1998A&A...329..691K


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.11CEST09:08:53

1998A&A...329..691K - Astronomy and Astrophysics, volume 329, 691-703 (1998/1-2)

Inhomogeneous planetary nebulae: carbon and oxygen abundances.

KHOLTYGIN A.F.

Abstract (from CDS):

We reconsider the problem of the difference between the abundances of carbon and oxygen in galactic planetary nebulae (PN) derived from the intensities of the recombination and collisionally excited lines. This discrepancy can be explained by an inhomogeneity of the PNe and an overestimation of the weak line intensities. The formulae for calculation of the nebular line intensities in presence of both temperature and density fluctuations are given. The intensities of the forbidden [OIII] lines, the CII, CIII and CIV recombination lines and the CIII]λ1909 UV intercombination doublet for different values of the mean electron temperature T0 in PNe and the rms temperature variation t2, are calculated.
Result. of these calculations are used to find the values of T0 and t2 which allow to provide the best fit of the observed and calculated line intensities (taking into account the observational errors). In most cases, the obtained values of T0 appear to be significantly smaller than ordinarily used for the abundance determinations T_ e_([OIII]), while t2<0.16. The carbon and oxygen abundances for more than 70 PNe are calculated. For these PNe average chemical abundances are evaluated separately for nebulae of type I, II and III. For the first, we found C/H=6.67x10–4cm–3 and O/H=5.74x10–44cm–3. For the second they are C/H=8.94x10–4cm–3 and O/H=6.36x10–4cm–3. For the third we obtained C/H=3.94x10–4cm–3 and O/H=4.79x10–4cm–3. Results of the fitting of the line intensities for the NIII λ4640 and NIV] λ1486 lines are also given.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - ISM: abundances

Simbad objects: 69

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Number of rows : 69

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 NGC 40 PN 00 13 01.0170260109 +72 31 19.032886305   11.63 11.46     [WC8] 594 2
2 M 76 PN 01 42 19.6604707683 +51 34 31.553132974     17.48   17.69 DOZ 360 2
3 IC 1747 PN 01 57 35.6899343319 +63 19 18.443606097   15.8 15.4     [WC4] 254 2
4 IC 351 PN 03 47 32.9811922252 +35 02 48.633107981   13.11 12.27 14.35   Of(H) 251 0
5 IC 2003 PN 03 56 21.9883931981 +33 52 30.752777910   13.11 11.87 13.44   [WC3?] 244 0
6 NGC 1535 PN 04 14 15.7689951134 -12 44 21.934169738   12.01 12.82     sdO3: 504 0
7 NGC 2022 PN 05 42 06.1905641397 +09 05 10.584345578   14.9 14.2     [WC] 349 0
8 IC 2149 PN 05 56 23.9008985692 +46 06 17.206983220   11.21 11.35     O7.5 420 0
9 IC 2165 PN 06 21 42.775 -12 59 13.96     10.0     ~ 368 1
10 PN M 3-1 PN 07 02 49.9034289668 -31 35 29.173259232   12.9 12.70     ~ 119 0
11 NGC 2346 PN 07 09 22.5216571385 -00 48 23.611157830   11.76 11.58     A5V 557 0
12 NGC 2371 PN 07 25 34.6884571396 +29 29 26.430027683   14.48 13.5     Oe 353 0
13 NGC 2392 PN 07 29 10.7669120392 +20 54 42.478515772     9.68     O6f 702 1
14 NGC 2440 PN 07 41 54.91 -18 12 29.7   18.9       ~ 631 2
15 WRAY 16-16 PN 08 11 31.800 -48 43 17.70   12.4 12.40     ~ 72 0
16 NGC 2818 PN 09 16 01.4879747574 -36 37 37.531389997   12.5 12.50     ~ 267 0
17 NGC 2867 PN 09 21 25.3833564294 -58 18 40.616684216   12.0 10.30     [WO2] 293 0
18 IC 2501 PN 09 38 47.1807127191 -60 05 30.742117523   11.7 10     O3-6 174 0
19 NGC 3132 PN 10 07 01.7655812249 -40 26 11.138949314   10.14 10.01     A2V 374 1
20 IC 2553 PN 10 09 20.8501237534 -62 36 48.504671696     10.90     wels? 116 0
21 NGC 3211 PN 10 17 50.544 -62 40 12.10   19.4 11.50     ~ 177 0
22 NGC 3242 PN 10 24 46.1335198512 -18 38 32.294434711   11.83 12.15     ~ 804 1
23 NGC 3918 PN 11 50 17.7723407998 -57 10 57.059135256   10.0 8.5     ~ 366 0
24 NGC 4361 PN 12 24 30.7509091298 -18 47 05.564628299   12.8 13.2     [WC] 385 1
25 IC 3568 PN 12 33 06.8549263326 +82 33 50.203860251   11.809 10.730 12.651   ~ 391 0
26 NGC 5315 PN 13 53 56.9609674528 -66 30 50.915454108   14.58 14.40     [WO4] 294 0
27 NGC 5873 PN 15 12 50.8601856470 -38 07 31.593041989   11.6 9.7     [WC] 136 0
28 NGC 5882 PN 15 16 49.9567882973 -45 38 58.610861335   11.9 10.9     ~ 268 0
29 PN Me 2-1 PN 15 22 19.2744138687 -23 37 31.499029460   12.2 12.20     ~ 212 0
30 NGC 6153 PN 16 31 30.5709136856 -40 15 12.646146874   10.7 15.55     ~ 290 0
31 NGC 6210 PN 16 44 29.5195973291 +23 47 59.491267229   12.3 11.7     Of/[WR] 576 0
32 IC 4634 PN 17 01 33.5805836298 -21 49 33.002375687   12.3 11.3     O3If 266 0
33 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 762 1
34 NGC 6309 PN 17 14 04.3073336607 -12 54 37.891046946   11.6       O(He) 299 1
35 PN Vy 1-2 PN 17 54 22.98 +27 59 58.1           ~ 105 0
36 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1132 1
37 NGC 6572 PN 18 12 06.3140077888 +06 51 13.030152295   9.3 10.8     [WC] 740 0
38 PN SwSt 1 PN 18 16 12.2731488024 -30 52 07.796394989   12.1 11.10     [WC9/10] 281 0
39 PN Cn 3-1 PN 18 17 34.1015205519 +10 09 03.306489008   12.93 12.49 12.35   07Ib(f) 209 0
40 PN M 3-27 PN 18 27 48.2640348979 +14 29 06.065873844           ~ 72 0
41 NGC 6644 PN 18 32 34.70 -25 07 44.2     9.6     ~ 186 0
42 PN Hu 2-1 PN 18 49 47.56755 +20 50 39.4576   12.369 11.126 12.30   ~ 266 0
43 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 797 2
44 NGC 6741 PN 19 02 37.10 -00 26 56.7     9.6     ~ 342 0
45 IC 4846 PN 19 16 28.2205101750 -09 02 36.760345214           ~ 206 0
46 IC 1297 PN 19 17 23.4475611063 -39 36 46.255054503     10.89     [WC3/4] 154 0
47 NGC 6778 PN 19 18 25.0 -01 35 47     14.8     ~ 244 0
48 NGC 6790 PN 19 22 56.966 +01 30 46.46   12.52 10.45     wels 314 0
49 NGC 6803 PN 19 31 16.47 +10 03 21.7     15.2     ~ 244 0
50 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 925 0
51 PN M 1-74 PN 19 42 18.78 +15 09 08.3   12.8       ~ 120 0
52 NGC 6818 PN 19 43 58.022 -14 09 13.44     9.3     ~ 339 1
53 NGC 6826 PN 19 44 48.1500835472 +50 31 30.250916761   10.21 9.6     O6fp 703 0
54 NGC 6833 PN 19 49 46.5751757576 +48 57 40.076934646           ~ 166 0
55 M 27 PN 19 59 36.3632092274 +22 43 16.312364964   13.749 14.089 14.247 14.405 DAO.6 571 0
56 NGC 6884 PN 20 10 23.6401227444 +46 27 39.547818788   11.9 10.9     ~ 308 1
57 NGC 6886 PN 20 12 42.83 +19 59 22.6           ~ 315 0
58 NGC 6891 PN 20 15 08.8436589777 +12 42 15.585470301   12.11 12.51     O3Ib(f*) 386 0
59 IC 4997 PN 20 20 08.7615653034 +16 43 53.993812400   11.94 11.15     [WC7/8] 530 0
60 NGC 6905 PN 20 22 22.9919829747 +20 06 16.284924395   16.3 14.5     [WC3] 332 0
61 NGC 7009 PN 21 04 10.8153350719 -11 21 48.581808296   12.48 12.07     ~ 972 1
62 NGC 7026 PN 21 06 18.5721833093 +47 51 06.780221314   15.33 15.1     [WC3] 406 1
63 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2357 1
64 IC 5117 PN 21 32 30.97 +44 35 47.5     16.7     ~ 291 0
65 PN Hu 1-2 PN 21 33 08.3071114501 +39 38 09.524664348     12.0     ~ 277 1
66 IC 5217 PN 22 23 55.7197244731 +50 58 00.461084740     15.5     [WC7] 301 0
67 PN M 1-80 PN 22 56 19.907 +57 09 21.07           ~ 95 1
68 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 913 0
69 PN Hb 12 PN 23 26 14.8207203464 +58 10 54.538636094   13.51 11.49 12.44   Oe 317 0

    Equat.    Gal    SGal    Ecl

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2021.05.11-09:08:53

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