2012A&A...548A..40C


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:49:33

2012A&A...548A..40C - Astronomy and Astrophysics, volume 548A, 40-40 (2012/12-1)

Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7 µm AIBs.

CARPENTIER Y., FERAUD G., DARTOIS E., BRUNETTO R., CHARON E., CAO A.-T., D'HENDECOURT L., BRECHIGNAC P., ROUZAUD J.-N. and PINO T.

Abstract (from CDS):

Carbonaceous cosmic dust is observed through infrared spectroscopy either in absorption or in emission. The details of the spectral features are believed to shed some light on its structure and finally enable the study of its life cycle. The goal is to combine several analytical tools in order to decipher the intimate nanostructure of some soot samples. Such materials provide interesting laboratory analogues of cosmic dust. In particular, spectroscopic and structural characteristics that help to describe the polyaromatic units embedded into the soot, including their size, morphology, and organisation are explored. Laboratory analogues of the carbonaceous interstellar and circumstellar dust were produced in fuel-rich low-pressure, premixed and flat flames. The soot particles were investigated by infrared absorption spectroscopy in the 2-15µm spectral region. Raman spectroscopic measurements and high-resolution transmission electron microscopy were performed, which offered complementary information to better delineate the intimate structure of the analogues. These laboratory analogues appeared to be mainly composed of sp2 carbon, with a low sp3 carbon content. A cross relation between the positions of the aromatic C=C bands at about 6.2 micron and the band at about 8 micron is shown to trace differences in shapes and structures of the polyaromatic units in the soot. Such effects are due to the defects of the polyaromatic structures in the form of non-hexagonal rings and/or aliphatic bridges. The role of these defects is thus observed through the 6.2 and 7.7µm aromatic infrared band positions, and a distinction between carriers composed of curved aromatic sheets and more planar ones can be inferred. Based on these nanostructural differences, a scenario of nanograin growth and evolution is proposed.

Abstract Copyright:

Journal keyword(s): astrochemistry - dust, extinction - ISM: general - infrared: ISM

Simbad objects: 26

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Number of rows : 26

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 GSC 04501-00166 pA* 01 04 45.5102402311 +79 26 46.354274761   11.04 10.87 10.85   B1.7Ibeq 69 0
2 IRAS 04296+3429 pA* 04 32 56.9768181234 +34 36 12.505781495   16.13 14.09 13.64 11.64 G0Ia 138 0
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 756 0
4 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 725 0
5 PN Vo 1 PN 06 59 26.4078328215 -79 38 47.129323563   16.7 15.8     [WC10] 94 0
6 HD 89353 pA* 10 18 07.5892879413 -28 59 31.194541133   5.76 5.53     B9.5Ib/II 289 0
7 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 673 1
8 HD 100764 Pe* 11 35 42.7476806995 -14 35 36.663269333   9.81 8.79 8.08 7.65 C-H2.5 99 0
9 IRAS 13416-6243 pA* 13 45 07.2570740611 -62 58 16.832906949           G1I 41 0
10 V* V854 Cen RC* 14 34 49.4088471574 -39 33 19.276531885   7.13 11.69     Ce 202 0
11 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 230 0
12 IRAS 16279-4757 pA* 16 31 38.7378047645 -48 04 05.640499647           M3II 39 0
13 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 251 0
14 IRAS 17347-3139 PN 17 38 00.61 -31 40 55.2           ~ 55 1
15 V* XX Oph ** 17 43 56.4967929636 -06 16 08.787105588 10.51 9.81 8.59     M5IIe+Aep 141 0
16 EM* MWC 922 Be* 18 21 16.059408 -13 01 25.68432     13.80 13.65   B[e] 85 0
17 PN M 2-43 PN 18 26 40.0469091191 -02 42 57.485078141     15.7     [WC7/8] 113 0
18 IRAS 18576+0341 s*b 19 00 10.89456 +03 45 47.1096           B8I 83 1
19 HD 179218 Ae* 19 11 11.2540715594 +15 47 15.632212730 7.55 7.476 7.39 7.25 7.21 A0Ve 225 0
20 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 925 0
21 IRAS 20000+3239 LP* 20 01 59.5132264530 +32 47 32.808847821   16.13 13.39 11.80 10.32 ~ 74 0
22 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 840 1
23 V* V448 Lac pA* 22 24 31.4284207830 +43 43 10.975183855 11.22 10.61 9.69     F7I 102 0
24 HD 235858 pA* 22 29 10.3755939027 +54 51 06.341145584   11.40 9.52 8.47 7.34 G5Ia 240 0
25 SH 2-159 Y*O 23 15 31.27440 +61 07 10.4450           ~ 176 2
26 IRAS 23304+6147 pA* 23 32 44.7854376478 +62 03 49.083515796   15.36 12.99 12.23 10.50 G2Ia 109 0

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2021.05.17-03:49:34

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