2005A&A...429..977W


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.19CET23:50:16

2005A&A...429..977W - Astronomy and Astrophysics, volume 429, 977-992 (2005/1-3)

Molecules in bipolar proto-planetary nebulae.

WOODS P.M., NYMAN L.-A., SCHOEIER F.L., ZIJLSTRA A.A., MILLAR T.J. and OLOFSSON H.

Abstract (from CDS):

Two bipolar proto-planetary nebulae, IRAS 16594-4656 and IRAS 17150-3224, have been detected in various molecular lines, namely CO, 13CO, HCN and CN, and remain undetected in several other species. CO(J=2-1) and CO(J=3-2) line profiles are compared to new spectra of similar PPN candidates, previously undetected in CO(J=2-1): CPD-53°5736, IRAS 17106-3046, IRAS 17245-3951 and IRAS 17441-2411. CO(J=2-1) maps of IRAS 16594-4656 and IRAS 17150-3224 show that both PPNe have little separation between blue, centre and red-shifted emission, and also that the CO(J=2-1) emission is of a similar size to the telescope beam. Fractional abundances of all detected molecules (except CO) are calculated using the results of CO line modelling and a simple photodissociation model. For those species not detected, upper limits are derived. Comparisons between these fractional abundances and those of other PPNe show that IRAS 16594-4656 and IRAS 17150-3224 are quite under-abundant when compared to molecule-rich sources like CRL618, CRL2688 and OH231.8+4.2. As a reason for this deficit, the difference in circumstellar envelope/torus density between the molecule-rich sources and the molecule-poor sources is proposed, and supported by a chemical model which follows the transition of a circumstellar envelope through the AGB phase and into the PPN phase of evolution. The model includes the effects of UV radiation, cosmic rays and also X-rays. Finally, the post-AGB ages of these two objects (200-400yr) are estimated using CN/HCN and HCN/CO ratios and both ages are found to be in agreement with previous figures cited in the literature, IRAS 17150-3224 being the younger of the two PPNe.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: AGB and post-AGB - stars: carbon - stars: circumstellar matter - stars: individual: IRAS 16594-4656 - stars: individual: IRAS 17150-3224

Simbad objects: 23

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Number of rows : 23

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 IRAS 04296+3429 pA* 04 32 56.9768181234 +34 36 12.505781495   16.20 14.21   11.64 G0Ia 135 0
2 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 946 0
3 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 711 0
4 HD 56126 pA* 07 16 10.2589670319 +09 59 47.953674864   9.20 8.32     F0/5Ia 302 0
5 PN M 1-16 PN 07 37 18.902 -09 38 47.96   12.7       ~ 174 0
6 OH 231.8 +4.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 500 1
7 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2115 0
8 THA 35-II-27 PN 10 19 32.501 -60 13 29.48     12.5     B:Ie 85 0
9 HD 101584 pA* 11 40 58.8052292556 -55 34 25.813187841 7.80 7.40 7.01     B8/9I/IIe 120 0
10 CD-53 5736 pA* 14 52 28.7256366499 -54 17 42.825571983   11.66 10.94     A0Ie 19 0
11 NAME Water Lily Nebula pA* 17 03 10.0710345261 -47 00 27.733590141           B7 82 0
12 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 495 0
13 IRAS 17106-3046 pA* 17 13 51.7998254727 -30 49 40.711007759           F5I 32 0
14 RAFGL 6815S pA* 17 18 19.8316623567 -32 27 21.376880888           G2I 144 0
15 IRAS 17245-3951 pA* 17 28 04.65 -39 53 44.3           ~ 35 0
16 RAFGL 5385 pA* 17 47 13.49 -24 12 51.4     15.6     F4I 72 0
17 * 89 Her pA* 17 55 25.1884459710 +26 02 59.970100296 5.36 5.70 5.36 5.06 4.94 F2Ibp 385 0
18 OH 17.7 -2.0 pA* 18 30 30.703 -14 28 57.04           ~ 132 1
19 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 218 0
20 Min 1-92 pA* 19 36 18.9292148675 +29 32 49.838032394 12.13 12.35 11.75 11.54   B0.5IV[e] 235 1
21 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 170 0
22 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 826 1
23 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2308 1

    Equat.    Gal    SGal    Ecl

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2020.02.19-23:50:16

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