2005MNRAS.358..457Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.05CEST23:30:46

2005MNRAS.358..457Z - Mon. Not. R. Astron. Soc., 358, 457-467 (2005/April-1)

Helium recombination spectra as temperature diagnostics for planetary nebulae.

ZHANG Y., LIU X.-W., LIU Y. and RUBIN R.H.

Abstract (from CDS):

Electron temperatures derived from the HeI recombination line ratios, designated Te(HeI), are presented for 48 planetary nebulae (PNe). We study the effect that temperature fluctuations inside nebulae have on the Te(HeI) value. We show that a comparison between Te(HeI) and the electron temperature derived from the Balmer jump of the HI recombination spectrum, designated Te(HI), provides an opportunity to discriminate between the paradigms of a chemically homogeneous plasma with temperature and density variations, and a two-abundance nebular model with hydrogen-deficient material embedded in diffuse gas of a `normal' chemical composition (i.e. ∼solar), as the possible causes of the dichotomy between the abundances that are deduced from collisionally excited lines and those deduced from recombination lines. We find that Te(HeI) values are significantly lower than Te(HI) values, with an average difference of <Te(HI) -Te(HeI)≥ 4000 K. The result is consistent with the expectation of the two-abundance nebular model but is opposite to the prediction of the scenarios of temperature fluctuations and/or density inhomogeneities. From the observed difference between Te(HeI) and Te(HI), we estimate that the filling factor of hydrogen-deficient components has a typical value of 10–4. In spite of its small mass, the existence of hydrogen-deficient inclusions may potentially have a profound effect in enhancing the intensities of HeI recombination lines and thereby lead to apparently overestimated helium abundances for PNe.

Abstract Copyright: 2005 RAS

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

CDS comments: In Ref. : Peimbert et al. 2004 : 2004ApJS.150.431P instead of 2004ApJ.150.431P.

Simbad objects: 50

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Number of rows : 50

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 IC 2003 PN 03 56 21.9883931981 +33 52 30.752777910   13.11 11.87 13.44   [WC3?] 244 0
3 NGC 3132 PN 10 07 01.7655812249 -40 26 11.138949314   10.14 10.01     A2V 374 1
4 NGC 3242 PN 10 24 46.1335198512 -18 38 32.294434711   11.83 12.15     ~ 804 1
5 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 229 2
6 NGC 3918 PN 11 50 17.7723407998 -57 10 57.059135256   10.0 8.5     ~ 366 0
7 IC 3568 PN 12 33 06.8549263326 +82 33 50.203860251   11.809 10.730 12.651   ~ 391 0
8 IC 4191 PN 13 08 47.34 -67 38 37.6   10.32 11.61     ~ 135 0
9 NGC 5307 PN 13 51 03.322 -51 12 20.77   11.5 10     O3.5V 170 0
10 NGC 5315 PN 13 53 56.9609674528 -66 30 50.915454108   14.58 14.40     [WO4] 294 0
11 IC 4406 PN 14 22 26.1443764953 -44 09 02.205426646   11.5 10.90     ~ 269 0
12 WRAY 16-156 PN 14 33 17.97 -60 49 36.3   16.3 16.7   15.38 ~ 157 0
13 WRAY 16-165 PN 15 06 13.7149467774 -42 59 56.513764472   13.2 13.20     ~ 71 0
14 NGC 5873 PN 15 12 50.8601856470 -38 07 31.593041989   11.6 9.7     [WC] 136 0
15 NGC 5882 PN 15 16 49.9567882973 -45 38 58.610861335   11.9 10.9     ~ 268 0
16 NGC 6153 PN 16 31 30.5709136856 -40 15 12.646146874   10.7 15.55     ~ 290 0
17 NGC 6210 PN 16 44 29.5195973291 +23 47 59.491267229   12.3 11.7     Of/[WR] 576 0
18 IC 4634 PN 17 01 33.5805836298 -21 49 33.002375687   12.3 11.3     O3If 266 0
19 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 762 1
20 PN M 1-20 PN 17 28 57.612 -19 15 53.94           ~ 120 0
21 PN H 1-35 PN 17 49 13.9251055629 -34 22 52.842287784     12.90     wels? 108 0
22 PN Cn 2-1 PN 17 54 33.010 -34 22 21.15     12.70 14.47 13.70 ~ 131 0
23 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1132 1
24 PN M 2-24 PN 18 02 02.8949286491 -34 27 47.271639687   15.62 14.60 15.29   ~ 94 0
25 PN M 3-21 PN 18 02 32.33 -36 39 11.3     12.20     ~ 104 1
26 PN H 1-50 PN 18 03 53.5070795395 -32 41 42.015753284   10 12.80     ~ 76 0
27 PN M 1-42 PN 18 11 04.99 -28 58 59.1   13.1 14.00     ~ 196 0
28 NGC 6572 PN 18 12 06.3140077888 +06 51 13.030152295   9.3 10.8     [WC] 740 0
29 NGC 6567 PN 18 13 45.1634807418 -19 04 34.069059115     10.9     [WC5/6] 261 1
30 PN M 2-36 EB* 18 17 41.43 -29 08 19.9   12.8 13.40   17.012 ~ 127 0
31 NGC 6620 PN 18 22 54.182 -26 49 17.19   12.8 13.30 14.34 14.55 ~ 135 0
32 PN M 3-32 PN 18 44 43.03 -25 21 34.8           ~ 64 0
33 IC 4776 PN 18 45 50.705 -33 20 34.12   11.98 10.62     [WC]pec 192 1
34 PN Hu 2-1 PN 18 49 47.56755 +20 50 39.4576   12.369 11.126 12.30   ~ 266 0
35 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 797 2
36 NGC 6741 PN 19 02 37.10 -00 26 56.7     9.6     ~ 342 0
37 IC 1297 PN 19 17 23.4475611063 -39 36 46.255054503     10.89     [WC3/4] 154 0
38 NGC 6790 PN 19 22 56.966 +01 30 46.46   12.52 10.45     wels 314 0
39 NGC 6803 PN 19 31 16.47 +10 03 21.7     15.2     ~ 244 0
40 NGC 6818 PN 19 43 58.022 -14 09 13.44     9.3     ~ 339 1
41 NGC 6826 PN 19 44 48.1500835472 +50 31 30.250916761   10.21 9.6     O6fp 703 0
42 NGC 6833 PN 19 49 46.5751757576 +48 57 40.076934646           ~ 166 0
43 NGC 6884 PN 20 10 23.6401227444 +46 27 39.547818788   11.9 10.9     ~ 308 1
44 IC 4997 PN 20 20 08.7615653034 +16 43 53.993812400   11.94 11.15     [WC7/8] 530 0
45 NGC 7009 PN 21 04 10.8153350719 -11 21 48.581808296   12.48 12.07     ~ 972 1
46 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2357 1
47 PN Hu 1-2 PN 21 33 08.3071114501 +39 38 09.524664348     12.0     ~ 277 1
48 IC 5217 PN 22 23 55.7197244731 +50 58 00.461084740     15.5     [WC7] 301 0
49 PN Me 2-2 PN 22 31 43.683 +47 48 03.91   9.3       ~ 148 0
50 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 913 0

    Equat.    Gal    SGal    Ecl

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2021.05.05-23:30:46

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