1995A&A...299..151H


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.29CEST18:31:02

1995A&A...299..151H - Astronomy and Astrophysics, volume 299, 151-162 (1995/7-1)

Spectral analyses of the Galactic Wolf-Rayet stars: hydrogen-helium abundances and improved stellar parameters for the WN class.

HAMANN W.-R., KOESTERKE L. and WESSOLOWSKI U.

Abstract (from CDS):

Almost all known Galactic single WN stars have been analyzed applying non-LTE models for spherically expanding atmospheres. While in a previous study we performed "coarse" spectral analyses based essentially on helium-line equivalent widths compared to a grid of models, we now present improved results from 25 detailed "fine" analyses, i.e. from fitting the line profiles with individual model calculations. The non-LTE models applied now account for a helium-hydrogen composition, and corresponding abundances are determined for each star. 53% of the studied Galactic WN stars (33 out of 62) are hydrogen-free, populating a luminosity range from 104.6 to 105.7L. The occurrence of hydrogen is restricted to those WN stars with lowest stellar temperatures (30...35kK, with few exceptions), comprising most stars of late subtype (WNL) and part of the weak-lined early-type WN stars (WNE-w). But all WN stars are definitely hydrogen-deficient, compared to the solar value. Most WN stars showing hydrogen exhibit mass fractions βH between 10% and 30%. They cover the whole luminosity range of the the hydrogen-free WN stars, but extend also to higher values: a group of ten WNL stars with hydrogen is brighter than 105.7L, i.e. brighter than any hydrogen-free WN star. Only three WN stars are found with hydrogen mass fractions as small as ≃5%. A small group of four WN7 stars with high luminosities (>105.6L) has outstandingly high hydrogen mass fractions (40...53%). The gradual switching from the high mass-loss rates of the hydrogen-free WN stars to the much lower mass-loss rates of typical OB stars is found to be correlated with the hydrogen abundance.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: fundamental parameters - Hertzsprung-Russell (HR) diagram - stars: mass loss - stars: Wolf-Rayet

Status at CDS:  

Simbad objects: 72

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Number of rows : 72

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 4004 WR* 00 43 28.3971235391 +64 45 35.383738645 10.28 10.718 10.138     WN4-s 177 0
2 HD 6327 WR* 01 05 23.0143603 +60 25 18.965197   11.49 11.33     WN2-w 106 0
3 HD 9974 WR* 01 38 55.6271504593 +58 09 22.671823428 9.85 10.71 10.69     WN3h-w 154 0
4 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 733 0
5 HD 56925 WR* 07 18 29.1313276537 -13 13 01.513156589 11.21 11.74 11.56 11.40   WN4b 153 0
6 HD 65865 WR* 07 59 46.2452165709 -28 44 03.084742445 10.62 11.20 10.90 11.16   WN5h 96 0
7 CD-45 4482 WR* 08 44 47.2902196838 -45 58 55.414166402 10.95 11.29 10.74 10.58   WN8h+? 96 0
8 HD 86161 WR* 09 54 52.9034376427 -57 43 38.273623332 7.94 8.65 8.36 8.93   WN8h 199 0
9 HD 89358 WR* 10 17 02.2741836044 -57 54 46.871795579 11.1 11.19 10.83 10.59   WN4-s 157 1
10 WR 20 WR* 10 19 18.4020182129 -59 09 38.850146550   15.34 14.60     WN5-w 33 0
11 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 378 0
12 HD 93131 WR* 10 43 52.2575981063 -60 07 04.016913264 5.52 6.43 6.48 7.46   WN6ha-w 272 0
13 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 331 1
14 WR 28 WR* 10 48 58.7235338702 -59 03 37.303699221   13.70 12.98     WN6(h)-w 29 0
15 THA 35-II-117 WR* 10 50 46.2932996756 -60 28 41.246441676   13.29 12.36 12.05   WN7h+O 41 0
16 WR 34 WR* 11 00 06.4565379740 -61 26 30.107771412   15.26 14.50     WN5-w 30 0
17 WR 35 WR* 11 00 21.86 -61 13 52.3   14.58 13.83     WN6h-w 31 0
18 WR 36 WR* 11 02 32.9786581120 -59 26 20.908131146   13.90 12.94 12.86   WN5-s 32 0
19 WR 37 WR* 11 05 13.9025929090 -61 20 41.184951648   17.40 16.0     WN4-s 36 0
20 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 386 0
21 MR 39 WR* 11 16 57.8367853584 -59 26 23.891767387   13.04 12.79 12.71   WN4-w 49 0
22 HD 104994 WR* 12 05 18.7203813373 -62 03 10.139083749 9.95 10.94 10.93 11.03   WN3p-w 152 0
23 WR 49 WR* 13 13 51.3090989970 -65 18 08.897671074   13.59 13.40 13.51   WN5(h)-w 38 0
24 MR 45 WR* 13 18 23.3593856408 -62 28 21.220292118   15.53 14.32 13.97   WN4-w 44 0
25 MR 48 WR* 13 32 43.7631500403 -65 01 27.835643271 12.85 13.20 12.73 12.61   WN5-w 51 0
26 HD 117688 WR* 13 33 30.1195029290 -62 19 01.211515819 8.69 10.81 10.90 10.44   WN7 116 0
27 MR 51 WR* 13 49 04.4894389061 -65 41 56.120790651 12.75 12.95 12.71 12.89   WN5 55 0
28 MR 53 WR* 14 13 03.5249088603 -65 26 52.708243005 11.93 12.51 12.32 12.21   WN5-w 64 0
29 WRAY 16-154 WR* 14 31 06.13 -61 20 59.5   15.82 14.22     WN6-s 30 1
30 WRAY 15-1254 WR* 14 50 58.2650618251 -59 51 26.428849251 14.29 13.96 12.47 11.85   WN6 40 0
31 HD 134877 WR* 15 14 57.7490917148 -59 50 30.232117350 12.13 12.19 11.34 11.08   WN8(h) 94 0
32 MR 55 WR* 15 15 32.6263216950 -59 02 30.692489276 12.46 12.56 11.84 11.63   WN6-w 63 0
33 HD 143414 WR* 16 03 49.3451223381 -62 41 35.942835918 9.32 10.03 10.10     WN6-w 100 0
34 WR 74 WR* 16 16 13.81 -51 36 41.8   15.53 14.01     WN7 25 0
35 HD 147419 WR* 16 24 26.2278740665 -51 32 06.062121260   11.46 10.50 10.74   WN6-s 104 0
36 HD 151932 WR* 16 52 19.2478420644 -41 51 16.269632432 6.06 6.79 6.51 7.64   WN7h 290 0
37 WRAY 15-1600 WR* 17 04 04.6347450070 -45 12 15.059699813 12.95 13.00 11.55 11.85   WN7(h) 43 0
38 MR 67 WR* 17 10 54.6275136033 -46 36 00.577179537   13.15 12.50 12.28   WN6 36 0
39 THA 31-1 WR* 17 11 21.7005819428 -39 53 21.977257211   14.18 13.01 12.54   WN7 36 0
40 LS 3982 WR* 17 14 27.1191115555 -39 45 47.053559348 10.63 10.95 10.41     WN6h-w 62 0
41 WRAY 15-1666 WR* 17 18 52.8750745581 -38 50 03.606959080 13.93 13.27 11.83 11.43   WN7 65 0
42 CD-38 11746 WR* 17 19 00.5230727136 -38 48 51.250086613 13.01 12.48 11.02 10.55   WN8h 88 0
43 WR 91 WR* 17 20 22.0232742995 -38 56 48.379201459   17.70 16.2     WN7 32 0
44 HD 158860 WR* 17 33 07.0669567120 -33 38 23.500757398   12.20 10.69 10.38   WN5-w 47 0
45 HD 318139 WR* 17 42 09.7605770497 -32 33 24.800534509   13.93 12.78 12.20   WN7 43 0
46 EM* AS 268 WR* 18 02 23.4579211710 -23 34 37.481060535   14.38 12.31 11.43   WN9h 95 0
47 SS73 123 WR* 18 04 46.0977446521 -21 51 27.157890594   15.00 13.51 12.80 11.35 WN8 29 0
48 HD 313846 WR* 18 05 25.7345590489 -23 00 20.335027460 10.48 10.69 9.89 9.89   WN9h+OB 122 0
49 WR 109 WR* 18 07 50.8974693468 -35 10 25.119230585           WN3 51 0
50 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 142 0
51 MR 87 WR* 18 25 30.0233828772 -14 38 41.034349989 13.38 13.09 11.86 11.33   WN6-w 70 0
52 EM* AS 306 WR* 18 27 04.2927141192 -12 22 52.681549543   14.79       WN8h 45 0
53 MR 89 WR* 18 41 00.8669826586 -04 26 14.473452479 13.1 12.97 11.93 11.67   WN7 65 2
54 HD 177230 WR* 19 03 59.0232385542 -04 19 01.911120922 11.32 11.60 11.12     WN8 158 0
55 Hen 2-427 WR* 19 11 30.8750511254 +16 51 38.199008052   12.19 11.50     WN8h 310 0
56 MR 96 WR* 19 48 18.2649973585 +30 26 52.670591228   13.3 13.4     WN4-w 32 0
57 HD 187282 WR* 19 48 32.1968574697 +18 12 03.693991312 9.60 10.49 10.51     WN4(h)-w 180 0
58 EM* AS 374 WR* 19 59 12.5938476816 +31 27 09.011482722   13.57 12.13 11.52   WN8(h) 59 1
59 MR 97 WR* 20 00 19.1224209318 +33 15 51.098849239 12.93 13.050 12.080     WN7h 69 0
60 HD 191765 WR* 20 10 14.1929815789 +36 10 35.069005168 7.64 8.08 8.08     WN6-s 417 0
61 HD 192163 WR* 20 12 06.5420067895 +38 21 17.783840972 7.12 7.49 7.50     WN6(h)-s 514 0
62 HD 193077 WR* 20 17 00.0264117871 +37 25 23.780238760 7.82 8.32 8.01 8.71   WN5-w+B? 276 0
63 HD 193928 WR* 20 21 31.7290292758 +36 55 12.769017074 10.67 10.60 9.78     WN5-w+O5V-III 185 0
64 EM* AS 431 WR* 20 36 43.6 +40 21 08   17.04 14.89     WN8(h)+B0.5V 204 2
65 HD 197406 WR* 20 41 21.5486849958 +52 35 15.140677138 10.42 10.87 10.30     WN8h+B3IV/BH 184 0
66 WR 149 WR* 21 07 11.6932466487 +48 25 36.238906743   15.90 14.70     WN5-s 41 0
67 HD 211564 WR* 22 16 24.0322637172 +55 37 36.763974776   11.72 11.61     WN3(h)-w 112 0
68 HD 214419 WR* 22 36 53.9549498582 +56 54 20.985957352 8.68 9.21 8.80     WN6o+O9Ib/II 358 1
69 MR 119 WR* 23 00 10.1254033879 +60 55 38.409749646 11.85 12.18 11.01     WN8h 90 0
70 HD 219460 ** 23 15 12.39033 +60 27 01.8129 10.23 10.51 9.89     B1II+WN4.5 128 0
71 HD 219460A * 23 15 12.394 +60 27 01.84   10.96 10.57     B1II 124 0
72 EM* AS 513 WR* 23 43 30.5961785796 +61 55 48.136617629 12.02 11.98 11.282     WN7h+Be? 64 0

    Equat.    Gal    SGal    Ecl

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2020.03.29-18:31:02

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