2010ApJ...725..990Z

Query : 2010ApJ...725..990Z

2010ApJ...725..990Z - Astrophys. J., 725, 990-1001 (2010/December-2)

A Spitzer/Infrared spectrograph spectral study of a sample of galactic carbon-rich proto-planetary nebulae.

ZHANG Y., KWOK S. and HRIVNAK B.J.

Abstract (from CDS):

Recent infrared spectroscopic observations have shown that proto-planetary nebulae (PPNs) are sites of active synthesis of organic compounds in the late stages of stellar evolution. This paper presents a study of Spitzer/Infrared Spectrograph spectra for a sample of carbon-rich PPNs, all except one of which show the unidentified 21 µm emission feature. The strengths of the aromatic infrared band, 21 µm, and 30 µm features are obtained by decomposition of the spectra. The observed variations in the strengths and peak wavelengths of the features support the model that the newly synthesized organic compounds gradually change from aliphatic to aromatic characteristics as stars evolve from PPNs to planetary nebulae.

Abstract Copyright: ∼

Journal keyword(s): circumstellar matter - infrared: stars - stars: AGB and post-AGB

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 IRAS 01005+7910 pA* 01 04 45.5109702912 +79 26 46.357116648   11.04 10.87 10.85   B1.7Ibeq 75 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 IRAS 04296+3429 pA* 04 32 56.9743899192 +34 36 12.459816288   16.13 14.09 13.64 11.64 G0Ia 149 0
5 IRAS 05113+1347 pA* 05 14 07.7664787608 +13 50 28.200887160   14.786 12.574 11.663 10.26 G5I 72 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 IRAS 05341+0852 pA* 05 36 55.0511076432 +08 54 08.656315452   15.37 13.45 12.95 11.43 F5I 126 0
8 IRAS 06530-0213 pA* 06 55 31.8205478808 -02 17 28.243142520   16.38 13.99 13.26   F5Ia 87 0
9 HD 51585 pA? 06 58 30.4066932552 +16 19 26.138751492   11.48 11.20     B:eI/BQ[] 82 0
10 HD 56126 pA* 07 16 10.2590823192 +09 59 47.954735376   9.20 8.32     F0/5Ia 330 0
11 IRAS 07430+1115 s*r 07 45 51.3968191368 +11 08 19.561606620   13.94 12.22 11.82 10.69 M2I 64 0
12 EM* AS 321 PN 18 47 03.9857595552 -11 41 11.952467520   15.47 14.67 15.06 13.86 ~ 36 1
13 BD-11 4747 * 18 47 04.8038873952 -11 41 02.249926728   12.04 11.26 11.08   A5V 19 1
14 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 976 0
15 IRAS 19477+2401 pA* 19 49 54.9088013304 +24 08 53.507444604       20.0   F4/7I 48 0
16 IRAS 20000+3239 LP* 20 01 59.5133268456 +32 47 32.799122916   16.13 13.39 11.80 10.32 ~ 84 0
17 NGC 7023 OpC 21 01 36.9 +68 09 48           ~ 739 0
18 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
19 [D75b] Em* 21-021 PN 21 29 58.4711786760 +51 04 00.323924520   15.66 14.20 13.89   O7(f)/[WC11] 259 0
20 V* V448 Lac pA* 22 24 31.4283564864 +43 43 10.978781916 11.22 10.61 9.69     F7I 115 0
21 IRAS 22574+6609 pA* 22 59 18.3496246536 +66 25 47.940897972       19.2   A1-6I 56 0
22 IRAS 23304+6147 pA* 23 32 44.7858431592 +62 03 49.090372272   15.36 12.99 12.23 10.50 G2Ia 121 0

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