2012MNRAS.423..934M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET17:54:51

2012MNRAS.423..934M - Mon. Not. R. Astron. Soc., 423, 934-947 (2012/June-2)

IC 4663: the first unambiguous [WN] Wolf–Rayet central star of a planetary nebula.

MISZALSKI B., CROWTHER P.A., DE MARCO O., KOPPEN J., MOFFAT A.F.J., ACKER A. and HILLWIG T.C.

Abstract (from CDS):

We report on the serendipitous discovery of the first central star of a planetary nebula (PN) that mimics the helium- and nitrogen-rich WN sequence of massive Wolf-Rayet (WR) stars. The central star of IC 4663 (PN G346.2-08.2) is dominated by broad He II and N V emission lines which correspond to a [WN3] spectral type. Unlike previous [WN] candidates, the surrounding nebula is unambiguously a PN. At an assumed distance of 3.5 kpc, corresponding to a stellar luminosity of 4000 L, the V= 16.9 mag central star remains 4-6 mag fainter than the average luminosity of massive WN3 stars even out to an improbable d= 8 kpc. The nebula is typical of PNe with an elliptical morphology, a newly discovered asymptotic giant branch (AGB) halo, a relatively low expansion velocity (vexp= 30 km/s) and a highly ionized spectrum with an approximately solar chemical abundance pattern. The [WN3] star is hot enough to show Ne VII emission (T*= 140±20 kK) and exhibits a fast wind (v= 1900 km/s), which at d= 3.5 kpc would yield a clumped mass-loss rate of {img}= 1.8 {x} 10–8 M/yr with a small stellar radius (R*= 0.11 R). Its atmosphere consists of helium (95 per cent), hydrogen (<2 per cent), nitrogen (0.8 per cent), neon (0.2 per cent) and oxygen (0.05 per cent) by mass. Such an unusual helium-dominated composition cannot be produced by any extant scenario used to explain the H-deficiency of post-AGB stars. The O(He) central stars share a similar composition and the discovery of IC 4663 provides the first evidence for a second He-rich/H-deficient post-AGB evolutionary sequence [WN] -> O(He). This suggests that there is an alternative mechanism responsible for producing the majority of H-deficient post-AGB stars that may possibly be expanded to include other He-rich/H-deficient stars such as R Coronae Borealis stars and AM Canum Venaticorum stars. The origin of the unusual composition of [WN] and O(He) central stars remains unexplained.

Based on observations made with Gemini South under programme GS-2011A-Q-65 (PI: B. Miszalski).


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: mass-loss - stars: Wolf-Rayet - planetary nebulae: general - planetary nebulae: individual: PN G346.2-08.2

Simbad objects: 29

goto Full paper

goto View the reference in ADS

Number of rows : 29

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 HD 9974 WR* 01 38 55.6271504593 +58 09 22.671823428 9.85 10.71 10.69     WN3h-w 159 0
2 NGC 1501 PN 04 06 59.3919688584 +60 55 14.277444117   15.17 13.0     [WO4] 283 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15214 1
4 SMP LMC 83 PN 05 36 20.7216020344 -67 18 07.659774493 15.56 16.225 14.948   16.558 [WN4.5:] 140 0
5 PN K 1-27 PN 05 57 02.1748480138 -75 40 22.475592752     16.04 16.27 16.41 sdOHe 80 0
6 V* V445 Pup No* 07 37 56.8797662756 -25 56 58.836792684           ~ 147 0
7 PN G272.8+01.0 PN 09 28 40.6 -49 36 44           [WC4:] 18 1
8 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 395 0
9 PN Fg 1 PN 11 28 36.2238250551 -52 56 04.118262147   13.1 12.20     ~ 160 0
10 PN PB 8 PN 11 33 17.8154413787 -57 06 14.926075766     14.00     [WC5/6] 109 0
11 ESO 320-28 PN 11 52 29.2564882729 -42 17 38.944225510           ~ 52 0
12 V* GW Vir WD* 12 01 45.9728868857 -03 45 40.627851273   14.87 15.04     DOQZ1 468 0
13 HD 104994 WR* 12 05 18.7203813373 -62 03 10.139083749 9.95 10.94 10.93 11.03   WN3p-w 156 0
14 WR 47a WR* 12 45 51.2509108395 -64 09 38.049177096   17.25 15.30     WN8h 23 0
15 PMR 5 WR* 16 19 40.1911099790 -49 13 59.027412470           [WN6]: 31 2
16 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 446 0
17 PN G333.4-04.3 PN 16 41 04.3868766499 -53 02 24.693327763           [WC4]pec 12 1
18 IC 4663 PN 17 45 28.6294985056 -44 54 17.982999895           [WN3] 93 0
19 PN A66 48 PN 18 42 46.9212159851 -03 13 17.299855752   19.40   16.67   [WN6o] 56 0
20 NGC 6751 PN 19 05 55.5385116189 -05 59 32.291075445   15.78 15.48     [WC4] 321 0
21 Hen 2-427 WR* 19 11 30.8750511254 +16 51 38.199008052   12.19 11.50     WN8h 322 0
22 V* RY Sgr RC* 19 16 32.7669543079 -33 31 20.337025534 6.20 6.27 6.25     Cpec 356 0
23 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 925 0
24 V* RR Tel Sy* 20 04 18.5382966387 -55 43 33.154224077 9.93 11.33 10.81     WN3-6.5+M3.5-7 518 0
25 HD 192163 WR* 20 12 06.5420067895 +38 21 17.783840972 7.12 7.49 7.50     WN6(h)-s 524 0
26 NGC 6888 ISM 20 12 07 +38 21.3   7.44       WN6b(h) 262 1
27 V* PU Vul No* 20 21 13.3112218215 +21 34 18.693825946   11.13 10.87     A4II-F8Iab+M6IIIe 297 0
28 HD 211564 WR* 22 16 24.0322637172 +55 37 36.763974776   11.72 11.61     WN3(h)-w 115 0
29 NAME Galactic Bulge reg ~ ~           ~ 3535 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012MNRAS.423..934M and select 'bookmark this link' or equivalent in the popup menu


2021.03.05-17:54:51

© Université de Strasbourg/CNRS

    • Contact