1997A&A...320..500C


Query : 1997A&A...320..500C

1997A&A...320..500C - Astronomy and Astrophysics, volume 320, 500-524 (1997/4-2)

Fundamental parameters of Wolf-Rayet stars. VI. Large Magellanic Cloud WNL stars.

CROWTHER P.A. and SMITH L.J.

Abstract (from CDS):

We present a detailed, quantitative study of late WN (WNL) stars in the LMC, based on new optical spectroscopy (AAT, MSO) and the Hillier (1990A&A...231..111H) atmospheric model. In a previous paper (Crowther et al. 1995A&A...293..172C), we showed that 4 out of the 10 known LMC Ofpe/WN9 stars should be re-classified WN9-10. We now present observations of the remaining stars (except the LBV R127), and show that they are also WNL (WN9-11) stars, with the exception of R99. Our total sample consists of 17 stars, and represents all but one of the single LMC WN6-11 population and allows a direct comparison with the stellar parameters and chemical abundances of Galactic WNL stars (Crowther et al. 1995A&A...293..403C; Hamann et al. 1995A&A...299..151H). Previously unpublished ultraviolet (HST-FOS, IUE-HIRES) spectroscopy are presented for a subset of our programme stars. We find observational evidence for lower metallicities in LMC WNL stars compared to the Galaxy, though this is not reflected in their stellar properties. For Galactic and LMC stars we find: (i) a similar range in temperature and luminosity, in contrast to evolutionary predictions; (ii) comparable wind performance values ({dot}(M)v/[L/c]) and hydrogen composition, with a broad correlation between increasing helium content and wind performance number; (iii) a general trend to lower wind velocities at lower stellar temperature, with possibly slower winds for LMC WN9-11 stars. Some 30 Dor WNL stars show exceptional properties: Brey 89 (HD38282, WN6h) has the highest luminosity (log (L/L)∼6.25) and mass-loss rate (log({dot}(M)/(M/yr))~-3.6) known for any WR star, while Brey 80 (R135, WN7h) has an enormous wind performance number of 50. The observed physical properties of our sample of LMC WNL stars supports the Crowther et al. (1995A&A...293..427C) evolutionary scheme for Galactic stars, in that the most massive O stars, exclusive to 30 Dor, evolve directly to O3If/WN6 and subsequently WN6-7 stars (e.g. Brey 89), without passing through an intermediate LBV phase. In contrast, lower initial mass stars evolve through a LBV phase, encompassing a WN9-11 stage (e.g. BE 294), with WN8 stars being their immediate successors.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - mass-loss - evolution - fundamental parameters - galaxies: Magellanic Clouds

Simbad objects: 47

goto View the references in ADS

Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Brey 10a WR* 04 57 27.4544617632 -67 39 02.864000880 12.213 13.314 13.496   13.564 O2If*/WN5 54 1
2 LHA 120-S 9 WR* 04 57 41.0338477008 -66 32 42.553604940 12.191 12.91 12.82 12.91 11.781 WN10 50 0
3 HD 33133 WR* 05 03 08.9126630616 -66 40 57.492259824   12.46 12.63 12.85   WN7h 89 0
4 HD 269227 WR* 05 13 54.2756276088 -69 31 46.665067440 11.429 11.98 11.918 12.13 10.557 WN9/10+M2Ia 156 0
5 LHA 120-S 28 WR* 05 21 57.6946827024 -65 49 00.222663684 12.395 13.12 13.32 13.62 13.295 WN6h 43 0
6 HD 36063 WR* 05 22 22.5295596384 -71 35 58.154210736 11.583 12.43 12.66 12.85 12.602 WN7 67 0
7 HD 269445 WR* 05 22 59.7855849168 -68 01 46.635948408 10.79 11.77 11.520 11.41 10.979 Ofpe/WN9 116 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
9 LHA 120-S 108 WR* 05 27 42.6930652824 -69 10 00.379546536 12.243 13.232 13.41 13.67 13.287 WN8ha 40 0
10 HD 269582 WR* 05 27 52.6621673400 -68 59 08.488879836 12.206 10.818 11.093 12.70 11.234 WN10h 99 0
11 Brey 44a WR* 05 31 18.0558143832 -69 08 45.425541264   14.55 14.26 14.26   WN8ha 23 0
12 HD 269687 WR* 05 31 25.5247745448 -69 05 38.556251700 10.86 11.78 11.87 12.05   WN11h 104 0
13 Brey 47 WR* 05 32 07.4960150664 -68 26 31.570497852 14.772 15.35 14.97 15.02 14.373 WN7h 32 0
14 Brey 58 WR* 05 35 42.2160 -69 11 54.240   14.62 14.13     O3If*/WN6 37 0
15 LHA 120-S 125 WR* 05 35 54.3748881672 -68 59 07.890914940 12.463 13.324 13.266 13.33 12.609 WN9ha 69 0
16 BAT99 77 WR* 05 35 58.889 -69 11 47.88           WN7 68 0
17 HD 269828 EB* 05 35 58.91 -69 11 47.3     13.031   12.837 WN7+O3 72 0
18 Brey 57 WR* 05 35 59.8168837680 -69 11 22.217610696 13.143 13.784 13.486   12.060 WN7ha+OB 32 0
19 HD 269858 s*b 05 36 43.6936418088 -69 29 47.451149232   10.24 10.15 9.95 9.05 LBV 276 2
20 HD 269883 WR* 05 37 40.4906298216 -69 07 57.672227892 13.454 14.184 14.077 14.03 13.492 WN7h 42 0
21 Brey 73 WR* 05 37 46.3440 -69 09 09.360   12.222 12.11     WN6(h) 34 1
22 RMC 135 WR* 05 38 33.6193296576 -69 04 50.510501688   12.63 13.48     WN7h+OB 56 0
23 Brey 81 WR* 05 38 36.4071127800 -69 06 57.534295248   14.02 13.76   12.80 WN8 30 0
24 Brey 79 WR* 05 38 39.1442162640 -69 06 21.297619692     13.5 13.33   WN6 30 0
25 Brey 75 WR* 05 38 40.53 -69 05 57.2   12.84 12.75   12.34 WN6h 60 0
26 Cl* NGC 2070 SMB 88 * 05 38 41.88 -69 06 14.4   14.77 14.50   14.82 ~ 18 1
27 HD 38282 WR* 05 38 53.3783458680 -69 02 00.895545204   10.98 11.11 11.26   WN5/6h+WN6/7h 156 1
28 HD 269928 WR* 05 38 57.0667692816 -69 06 05.660419140   12.02 11.94 12.00 11.58 WN6/7 124 0
29 W61 3-8 WR* 05 38 58.0963884840 -69 29 19.558532292       12.51 12.43 WN9h 50 0
30 LHA 120-S 142 WR* 05 44 31.0203138528 -69 20 15.441467316 11.946 12.85 12.71 12.80 12.260 WN11h 29 0
31 LHA 120-S 61 WR* 05 45 51.9388258704 -67 14 25.937264544 10.870 11.86 11.95 12.09 11.931 WN11h 80 0
32 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1125 1
33 HD 92740 WR* 10 41 17.5158425712 -59 40 36.895992960 5.68 6.50 6.42 7.38   WN7h+O9III-V 397 0
34 HD 93131 WR* 10 43 52.2579213120 -60 07 04.019676456 5.52 6.43 6.48 7.46   WN6ha-w 287 0
35 HD 93162 WR* 10 44 10.3890266112 -59 43 11.106500520 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 348 1
36 WRAY 15-682 WR* 10 53 59.5777329720 -60 26 44.361095316   11.64 10.85 10.56   WN11h 143 3
37 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 611 0
38 HD 96548 WR* 11 06 17.2032351624 -65 30 35.241182028 7.10 7.80 7.70 8.49   WN8h 403 0
39 HD 151804 s*b 16 51 33.7218052272 -41 13 49.919519496 4.45 5.29 5.22     O8Iaf 364 0
40 HD 151932 WR* 16 52 19.2477039480 -41 51 16.270066224 6.06 6.79 6.51 7.64   WN7h 302 0
41 HD 152408 s*b 16 54 58.5051071856 -41 09 03.093075612 5.17 5.92 5.77 7.00   O8Iape 362 0
42 HD 152386 s*b 16 55 06.4499424072 -44 59 21.364771956 8.15 8.64 8.13 8.84   O6:Iafpe 79 0
43 HD 316285 s*b 17 48 14.0372119152 -28 00 53.121269592 11.88 11.27 9.60 9.28   B0Ieq 185 2
44 EM* AS 268 WR* 18 02 23.4574037952 -23 34 37.491692196   14.38 12.31 11.43   WN9h 99 0
45 HD 313846 WR* 18 05 25.7344895280 -23 00 20.334949992 10.48 10.69 9.89 9.89   WN9h+OB 128 0
46 MR 97 WR* 20 00 19.1223016752 +33 15 51.099973956 12.93 13.050 12.080     WN7h 76 0
47 Brey 76a WR* ~ ~           ~ 1 0

To bookmark this query, right click on this link: simbad:objects in 1997A&A...320..500C and select 'bookmark this link' or equivalent in the popup menu


2022.05.26-04:55:26

© Université de Strasbourg/CNRS

    • Contact