1998A&A...329L...9P

Query : 1998A&A...329L...9P

1998A&A...329L...9P - Astronomy and Astrophysics, volume 329L9-12 (1998/1-1)

Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG 1159 stars.

PARTHASARATHY M., ACKER A. and STENHOLM B.

Abstract (from CDS):

The characteristics of the spectra of weak emission line stars (WELS) are found to be very similar to that of [WC]-PG1159 and PG1159 objects. On the basis of the spectra we find 31 WELS central stars of planetary nebulae to be in fact [WC]-PG1159 stars. These stars mark the transition from the [WC] central stars of planetary nebulae to the PG1159 (pre-)white dwarfs. The evolutionary sequence appears to be [WC late]-[WC early]-WELS=[WC]-PG1159-PG1159. The presence of nebulae and dust shells around these stars and also the significant percentage of [WC]-PG1159 stars among the [WC] central stars of PN indicates that late He-flash scenario may not be the principal mechanism for their post-AGB evolution towards the non-DA white dwarf stage. We found 4 hybrid central stars. They display a HeII/CIV 4650-4686Å trough very similar to that of PG1159 stars. However, their spectra show stellar Balmer lines indicating that they are relatively hydrogen-rich in contrast to the PG1159 stars.

Abstract Copyright: ∼

Journal keyword(s): stars: post-AGB - stars: carbon - stars: evolution - ISM: planetary nebulae - stars: emission-line

Simbad objects: 51

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Number of rows : 51
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 246 PN 00 47 03.3420341616 -11 52 18.971126076 10.15 11.52 11.76 12.18   PG1159 489 0
2 PN VV 28 PN 06 25 57.2710426104 +17 47 27.136548168     12.5     [WC] 298 0
3 EM* AS 200 PN 08 28 27.9571309320 -39 23 40.041064644   12 14.00     [WC] 92 0
4 PN M 3-6 PN 08 40 40.2260788368 -32 22 33.595889196     12.79     [WC] 115 0
5 PN A66 30 PN 08 46 53.4639874872 +17 52 46.369394580   14.23 14.30 13.47   [WC5] 431 0
6 WRAY 16-57 PN 09 41 37.4988509057 -49 57 58.588184306   15.233 13.950 15.477   [WC] 64 0
7 PN Lo 4 PN 10 05 45.7880109408 -44 21 33.523482384           sdO 146 1
8 PN Pe 1-1 PN 10 38 27.5856481368 -56 47 07.226821644   15.855 14.178 15.394   [WC4/5] 108 1
9 PN PB 8 PN 11 33 17.8152363912 -57 06 14.925910860   13.332 12.436 14.114   [WC5/6] 125 0
10 PG 1144+005 WD* 11 46 35.2284791112 +00 12 33.539992056   14.922 15.233     PG1159 92 0
11 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 505 0
12 WRAY 16-117 PN 12 30 30.4344727152 -64 52 05.689186752   14.55 15.00     [WC4] 130 0
13 CPD-51 6744 PN 14 18 08.8853838456 -52 10 39.516692592   12.39 11.98     [WC] 158 0
14 NGC 5873 PN 15 12 50.8605628680 -38 07 31.585496844   11.6 9.7     [WC] 146 0
15 PG 1520+525 PN 15 21 46.5635130432 +52 22 03.867341340   15.56 16.6     PG1159 118 1
16 HD 138403 PN 15 37 11.2073139768 -71 54 52.887104280   10.24 10.47 11.01   O8(f)ep 268 0
17 PN M 1-19 PN 17 03 46.8491993472 -33 29 44.433527316   15.02 13.87 14.87 14.16 [WC] 75 0
18 PN M 3-7 PN 17 24 34.4529856560 -29 24 19.796240052     14.60     [WC] 97 0
19 PN M 1-25 PN 17 38 30.3160501176 -22 08 38.934269052   17.9       [WC6] 156 0
20 PN H 1-29 WV* 17 44 13.8729577601 -34 17 32.824856894     14.90 16.04 14.90 [WC4/6] 76 0
21 PN M 1-31 PN 17 52 41.4448424016 -22 21 57.159303984           [WC] 116 0
22 PN A66 43 PN 17 53 32.2767758208 +10 37 24.210757560   14.53 14.71     O7fk 144 0
23 PN Cn 2-1 PN 17 54 33.010 -34 22 21.15     12.70 14.47 13.70 ~ 136 0
24 PN H 1-41 PN 17 57 19.1084978568 -34 09 48.784614372           [WC] 93 0
25 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1197 2
26 PN M 2-27 PN 18 03 52.5718384152 -31 17 47.161796424     14.40     [WC4]: 110 0
27 NGC 6572 PN 18 12 06.3181909152 +06 51 13.027935240   9.3 10.8     [WC] 761 0
28 PN H 1-60 PN 18 12 25.22 -27 29 12.8           [WC] 76 0
29 PN M 2-31 PN 18 13 16.0521431976 -25 30 05.320920636   13.3 13.60     [WC4/6] 110 0
30 NGC 6567 PN 18 13 45.1636643352 -19 04 34.071637152     10.9     [WC5/6] 277 0
31 NGC 6578 PN 18 16 16.5071627654 -20 27 02.743192002           [WC4/6] 211 0
32 PN Cn 3-1 PN 18 17 34.1015035728 +10 09 03.304908396   12.93 12.49 12.35   07Ib(f) 224 0
33 PN K 1-16 PN 18 21 52.1086837968 +64 21 53.406292104   14.44 14.96 15.26   PG1159 258 0
34 SH 2-68 PN 18 24 58.4294414904 +00 51 36.021249072   16.0 16.5     DAOZ.6 134 1
35 NGC 6629 PN 18 25 42.4541775576 -23 12 10.551587436   11.90 9.9     [WC5/6] 271 0
36 PN M 1-46 PN 18 27 56.3175434256 -15 32 54.434037264     12.83     O(H)7I(fc) 129 0
37 PN Vy 2-1 PN 18 27 59.6260402536 -26 06 48.065269284   12.8 13.20     [WC] 94 0
38 PN M 1-60 PN 18 43 38.0929948608 -13 44 49.280634744           [WC4] 95 0
39 PN M 1-62 PN 18 50 26.0470300152 -22 34 22.707895260           [WC] 54 0
40 PN Sp 4-1 PN 19 00 26.5460404944 +38 21 07.280102016       15.26   O? 40 0
41 NGC 6803 PN 19 31 16.4826019750 +10 03 21.620200381   13.034 11.616 13.242   ~ 254 0
42 PN M 1-71 PN 19 36 26.9207484077 +19 42 24.018831075           [WC] 92 1
43 PN M 1-73 PN 19 41 09.2937490896 +14 56 58.980006096           O3.5If 85 1
44 NGC 6818 PN 19 43 57.770472 -14 09 13.36932     9.3     ~ 357 1
45 NGC 6879 PN 20 10 26.6930056361 +16 55 21.272110541   13.661 12.540 14.075   O3f(He) 157 0
46 NGC 6891 PN 20 15 08.8435405584 +12 42 15.584146740   12.11 12.51     O3Ib(f*) 405 0
47 IC 4997 PN 20 20 08.7557973960 +16 43 53.698933380   11.94 11.15     [WC7/8] 555 0
48 PN A66 78 PN 21 35 29.3816259120 +31 41 45.449196108   13.04 13.25     [WC5] 336 0
49 NGC 7094 PN 21 36 52.9687364088 +12 47 19.099274136     13.650 13.775   sdB/sdO 207 0
50 IC 5217 PN 22 23 55.7180137224 +50 58 00.464340252     15.5     [WC7] 314 0
51 PN Jn 1 PN 23 35 53.3214838680 +30 28 06.336745212   15.52 15.62     DOZ 110 0

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