Dynamically mix nebular material
More observations are needed.
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and potato skins…
(105 K gas at the interface)
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FUSE - Nebular OVI Absorption IC 418NGC 2392
Stellar P Cygni profile; nebular O VI absorption
H H
1037
1032
1037
1032
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FUSE - Nebular OVI Emission
NGC 7009 NGC 6543
Stellar P Cygni profile; nebular O VI emission
Inside
Outside
Star
1032 1037
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FUSE - Nebular OVI Emission
NGC 7293 NGC 3132
No stellar P Cygni profile; No nebular O VI emission
10371032
O IO IC II
Star
Inside
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Hot gas is cool !!!