2008A&A...490..189J


Query : 2008A&A...490..189J

2008A&A...490..189J - Astronomy and Astrophysics, volume 490, 189-196 (2008/10-4)

Carriers of the mid-IR emission bands in PNe reanalysed. Evidence of a link between circumstellar and interstellar aromatic dust.

JOBLIN C., SZCZERBA R., BERNE O. and SZYSZKA C.

Abstract (from CDS):

It has been shown that the diversity of the aromatic emission features can be rationalized into different classes of objects, in which differences between circumstellar and interstellar matter are emphasised. We probe the links between the mid-IR emitters observed in planetary nebulae (PNe) and their counterparts in the interstellar medium in order to probe a scenario in which the latter have been formed in the circumstellar environment of evolved stars. The mid-IR (6-14µm) emission spectra of PNe and compact HII regions were analysed on the basis of previous work on photodissociation regions (PDRs). Galactic, Large Magellanic Cloud (LMC), and Small Magellanic Cloud (SMC) objects were considered in our sample. We show that the mid-IR emission of PNe can be decomposed as the sum of six components. Some components made of polycyclic aromatic hydrocarbon (PAH) and very small grain (VSG) populations are similar to those observed in PDRs. Others are fitted in an evolutionary scenario involving the destruction of the aliphatic component observed in the post-AGB stage, as well as strong processing of PAHs in the extreme conditions of PNe that leads to a population of very large ionized PAHs. This species called PAHx are proposed as the carriers of a characteristic band at 7.90µm. This band can be used as part of diagnostics that identify PNe in nearby galaxies and is also observed in galactic compact HII regions. These results support the formation of the aromatic very small dust particles in the envelopes of evolved stars, in the Milky Way, as well as in the LMC and SMC, and their subsequent survival in the interstellar medium.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: carbon - ISM: planetray nebulae: general - infrared: ISM - methods: data analysis

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11228 1
2 LIN 239 PN 00 53 11.15 -72 45 07.6     16.432   17.873 ~ 35 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7127 0
4 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1002 0
5 LHA 120-N 77D HII 04 48 54.6681511104 -69 09 45.982366776           ~ 15 0
6 2MASS J04523254-6921442 * 04 52 32.54 -69 21 44.2   19.283 18.400     ~ 4 0
7 LHA 120-N 89 LP* 04 55 06.56376 -69 17 08.6784     19.60 18.53   ~ 24 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17555 0
9 MSX LMC 616 Y*O 05 28 04.830 -68 59 47.17 17.616 18.253 17.994 15.470 16.870 ~ 8 0
10 IRAS 05289-6617 C* 05 29 02.412 -66 15 27.77   22.276 21.353     C 25 0
11 IRAS 05312-7046S pA? 05 30 33.1706999016 -70 44 37.905626220 16.348 16.781 15.661 15.830 17.112 ~ 36 0
12 LHA 120-N 210 EmO 05 34 08.6150910000 -74 20 06.736997868   15.64   15.70 16.87 ~ 24 0
13 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 513 0
14 2MASX J05431974-6926264 As* 05 43 19.744 -69 26 26.48           ~ 5 0
15 LHA 120-N 221 PN 06 18 58.024 -71 35 50.52   16.05       ~ 44 0
16 PN Vo 1 PN 06 59 26.4167860656 -79 38 47.118534828           [WC10] 101 0
17 IRAS 13416-6243 pA* 13 45 07.2573421656 -62 58 16.835990124           G1I 45 0
18 WRAY 15-1269 PN 14 59 53.4819371136 -54 18 07.521138792 12.12 12.17 11.64 11.63   [WC11] 250 0
19 CPD-56 8032 PN 17 09 00.9291677740 -56 54 47.868280757 11.24 11.48 11.04 11.067   [WC11] 268 0
20 [WAM82] 023.955+0.152 HII 18 34 24.9 -07 54 50           ~ 70 1
21 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 118 1
22 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 956 0
23 SH 2-87 bub 19 46 20.69 +24 35 15.4           ~ 158 2
24 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 704 0
25 NAME Cave Nebula RNe 22 13 27 +70 15.3           ~ 55 0
26 HD 235858 pA* 22 29 10.3748806056 +54 51 06.344572284   11.40 9.52 8.47 7.34 G5Ia 255 0
27 SH 2-138 HII 22 32 45.7 +58 28 20           ~ 112 2
28 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 180 1

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