2016A&A...586A..57S


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.28CET10:55:02

2016A&A...586A..57S - Astronomy and Astrophysics, volume 586A, 57-57 (2016/2-1)

Hot bubbles of planetary nebulae with hydrogen-deficient winds. I. Heat conduction in a chemically stratified plasma.

SANDIN C., STEFFEN M., SCHOENBERNER D. and RUEHLING U.

Abstract (from CDS):

Heat conduction has been found a plausible solution to explain discrepancies between expected and measured temperatures in hot bubbles of planetary nebulae (PNe). While the heat conduction process depends on the chemical composition, to date it has been exclusively studied for pure hydrogen plasmas in PNe. A smaller population of PNe show hydrogen-deficient and helium- and carbon-enriched surfaces surrounded by bubbles of the same composition; considerable differences are expected in physical properties of these objects in comparison to the pure hydrogen case. The aim of this study is to explore how a chemistry-dependent formulation of the heat conduction affects physical properties and how it affects the X-ray emission from PN bubbles of hydrogen-deficient stars. We extend the description of heat conduction in our radiation hydrodynamics code to work with any chemical composition. We then compare the bubble-formation process with a representative PN model using both the new and the old descriptions. We also compare differences in the resulting X-ray temperature and luminosity observables of the two descriptions. The improved equations show that the heat conduction in our representative model of a hydrogen-deficient PN is nearly as efficient with the chemistry-dependent description; a lower value on the diffusion coefficient is compensated by a slightly steeper temperature gradient. The bubble becomes somewhat hotter with the improved equations, but differences are otherwise minute. The observable properties of the bubble in terms of the X-ray temperature and luminosity are seemingly unaffected.

Abstract Copyright:

Journal keyword(s): conduction - hydrodynamics - planetary nebulae: general - stars: AGB and post-AGB - stars: Wolf-Rayet - X-rays: stars

Status at CDS:  

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 40 PN 00 13 01.0170260109 +72 31 19.032886305   11.63 11.46     [WC8] 583 2
2 PN M 4-18 PN 04 25 50.8357219366 +60 07 12.778708522   14.22 13.96     [WC11] 169 0
3 WRAY 16-139 PN 13 52 30.6807824735 -66 23 26.576683632 12.57 13.26 13.18 13.52   [WC9] 153 0
4 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 226 0
5 PN K 2-16 PN 16 44 49.0523721067 -28 04 04.705394782   13.18 12.75     [WC11] 83 0
6 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 247 0
7 PN HuBi 1 PN 17 54 21.13 -15 55 52.0   15.42 14.90     [WC11] 81 0
8 PN SwSt 1 PN 18 16 12.2731488024 -30 52 07.796394989   12.1 11.10     [WC9/10] 277 0
9 PN M 2-43 PN 18 26 40.0469091191 -02 42 57.485078141     15.7     [WC7/8] 112 0
10 V* V348 Sgr pA* 18 40 19.9270532749 -22 54 29.388019146   12.1       B0/1?I?e 169 0
11 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 917 0
12 Hen 2-459 PN 20 13 57.8911274947 +29 33 55.867549868   14.10 12.67     [WC9] 93 0
13 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 226 0

    Equat.    Gal    SGal    Ecl

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2020.03.28-10:55:02

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