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

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 Query : 2001A&A...367..983P

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.

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

Full paper

 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 - 2023
#notes
1 NGC 40 PN 00 13 01.0170097248 +72 31 19.033338720   11.63 11.46     [WC8] 608 2
2 LHA 115-N 6 PN 00 41 27.7392128784 -73 47 06.468599004 16.82 16.84 15.82   16.92 ~ 57 0
3 LIN 302 PN 00 56 19.4731005696 -72 06 58.158479268   16.0 17.609   17.792 ~ 26 0
4 IC 1747 PN 01 57 35.6899203048 +63 19 18.447328776   15.8 15.4     [WC4] 259 2
5 IC 2003 PN 03 56 21.9884187048 +33 52 30.759977028   13.11 11.87 13.44   [WC3?] 250 0
6 NGC 1501 PN 04 06 59.3920909320 +60 55 14.278542024   15.17 13.0     [WO4] 291 1
7 PN M 4-18 PN 04 25 50.8356162744 +60 07 12.780446700   14.22 13.96     [WC11] 177 0
8 2MASS J05112369-7001573 pA? 05 11 23.692 -70 01 57.36 15.971 16.222 15.008 15.53 16.678 ~ 40 0
9 IRAS 05248-7007 pA? 05 24 20.7467383224 -70 05 01.601773404 15.939 16.236 15.368 15.120 16.556 ~ 57 0
10 IRAS F05258-7343 pA? 05 24 35.9730395808 -73 40 40.240094808   16.48     16.64 WC 59 0
11 IRAS 05551-6528 El* 05 55 13.6808450040 -65 28 23.221220232 18.011 18.795 18.100   17.921 ~ 17 0
12 NGC 2371 PN 07 25 34.6883929008 +29 29 26.430252072   14.48 13.5     Oe 364 0
13 NGC 2452 PN 07 47 26.2649505144 -27 20 06.819982188   17.9 12.20     [WO1] 253 0
14 NGC 2867 PN 09 21 25.3832468160 -58 18 40.626683604   12.0 10.30     [WO2] 297 0
15 PN PB 6 PN 10 13 15.9622567176 -50 19 59.563979688   17.4 17.6     [WO1] 133 0
16 WRAY 16-79 PN 10 48 43.2301961352 -56 03 09.640445832   17.6 17.4     [WO3] 73 0
17 WRAY 16-139 PN 13 52 30.6807509784 -66 23 26.577448872 12.57 13.26 13.18 13.52   [WC9] 157 0
18 WRAY 15-1269 PN 14 59 53.4819371136 -54 18 07.521138792 12.12 12.17 11.64 11.63   [WC11] 241 0
19 PN K 2-16 PN 16 44 49.0522431864 -28 04 04.706514300   13.18 12.75     [WC11] 91 0
20 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 352 0
21 NGC 6369 PN 17 29 20.4566510904 -23 45 34.771819248   16.6 12.00     [WC4] 313 0
22 PN M 1-25 PN 17 38 30.3160501176 -22 08 38.934269052   17.9       [WC6] 143 0
23 PN Hb 4 PN 17 41 52.8002065320 -24 42 08.330663196   18.4 17     [WC4] 215 1
24 PN M 3-15 PN 17 45 31.7096699160 -20 58 01.493896440           [WC4/6] 124 1
25 IRAS 17514-1555 PN 17 54 21.13104 -15 55 52.0032           [WC11] 98 0
26 PN Cn 2-1 PN 17 54 33.010 -34 22 21.15     12.70 14.47 13.70 ~ 133 0
27 PN M 1-32 PN 17 56 20.11 -16 29 04.6   18.3 17.0     [WC4/5] 100 1
28 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1153 1
29 NGC 6567 PN 18 13 45.1636643352 -19 04 34.071637152     10.9     [WC5/6] 268 1
30 PN SwSt 1 PN 18 16 12.2834104368 -30 52 07.906578996   12.1 11.10     [WC9/10] 289 0
31 NGC 6578 PN 18 16 16.517 -20 27 02.67           [WC4/6] 202 0
32 PN M 2-43 PN 18 26 40.0500205632 -02 42 57.364170912     15.7     [WC7/8] 117 0
33 PN Cn 1-5 PN 18 29 11.6500996872 -31 29 59.135208396   15.5 15.2 13.34   [WC5/6] 147 0
34 PN M 3-30 PN 18 41 14.938 -15 33 43.58     17.9     [WC2/3] 87 0
35 NGC 6751 PN 19 05 55.5383775432 -05 59 32.288861544   15.78 15.48     [WC4] 325 0
36 PN M 4-13 PN 19 13 38.4236144616 +14 59 19.157634744           [WC4/5] 69 0
37 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 941 0
38 Hen 2-459 PN 20 13 57.8909464128 +29 33 55.874044764   14.10 12.67     [WC9] 100 0
39 NGC 6905 PN 20 22 22.9919225472 +20 06 16.285052088   16.3 14.5     [WC3] 340 0
40 NGC 7026 PN 21 06 18.5723414928 +47 51 06.774735780   15.33 15.1     [WC3] 414 1
41 PN K 3-61 PN 21 30 00.7565699064 +54 27 27.195110712   15.9 14.8     [WC4/6] 73 0
42 IC 5217 PN 22 23 55.7180137224 +50 58 00.464340252     15.5     [WC7] 305 0

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2023.03.30-22:49:03