2001A&A...370.1030H


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST14:29:51

2001A&A...370.1030H - Astronomy and Astrophysics, volume 370, 1030-1043 (2001/5-2)

The CH out-of-plane bending modes of PAH molecules in astrophysical environments.

HONY S., VAN KERCKHOVEN C., PEETERS E., TIELENS A.G.G.M., HUDGINS D.M. and ALLAMANDOLA L.J.

Abstract (from CDS):

We present 10-15µm spectra of a sample of H II regions, YSOs and evolved stars that show strong unidentified infrared emission features, obtained with the ISO/SWS spectrograph on-board ISO. These spectra reveal a plethora of emission features with bands at 11.0, 11.2, 12.0, 12.7, 13.5 and 14.2µm. These features are observed to vary considerably in relative strength to each-other from source to source. In particular, the 10-15µm spectra of the evolved stars are dominated by the 11.2µm band while for H II regions the 12.7 is typically as strong as the 11.2µm band. Analysing the ISO data we find a good correlation between the 11.2µm band and the 3.3µm band, and between the 12.7µm and the 6.2µm band. There is also a correlation between the ratio of the UIR bands to the total dust emission and the 12.7 over 11.2µm ratio. Bands in the 10-15µm spectral region are due to CH out-of-plane (OOP) bending modes of polycyclic aromatic hydrocarbons (PAHs). We summarise existing laboratory data and theoretical quantum chemical calculations of these modes for neutral and cationic PAHs. Due to mode coupling, the exact peak position of these bands depends on the number of adjacent CH groups and hence the observed interstellar 10-15µm spectra can be used to determine the molecular structure of the interstellar PAHs emitting in the different regions. We conclude that evolved stars predominantly inject compact 100-200 C-atom PAHs into the ISM where they are subsequently processed, resulting in more open and uneven PAH structures.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: pre-main sequence - H II regions - ISM: molecules - - planetary nebulae: general - infrared: ISM: lines and bands

Simbad objects: 32

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Number of rows : 32

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 HHL 5 HII 03 07 24.2 +58 30 45           ~ 143 0
2 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 127 0
3 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
4 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 718 0
5 PN Vo 1 PN 06 59 26.4078328215 -79 38 47.129323563   16.7 15.8     [WC10] 94 0
6 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 459 0
7 IRAS 12405-6238 HII 12 43 31.752 -62 55 09.84           ~ 23 0
8 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 228 0
9 IRAS 15384-5348 HII 15 42 17.787 -53 58 30.88           ~ 36 1
10 CD-42 11721 Be* 16 59 06.7622892572 -42 42 08.404916931 12.16 12.28 11.00     B0IVe 155 1
11 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 249 0
12 PN Hb 5 PN 17 47 56.20 -29 59 39.6   10.50 10.78     ~ 252 0
13 NGC 6537 PN 18 05 13.104 -19 50 34.88     13.58     ~ 410 1
14 NAME GGD 27-ILL SFR 18 19 12.00 -20 47 31.1           ~ 16 1
15 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 123 0
16 PN M 2-43 PN 18 26 40.0469091191 -02 42 57.485078141     15.7     [WC7/8] 113 0
17 [WAM82] 023.955+0.152 HII 18 34 24.9 -07 54 50           ~ 70 1
18 GRS G028.29 -00.37 HII 18 44 18.6 -04 17 53           ~ 37 0
19 [WWB83] G033.91+0.11 HII 18 52 50.4 +00 55 29           ~ 89 1
20 V* TY CrA Ae* 19 01 40.8312189956 -36 52 33.801844387 10.03 9.92 9.39     B9e 268 0
21 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 920 0
22 SH 2-87 HII 19 46 20.7 +24 35 15           ~ 152 2
23 BD+40 4124 Ae* 20 20 28.2415737117 +41 21 51.527810947 11.11 11.36 10.62 10.510   B2Ve 275 1
24 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 157 1
25 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 410 2
26 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 631 0
27 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2327 1
28 IRAS 21190+5140 HII 21 20 44.8 +51 53 28           ~ 128 2
29 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 227 0
30 SH 2-138 HII 22 32 45.7 +58 28 20           ~ 106 2
31 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 166 1
32 SH 2-159 Y*O 23 15 31.27440 +61 07 10.4450           ~ 176 2

    Equat.    Gal    SGal    Ecl

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2020.08.14-14:29:51

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