1998A&AS..130..465P


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST20:31:11

1998A&AS..130..465P - Astron. Astrophys., Suppl. Ser., 130, 465-476 (1998/June-2)

Spectral trends in planetary nebulae: The roles of radiative and shock excitation.

PHILLIPS J.P. and GUZMAN V.

Abstract (from CDS):

We have investigated de-reddened spectral line ratios for some 538 planetary nebulae. As a result, it has proved possible to define comparative variations between differing transitions, evaluate the viability of radiative modeling for the generality of nebulae, and assess the importance of shocks in modifying low- excitation line strengths. Whilst most transitions are well represented in terms of radiative excitation, the [OI] λ6300Å line appears to be appreciably too strong in most of the present sample; a deviation which may arise through shock interaction between the primary outflow shell and enveloping superwind material. Comparison between shock modeling and line excesses also suggests that an appreciable proportion of [SII] λ6716/31Å emission may arise through shock excitation; a conclusion which, if confirmed, may have serious consequences for nebular density estimations. Some 14 nebulae are identified as likely shock candidates, whilst it is proposed that the majority of bipolar nebulae may also show spectral deviations associated with shock excitation. Line excesses for these latter sources are most consistent with shock velocities Vs∼80-100km/s; values which are also comparable to observed wind velocities. Finally, sources containing FLIERs (Balick et al., 1993ApJ...411..778B) are shown to be confined to highly specific spectral regimes; a result which permits us to identify three further possible FLIER sources, and propose characteristic line ratio diagnostics for the further discovery of such features.

Abstract Copyright:

Journal keyword(s): survey - ISM: planetary nebulae - ISM: jets and outflows - shocks waves

Errata: Erratum A&AS Vol 133, p. 445

Simbad objects: 30

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Number of rows : 30

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 PN M 1-1 PN 01 37 19.425 +50 28 11.56   13.07 13.91     ~ 136 0
2 M 76 PN 01 42 19.6604707683 +51 34 31.553132974     17.48   17.69 DOZ 360 2
3 PN M 1-4 PN 03 41 43.4168166754 +52 17 00.260598954   15.86 14.27 15.26   ~ 111 1
4 IC 351 PN 03 47 32.9811922252 +35 02 48.633107981   13.11 12.27 14.35   Of(H) 251 0
5 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 966 0
6 Jonckheere 320 PN 05 05 34.2774523754 +10 42 22.923399381           O3V(f) 275 2
7 NGC 2022 PN 05 42 06.1905641397 +09 05 10.584345578   14.9 14.2     [WC] 349 0
8 PN A66 21 PN 07 29 02.7094421237 +13 14 48.589321539   15.67 15.99     DOZ 182 0
9 NGC 2440 PN 07 41 54.91 -18 12 29.7   18.9       ~ 631 2
10 NGC 2899 PN 09 27 03.02 -56 06 21.1     12.40     G0 146 0
11 WRAY 16-135 PN 13 45 22.3674292595 -71 28 56.136996109   12.9 12.80     Of-WR(H) 71 0
12 NGC 5307 PN 13 51 03.322 -51 12 20.77   11.5 10     O3.5V 170 0
13 PN Sn 1 PN 16 21 04.3991393878 -00 16 10.679547644           ~ 90 0
14 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1132 1
15 PN M 2-23 PN 18 01 42.64 -28 25 44.2     13.00     ~ 114 0
16 NGC 6537 PN 18 05 13.104 -19 50 34.88     13.58     ~ 413 1
17 PN M 2-30 PN 18 12 34.40 -27 58 10.5   13.5 14.00     ~ 101 0
18 NGC 6567 PN 18 13 45.1634807418 -19 04 34.069059115     10.9     [WC5/6] 261 1
19 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 797 2
20 NGC 6790 PN 19 22 56.966 +01 30 46.46   12.52 10.45     wels 314 0
21 NGC 6833 PN 19 49 46.5751757576 +48 57 40.076934646           ~ 166 0
22 M 27 PN 19 59 36.3632092274 +22 43 16.312364964   13.749 14.089 14.247 14.405 DAO.6 571 0
23 NGC 6879 PN 20 10 26.70 +16 55 21.4     14.8     O3f(He) 145 0
24 NGC 6891 PN 20 15 08.8436589777 +12 42 15.585470301   12.11 12.51     O3Ib(f*) 386 0
25 NGC 7019 EmG 21 06 25.715 -24 24 45.65   15.09   13.98   ~ 17 0
26 NGC 7293 PN 22 29 38.5453078023 -20 50 13.746093105 11.894 13.158 13.524 13.689 13.898 DAO.5 910 0
27 PN Me 2-2 PN 22 31 43.683 +47 48 03.91   9.3       ~ 148 0
28 PN KjPn 8 PN 23 24 10.472 +60 57 30.75           ~ 112 0
29 PN Hb 12 PN 23 26 14.8207203464 +58 10 54.538636094   13.51 11.49 12.44   Oe 317 0
30 PN M 2-56 pA* 23 56 36.4101419399 +70 48 18.253127954   19.81 17 17.27 17.64 Be 88 0

    Equat.    Gal    SGal    Ecl

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