2002A&A...382..282C

Query : 2002A&A...382..282C

2002A&A...382..282C - Astronomy and Astrophysics, volume 382282-290 (2002/1-4)

Study of electron density in planetary nebulae. A comparison of different density indicators.

COPETTI M.V.F. and WRITZL B.C.

Abstract (from CDS):

We present a comparison of electron density estimates for planetary nebulae based on different emission-line ratios. We have considered the density indicators [OII]λ3729/λ3726, [SII]λ6716/λ6731, [ClIII]λ5517/λ5537, [ArIV]λ4711/λ4740, CIII]λ1906/λ1909 and [NI]λ5202/λ5199. The observational data were extracted from the literature. We have found systematic deviations from the density homogeneous models, in the sense that: Ne(NI)≲Ne(OII)<Ne(SII, CIII, ClIII or ArIV) and Ne(SII)≃Ne(CIII)≃Ne(ClIII)≃Ne(ArIV). We argue that the lower [OII] density estimates are likely due to errors in the atomic parameters used.

Abstract Copyright: ∼

Journal keyword(s): ISM: planetary nebulae

Simbad objects: 47

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Number of rows : 47
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 NGC 40 PN 00 13 01.0170097248 +72 31 19.033338720   11.63 11.46     [WC8] 632 2
2 PN Hu 1-1 PN 00 28 15.435 +55 57 54.48           ~ 169 1
3 M 76 PN 01 42 19.6557728208 +51 34 31.534970052     17.48   17.69 DOZ 385 2
4 IC 1747 PN 01 57 35.6899203048 +63 19 18.447328776   15.8 15.4     [WC4] 269 2
5 IC 351 PN 03 47 32.9806443144 +35 02 48.639127308   13.11 12.27 14.35   Of(H) 264 0
6 IC 2003 PN 03 56 21.9884187048 +33 52 30.759977028   13.11 11.87 13.44   [WC3?] 261 0
7 IC 418 PN 05 27 28.2059533560 -12 41 50.282287764   9.405 9.010 10.118   O7fp 1059 2
8 NGC 2022 PN 05 42 06.1904253312 +09 05 10.585995576   14.9 14.2     [WC] 371 1
9 IC 2149 PN 05 56 23.9011721904 +46 06 17.204826816   11.21 11.35     O7.5 439 0
10 IC 2165 PN 06 21 42.7847803566 -12 59 14.040997076   12.146 10.782 12.305   ~ 385 0
11 PN VV 28 PN 06 25 57.2710426104 +17 47 27.136548168     12.5     [WC] 298 0
12 PN M 1-17 PN 07 40 22.1724359520 -11 32 29.783641164           ~ 105 0
13 NGC 2440 PN 07 41 55.34603 -18 12 30.4117   11.469 10.104     ~ 665 2
14 NGC 2867 PN 09 21 25.3832468160 -58 18 40.626683604   12.0 10.30     [WO2] 313 0
15 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 838 1
16 IC 3568 PN 12 33 06.8549162136 +82 33 50.202643608   11.809 10.730 12.651   ~ 407 0
17 PN Me 2-1 PN 15 22 19.2811793544 -23 37 31.412401104   12.2 12.20     ~ 224 0
18 IC 4593 PN 16 11 44.5479462840 +12 04 17.031388584   10.91 10.84     O7fp 462 0
19 NGC 6153 PN 16 31 30.5708444544 -40 15 12.646208700   10.7 15.55     ~ 320 0
20 NGC 6210 PN 16 44 29.5191019368 +23 47 59.421958296   12.3 11.7     Of/[WR] 597 0
21 NGC 6302 PN 17 13 44.5 -37 06 11           O-rich 821 2
22 NGC 6309 PN 17 14 04.3074600360 -12 54 37.893271860   11.6       O(He) 320 1
23 NGC 6445 PN 17 49 15.0282384611 -20 00 34.159640072   18.9       ~ 302 0
24 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1197 2
25 NGC 6572 PN 18 12 06.3181909152 +06 51 13.027935240   9.3 10.8     [WC] 761 0
26 NGC 6567 PN 18 13 45.1636643352 -19 04 34.071637152     10.9     [WC5/6] 277 0
27 NGC 6578 PN 18 16 16.5071627654 -20 27 02.743192002           [WC4/6] 211 0
28 PN Cn 3-1 PN 18 17 34.1015035728 +10 09 03.304908396   12.93 12.49 12.35   07Ib(f) 224 0
29 NGC 6644 PN 18 32 34.70280 -25 07 44.1588           ~ 198 0
30 M 57 PN 18 53 35.0967659112 +33 01 44.883287544   15.405 15.769 15.901 16.062 DA(O?) 868 2
31 NGC 6741 PN 19 02 37.10 -00 26 56.7     9.6     ~ 353 0
32 IC 4846 PN 19 16 28.2266496960 -09 02 36.677150592           ~ 221 0
33 IC 1297 PN 19 17 23.4475188000 -39 36 46.253665872     10.89     [WC3/4] 170 0
34 NGC 6778 PN 19 18 24.9542333399 -01 35 47.155403881   13.747 12.721     ~ 272 0
35 NGC 6803 PN 19 31 16.4826019750 +10 03 21.620200381   13.034 11.616 13.242   ~ 254 0
36 PN M 1-74 PN 19 42 18.78 +15 09 08.3   12.8       ~ 127 0
37 NGC 6818 PN 19 43 57.770472 -14 09 13.36932     9.3     ~ 357 1
38 M 27 PN 19 59 36.3631850088 +22 43 16.312059552   13.749 14.089 14.247 14.405 DAO.6 605 0
39 NGC 6884 PN 20 10 23.6424784416 +46 27 39.631794408   11.9 10.9     ~ 322 1
40 NGC 6886 PN 20 12 42.83016 +19 59 22.6320   13.053 11.719     ~ 325 1
41 IC 4997 PN 20 20 08.7557973960 +16 43 53.698933380   11.94 11.15     [WC7/8] 555 0
42 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 1020 1
43 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
44 IC 5117 PN 21 32 30.96912 +44 35 47.5404           ~ 310 1
45 PN Hu 1-2 PN 21 33 08.3106242400 +39 38 09.554428752     12.0     ~ 295 1
46 IC 5217 PN 22 23 55.7180137224 +50 58 00.464340252     15.5     [WC7] 314 0
47 PN Hb 12 PN 23 26 14.8236376464 +58 10 54.543292356   13.51 11.49 12.44   Oe 338 0

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