2008A&A...489.1141R


Query : 2008A&A...489.1141R

2008A&A...489.1141R - Astronomy and Astrophysics, volume 489, 1141-1150 (2008/10-3)

Line ratios from shocked cloudlets in planetary nebulae.

RAGA A.C., RIERA A., MELLEMA G., ESQUIVEL A. and VELAZQUEZ P.F.

Abstract (from CDS):

Some PNe and PPNe show compact knots, travelling at high velocities away from the central sources. We compute a number of models from which we obtain predictions of the emission-line spectrum, which can be compared with the spectra of the observed knots. We completed a series of 11 axisymmetric simulations of an initially spherical cloudlet, travelling away from a photoionizing source, into a uniform medium. The simulations included a multi-frequency transfer of the ionizing radiation, and a 33 species non-equilibrium ionization network. From our simulations, we computed emission maps and spatially-integrated emission-line spectra. The predictions show a transition from spectra similar to those of shock wave models (for simulations with lower photoionization rates) to spectra similar to those of photoionized regions (for simulations with higher photoionization rates). The spectra from our photoionized cloudlet models have a range of line ratios that agree approximately with the observed spectra when shown in two-line ratio diagnostic diagrams. The predicted and observed spatial distributions of the emission (with high ionization lines extending more towards the source than lower ionization lines) agree in a qualitative way.

Abstract Copyright:

Journal keyword(s): ISM: kinematics and dynamics - ISM: jets and outflows - planetary nebulae: general

CDS comments: In Fig. 10 OH 238.1+4.2 is a misprint for OH 231.8+4.2.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 981 0
2 OH 231.8 +4.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 519 1
3 IC 4634 PN 17 01 33.5816774904 -21 49 33.015515916   12.3 11.3     O3If 270 0
4 Hen 3-1475 PN 17 45 14.1819342984 -17 56 46.778166204   13.84 12.87     B7e 193 0
5 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1143 1
6 Min 1-92 pA* 19 36 18.9295687968 +29 32 49.785288144 12.13 12.35 11.75 11.54   B0.5IV[e] 244 1
7 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 979 1
8 NGC 7293 PN 22 29 38.5454047152 -20 50 13.747242408 11.894 13.158 13.524 13.689 13.898 DAO.5 925 0
9 PN M 2-56 pA* 23 56 36.4049726352 +70 48 18.246610008   19.81 17 17.27 17.64 Be 91 0

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2022.05.27-09:10:23

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