2001A&A...367..674C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST15:40:03

2001A&A...367..674C - Astronomy and Astrophysics, volume 367, 674-693 (2001/2-4)

Low-excitation atomic gas around evolved stars. II. ISO observations of O-rich nebulae.

CASTRO-CARRIZO A., BUJARRABAL V., FONG D., MEIXNER M., TIELENS A.G.G.M., LATTER W.B. and BARLOW M.J.

Abstract (from CDS):

We have observed atomic fine-structure lines in the far-infrared (FIR) from 12 oxygen-rich evolved stars. The sample is composed of mostly proto-planetary nebulae (PPNe) and some planetary nebulae (PNe) and asymptotic giant branch (AGB) stars. ISO LWS and SWS observations of [OI], [CII], [NII], [SiI], [SiII], [SI], [FeI], and [FeII] lines were obtained. Taking into account also the sample presented by Fong et al. (2001A&A...367..652F, Paper I) of carbon-rich evolved stars, we find that PPNe emit in these low-excitation atomic transitions only when the central star is hotter than ∼10000K. This result suggests that such lines predominantly arise from photodissociation regions (PDRs), and not from shocked regions. The line widths determined from our Fabry-Perot data also suggest that the FIR lines arise from relatively quiescent PDR gas, as opposed to shocked gas. Our results are in reasonable agreement with predictions from PDR emission models, allowing the estimation of the density of the emitting layers by comparison with the model results. On the other hand, the comparison with predictions of the emission from J-type and C-type shocked regions suggests that detected lines do not come from shocks. The [CII] line flux has been used to measure the mass of the low-excitation atomic component in PPNe, since this transition has been found to be a useful model-independent probe to estimate the total mass of these PDRs. The derivation of the mass formula and assumptions made are also discussed.

Abstract Copyright:

Journal keyword(s): atomic data - stars: AGB and post-AGB - (Stars:) circumstellar matter - stars: mass-loss - (ISM:) planetary nebulae

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1412 0
2 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 943 0
3 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1443 0
4 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 704 0
5 WOS 48 C* 15 23 05.0744336371 -51 25 58.881494593   17.85 16.66 14.51 10.18 C 116 1
6 PN Mz 3 PN 16 17 13.3911453558 -51 59 10.706640574   10.8 14.00     O9.5 329 0
7 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 493 0
8 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 747 1
9 HD 161796 pA* 17 44 55.4696 +50 02 39.484 8.00 7.68 7.21 6.77 6.51 F3Ib 310 0
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11004 0
11 * 89 Her pA* 17 55 25.1884459710 +26 02 59.970100296 5.36 5.70 5.36 5.06 4.94 F2Ibp 385 0
12 V* AC Her pA* 18 30 16.2374666779 +21 52 00.618442618 8.00 7.79 7.01     F4Ibp 313 0
13 OH 26.5 +0.6 OH* 18 37 32.51 -05 23 59.2           ~ 280 0
14 V* R Sct RV* 18 47 28.9509385830 -05 42 18.537825839 8.30 6.67 5.20 4.14 3.37 K4/5pec 294 0
15 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 783 2
16 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 216 0
17 Min 1-92 pA* 19 36 18.830 +29 32 50.86 12.13 12.35 11.75 11.54   B0.5IV[e] 234 1
18 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 170 0
19 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 825 1
20 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2301 1
21 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 224 0
22 HD 235858 pA* 22 29 10.3755939027 +54 51 06.341145584   11.40 9.52 8.47 7.34 G5Ia 234 0
23 PN Hb 12 PN 23 26 14.8207203464 +58 10 54.538636094   13.51 11.49 12.44   Oe 311 0
24 IRC +40540 C* 23 34 27.5215563443 +43 33 01.299562617     15.12     C8,3.5eJ 170 0

    Equat.    Gal    SGal    Ecl

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2019.10.19-15:40:03

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