2002A&A...394..679K


Query : 2002A&A...394..679K

2002A&A...394..679K - Astronomy and Astrophysics, volume 394, 679-690 (2002/11-1)

The mineral composition and spatial distribution of the dust ejecta of NGC 6302.

KEMPER F., MOLSTER F.J., JAEGER C. and WATERS L.B.F.M.

Abstract (from CDS):

We have analysed the full ISO spectrum of the planetary nebula NGC 6302 in order to derive the mineralogical composition of the dust in the nebula. We use an optically thin dust model in combination with laboratory measurements of cosmic dust analogues. We find two main temperature components at about 100 and 50K respectively, with distinctly different dust compositions. The warm component contains an important contribution from dust without strong infrared resonances. In particular the presence of small warm amorphous silicate grains can be excluded. The detection of weak PAH bands also points to a peculiar chemical composition of the dust in this oxygen-rich nebula. The cool dust component contains the bulk of the mass and shows strong emission from crystalline silicates, which contain about 10 percent of the mass. In addition, we identify the 92µm band with the mineral calcite, and argue that the 60µm band contains a contribution from the carbonate dolomite. We present the mass absorption coefficients of six different carbonate minerals. The geometry of the dust shell around NGC 6302 is studied with mid-infrared images obtained with TIMMI2. We argue that the cool dust component is present in a circumstellar dust torus, while the diffuse emission from the warm component originates from the lobes.

Abstract Copyright:

Journal keyword(s): planetary nebulae: individual: NGC 6302 - stars: circumstellar matter - dust, extinction - methods: laboratory

Simbad objects: 12

goto Full paper

goto View the references in ADS

Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 638 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
4 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 727 0
5 RAFGL 961 Y*O 06 34 37.741 +04 12 44.20           ~ 236 1
6 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 415 0
7 IRAS 09425-6040 C* 09 44 01.6685286753 -60 54 25.636690927     12.6     C 56 0
8 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 764 1
9 NGC 6537 PN 18 05 13.104 -19 50 34.88     13.58     ~ 415 1
10 W 33a Y*O 18 14 39.0 -17 52 03           ~ 599 0
11 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 264 0
12 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2368 1

To bookmark this query, right click on this link: simbad:objects in 2002A&A...394..679K and select 'bookmark this link' or equivalent in the popup menu


2021.09.17-17:56:01

© Université de Strasbourg/CNRS

    • Contact