2001A&A...367..983P


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.19CEST23:50:11

2001A&A...367..983P - Astronomy and Astrophysics, volume 367, 983-994 (2001/3-1)

Galactic planetary nebulae with Wolf-Rayet nuclei. II. A consistent observational data set.

PENA M., STASINSKA G. and MEDINA S.

Abstract (from CDS):

We present high resolution spectrophotometric data for a sample of 34 planetary nebulae with [WC] spectral type central stars (WRPNe) in our Galaxy. The observed objects cover a wide range in stellar characteristics: early and late [WC] type stars, as well as weak-emission line stars (WELS). Physical conditions in the nebulae (electron density and temperatures) have been obtained from various diagnostic line ratios, and chemical abundances have been derived with the usual empirical scheme. Expansion velocities were estimated in a consistent manner from the line profiles for most objects of the sample. A statistical study was developed for the derived data in order to find fundamental relationships casting some light on the evolutionary status of WRPNe. We found evidence for a strong electron temperature gradient in WRPNe which is related to nebular excitation. Such a gradient is not predicted in simple photoionization models. Abundance ratios indicate that there seems to be no preferential stellar mass for the Wolf-Rayet phenomenon to occur in the nucleus of a planetary nebula. Two objects, M1-25 and M1-32, were found to have a very small Ne/O ratio, a property difficult to understand. We reexamined the relation between the nebular properties of the WRPNe and the spectral types of the central stars. Our data confirm the trend found by other authors of the electron density decreasing with decreasing spectral type, which was interpreted as evidence that [WC] stars evolve from late to early [WC] types. On the other hand, our data on the expansion velocities do not show the increase of expansion velocity with decreasing spectral type, that one might expect in such a scenario. Two objects with very late [WC] type central stars, K2-16 and PM1-188, do not follow the general density sequence, being of very low density for their spectral types. We suggest that the stars either underwent a late helium flash (the ``born again'' scenario) or that they have had a particularly slow evolution from the AGB. The 6 WELS of our sample follow the same density vs. [WC]-type relation as the bona fide WRPNe, but they tend to have smaller expansion velocities. Considerations about the evolutionary status of WELS must await the constitution of a larger observational sample. The analysis of the differences between the WRPNe in the Magellanic Clouds (distribution of [WC] spectral types, N/O ratios) and in the Galaxy indicates that metallicity affects the [WR] phenomenon in central stars of planetary nebulae.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - stars: Wolf-Rayet - planetary nebulae: individual: K2-16, PM1-188, M1-32, M3-15

Simbad objects: 42

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Number of rows : 42

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 40 PN 00 13 01.0170260109 +72 31 19.032886305   11.63 11.46     [WC8] 580 2
2 LHA 115-N 6 PN 00 41 27.77 -73 47 06.4 16.82 16.84 15.82   16.92 ~ 54 0
3 LIN 302 PN 00 56 19.4713604941 -72 06 58.161111444   16.0 17.609   17.792 ~ 24 0
4 IC 1747 PN 01 57 35.6899343319 +63 19 18.443606097   15.8 15.4     [WC4] 249 2
5 IC 2003 PN 03 56 21.9883931981 +33 52 30.752777910   13.11 11.87 13.44   [WC3?] 243 0
6 NGC 1501 PN 04 06 59.3919688584 +60 55 14.277444117   15.17 13.0     [WO4] 276 1
7 PN M 4-18 PN 04 25 50.8357219366 +60 07 12.778708522   14.22 13.96     [WC11] 168 0
8 2MASS J05112369-7001573 pA? 05 11 23.692 -70 01 57.36 15.971 16.222 15.008 15.53 16.678 ~ 38 0
9 IRAS 05248-7007 pA? 05 24 20.7466752171 -70 05 01.596669464 15.939 16.236 15.368 15.120 16.556 ~ 51 0
10 IRAS F05258-7343 pA? 05 24 35.9812176149 -73 40 40.213765086   16.48     16.64 WC 58 0
11 IRAS 05551-6528 El* 05 55 13.6811311793 -65 28 23.223704536 18.011 18.795 18.100   17.921 ~ 16 0
12 NGC 2371 PN 07 25 34.6884571396 +29 29 26.430027683   14.48 13.5     Oe 347 0
13 NGC 2452 PN 07 47 26.2648363344 -27 20 06.826143423   17.9 12.20     [WO1] 246 0
14 NGC 2867 PN 09 21 25.3833564294 -58 18 40.616684216   12.0 10.30     [WO2] 287 0
15 PN PB 6 PN 10 13 15.989 -50 19 59.13   17.4 17.6     [WO1] 126 0
16 WRAY 16-79 PN 10 48 43.2301944525 -56 03 09.641474401   17.6 17.4     [WO3] 67 0
17 WRAY 16-139 PN 13 52 30.6807824735 -66 23 26.576683632 12.57 13.26 13.18 13.52   [WC9] 153 0
18 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 224 0
19 PN K 2-16 PN 16 44 49.0523721067 -28 04 04.705394782   13.18 12.75     [WC11] 83 0
20 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 300 0
21 NGC 6369 PN 17 29 20.4566547788 -23 45 34.771598164   16.6 12.00     [WC4] 295 0
22 PN M 1-25 PN 17 38 30.3090210711 -22 08 39.031594171   17.9       [WC6] 136 0
23 PN Hb 4 PN 17 41 52.7988053576 -24 42 08.343474051   18.4 17     [WC4] 201 1
24 PN M 3-15 PN 17 45 31.7106453927 -20 58 01.474691822           [WC4/6] 115 1
25 PN HuBi 1 PN 17 54 21.13 -15 55 52.0   15.42 14.90     [WC11] 80 0
26 PN Cn 2-1 PN 17 54 33.010 -34 22 21.15     12.70 14.47 13.70 ~ 129 0
27 PN M 1-32 PN 17 56 20.11 -16 29 04.6   18.3 17.0     [WC4/5] 89 1
28 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1102 1
29 NGC 6567 PN 18 13 45.1634807418 -19 04 34.069059115     10.9     [WC5/6] 256 1
30 PN SwSt 1 PN 18 16 12.2731488024 -30 52 07.796394989   12.1 11.10     [WC9/10] 275 0
31 NGC 6578 PN 18 16 16.517 -20 27 02.67           [WC4/6] 192 0
32 PN M 2-43 PN 18 26 40.0469091191 -02 42 57.485078141     15.7     [WC7/8] 112 0
33 PN Cn 1-5 PN 18 29 11.6504002939 -31 29 59.125146747   15.5 15.2 13.34   [WC5/6] 138 0
34 PN M 3-30 PN 18 41 14.938 -15 33 43.58     17.9     [WC2/3] 82 0
35 NGC 6751 PN 19 05 55.5385116189 -05 59 32.291075445   15.78 15.48     [WC4] 313 0
36 PN M 4-13 PN 19 13 38.42 +14 59 19.1           [WC4/5] 63 0
37 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 912 0
38 Hen 2-459 PN 20 13 57.8911274947 +29 33 55.867549868   14.10 12.67     [WC9] 93 0
39 NGC 6905 PN 20 22 22.9919829747 +20 06 16.284924395   16.3 14.5     [WC3] 326 0
40 NGC 7026 PN 21 06 18.5721833093 +47 51 06.780221314   15.33 15.1     [WC3] 402 1
41 PN K 3-61 PN 21 30 00.7568306607 +54 27 27.196178986   15.9 14.8     [WC4/6] 69 0
42 IC 5217 PN 22 23 55.7197244732 +50 58 00.461084740     15.5     [WC7] 294 0

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2019.09.19-23:50:11

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