2019AJ....158..192L


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.22CEST09:50:56

2019AJ....158..192L - Astron. J., 158, 192-192 (2019/November-0)

He II emission from Wolf-Rayet stars as a tool for measuring dust reddening.

LEITHERER C., LEE J.C. and FAISST A.

Abstract (from CDS):

We calibrated a technique to measure dust attenuation in star-forming galaxies. The technique utilizes the stellar-wind lines in Wolf-Rayet stars, which are widely observed in galaxy spectra. The He II 1640 and 4686 features are recombination lines whose ratio is largely determined by atomic physics. Therefore they can serve as a stellar dust probe in the same way as the Balmer lines are used as a nebular probe. We measured the strength of the He II 1640 line in 97 Wolf-Rayet stars in the Galaxy and the Large Magellanic Cloud. The reddening corrected fluxes follow a tight correlation with a fixed ratio of 7.76 for the He II 1640 to 4686 line ratio. Dust attenuation decreases this ratio. We provide a relation between the stellar E(B-V) and the observed line ratio for several attenuation laws. Combining this technique with the use of the nebular Balmer decrement allows the determination of the stellar and nebular dust attenuation in galaxies and can probe its effects at different stellar age and mass regimes, independently of the initial mass function and the star formation history. We derived the dust reddening from the He II line fluxes and compared it to the reddening from the Balmer decrement and from the slope of the ultraviolet continuum in two star-forming galaxies. The three methods result in dust attenuations which agree to within the errors. Future application of this technique permits studies of the stellar dust attenuation compared to the nebular attenuation in a representative galaxy sample.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Wolf-Rayet stars - Interstellar dust extinction - Interstellar medium - Stellar populations - Young star clusters - Starburst galaxies

VizieR on-line data: <Available at CDS (J/AJ/158/192): table1.dat table2.dat table3.dat table4.dat>

CDS comments: Clusters A2-A4 (=[SSC2006] Cluster AN) are not in Simbad (not enough information).

Simbad objects: 115

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Number of rows : 115

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11349 1
2 HD 4004 WR* 00 43 28.3971235391 +64 45 35.383738645 10.28 10.718 10.138     WN4-s 188 0
3 SMC AB 1 WR* 00 43 42.3082179697 -73 28 55.260280231 14.33 15.20 15.24   15.21 WN3+O4: 29 0
4 SMC AB 2 WR* 00 48 30.8442971820 -73 15 45.831809104 13.23 14.23 14.43   14.52 WN4.5/O3 47 0
5 LIN 143 WR* 00 49 59.3503462072 -73 22 14.123185037 13.48 14.43 14.56   14.57 WN3/4+O4 36 0
6 LIN 160 WR* 00 50 43.43 -73 27 05.7 12.363 13.304 13.426   13.55 WN6 46 0
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9842 1
8 RMC 31 WR* 01 03 25.2276668802 -72 06 43.858552056   12.11 12.30     WN3:h+O5.5V+O5.5If+O7.5V 109 0
9 SMC AB 7 WR* 01 03 35.9234112413 -72 03 22.120394056 11.933 12.954 13.016   13.32 WN4+O6I(f) 46 0
10 HD 6327 WR* 01 05 23.0143603 +60 25 18.965197   11.49 11.33     WN2-w 114 0
11 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5309 1
12 HD 9974 WR* 01 38 55.6271504593 +58 09 22.671823428 9.85 10.71 10.69     WN3h-w 162 0
13 Brey 1 WR* 04 45 32.2722764850 -70 15 10.893009986 15.001 15.711 15.92 15.75 15.643 WN3b 36 0
14 Brey 2 WR* 04 49 36.2531142789 -69 20 54.747527445 15.633 16.495 16.579   16.447 WN2b(h) 34 0
15 Brey 3 WR* 04 52 57.3973799275 -66 41 13.495098750 13.793 14.531 14.640   14.527 WN4b 36 0
16 HD 32109 WR* 04 55 31.3419672483 -67 30 02.683822100 12.893 13.46 13.81 13.95 13.512 WN4b 71 0
17 Brey 10a WR* 04 57 27.4549113851 -67 39 02.868479987 12.213 13.314 13.496   13.564 O2If*/WN5 54 1
18 LHA 120-S 9 WR* 04 57 41.0340462291 -66 32 42.554870210 12.191 12.91 12.82 12.91 11.781 WN10 50 0
19 HD 268856 WR* 04 58 56.3627926026 -68 48 04.730973756   12.130 10.827 10.34 9.33 WN4o(+OB) 38 0
20 HD 268847 WR* 04 59 51.5599828055 -67 56 55.440010992 13.658 14.21 14.58 14.75 14.426 WN4b 51 0
21 HD 33133 WR* 05 03 08.9129394547 -66 40 57.494039004   12.46 12.63 12.85   WN7h 89 0
22 HD 269015 WR* 05 04 12.3242039777 -70 03 55.403600765 13.183 14.07 14.28 14.40 14.108 WN4o 44 0
23 Brey 15 WR* 05 05 08.4204405618 -70 22 45.124510417 13.572 14.47 14.62 14.81 14.714 WN3(h) 36 0
24 HD 34169 WR* 05 09 40.4192565947 -68 53 24.755119043 12.773 13.47 13.65 14.02 13.697 WN4b+O5: 61 1
25 HD 34187 Be? 05 09 50.2077658246 -68 53 49.145673690   14.38 14.41     ~ 13 1
26 HD 269227 WR* 05 13 54.2798782060 -69 31 46.659015245 11.429 11.98 11.918 12.13 10.557 WN9/10+M2Ia 152 0
27 HD 34783 WR* 05 14 12.7026819643 -69 19 26.109719984 13.668 14.115 14.49 14.55 14.150 WN4b 42 0
28 Brey 20 WR* 05 16 38.8429450210 -69 16 40.829526451 13.791 14.345 14.48 15.05 14.336 WN4b 36 0
29 HD 269333 WR* 05 18 19.2101847037 -69 11 40.655834630 10.375 11.23 11.29 11.47 11.412 WN+BI 57 0
30 Brey 23 WR* 05 20 44.7284628858 -65 28 20.444855910 13.774 14.43 14.65 14.87 14.534 WN4b+OB 37 0
31 LHA 120-S 28 WR* 05 21 57.6943623106 -65 49 00.226696063 12.395 13.12 13.32 13.62 13.295 WN6h 43 0
32 Brey 25 WR* 05 22 04.4095841528 -67 59 06.779107874 14.589 15.326 15.207   14.993 WN4b 36 0
33 HD 36063 WR* 05 22 22.5297442838 -71 35 58.151974584 11.583 12.43 12.66 12.85 12.602 WN7 66 0
34 HD 269445 WR* 05 22 59.7854939490 -68 01 46.634598597 10.79 11.77 11.520 11.41 10.979 Ofpe/WN9 111 0
35 Brey 27 WR* 05 23 18.0134479119 -65 56 56.946620174 13.870 14.624 14.876   14.929 WN3(h) 35 0
36 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15433 1
37 HD 269485 WR* 05 24 24.1937327527 -68 31 35.596373567 13.593 14.40 14.46 14.39 14.574 WN4b/WCE+OB 55 0
38 HD 269549 WR* 05 26 42.5911221786 -69 06 57.346912373 14.308 14.53 14.76 15.11 14.589 WN4b 43 0
39 HD 269546 WR* 05 26 45.3199315750 -68 49 52.786974246 9.00 9.83 9.86 9.76 9.76 WN5b(h)+B3I 103 0
40 Brey 37 WR* 05 27 37.6899657541 -70 36 05.320790978 12.875 13.85 14.07 14.43 14.249 WN4o+OB 38 0
41 LHA 120-S 108 WR* 05 27 42.6937243511 -69 10 00.381363164 12.243 13.232 13.41 13.67 13.287 WN8ha 40 0
42 Brey 38 WR* 05 28 17.9144901496 -69 02 35.894956119   15.22 15.26     WN4o 30 0
43 HD 269624 WR* 05 29 31.6378583206 -68 54 28.817861004 14.008 14.491 14.781 14.81 14.703 WN4b 43 1
44 Brey 40a WR* 05 29 33.2066825323 -70 59 34.838593733 12.472 13.20 13.39 13.90 13.743 WN4:b+O8V 40 0
45 HD 269687 WR* 05 31 25.5247019885 -69 05 38.555025424 10.86 11.78 11.87 12.05   WN11h 99 0
46 HD 269692 WR* 05 31 32.8700526346 -67 40 46.607545991 13.592 14.28 14.49 14.70 14.519 WN4b 44 0
47 Brey 45 WR* 05 31 34.3665416131 -67 16 29.330394365 14.146 14.696 14.897 15.02 14.835 WN4b 30 0
48 Brey 47 WR* 05 32 07.4961925425 -68 26 31.571311710 14.772 15.35 14.97 15.02 14.373 WN7h 32 0
49 HD 269748 WR* 05 33 10.5705967402 -67 42 43.055762502 12.093 13.054 13.186   12.828 WN4b+O8: 48 0
50 Brey 52 WR* 05 34 52.0246318634 -67 21 28.976682258 13.624 14.451 14.597 14.84 14.719 WN4ha: 41 0
51 Brey 58 WR* 05 35 42.2160 -69 11 54.240   14.62 14.13     O3If*/WN6 37 0
52 HD 269848 WR* 05 35 54.0300531624 -67 02 48.969634432 13.694 14.06 14.34 14.65 14.440 WN4o 33 0
53 LHA 120-S 125 WR* 05 35 54.3750953895 -68 59 07.889523700 12.463 13.324 13.266 13.33 12.609 WN9ha 69 0
54 Brey 57 WR* 05 35 59.8169082147 -69 11 22.218225371 13.143 13.784 13.486   12.060 WN7ha+OB 32 0
55 Brey 65a WR* 05 36 12.1332078789 -67 34 57.777217161 14.609 15.504 15.394   15.173 WN5h 16 0
56 Brey 66 WR* 05 36 33.58 -69 09 17.3 15.636 15.937 16.108   15.627 WN3b 29 0
57 HD 269883 WR* 05 37 40.494 -69 07 57.71 13.454 14.184 14.077 14.03 13.492 WN7h 41 0
58 HD 269891 WR* 05 37 49.0345689657 -69 05 08.219994930 11.791 9.447 11.39 11.55   WN6+B1Ia 67 0
59 RMC 135 WR* 05 38 33.62 -69 04 50.4   12.63 13.48     WN7h+OB 56 0
60 HD 38282 WR* 05 38 53.3788120199 -69 02 00.896643506   10.98 11.11 11.26   WN5/6h+WN6/7h 153 1
61 HD 269928 WR* 05 38 57.0668705166 -69 06 05.660972436   12.02 11.94 12.00 11.58 WN6/7 122 0
62 W61 3-8 WR* 05 38 58.0966488330 -69 29 19.556379292       12.51 12.43 WN9h 50 0
63 HD 38344 WR* 05 39 11.3191294608 -69 02 01.572235036 12.323 13.04 12.993 13.07 12.574 WN5h 67 0
64 Brey 99 WR* 05 45 24.1680078197 -67 05 56.734976254 14.221 14.69 14.81 14.88 14.371 WN4b(h) 35 0
65 LHA 120-S 61 WR* 05 45 51.9393679113 -67 14 25.939050679 10.870 11.86 11.95 12.09 11.931 WN11h 78 0
66 HD 270149 WR* 05 46 46.3466957956 -67 09 58.269764283 14.025 14.20 14.48 14.76 14.524 WN4b 51 0
67 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 749 0
68 HD 56925 WR* 07 18 29.1313276537 -13 13 01.513156589 11.21 11.74 11.56 11.40   WN4b 163 0
69 HD 62910 WR* 07 44 58.2216344436 -31 54 29.553631132 10.08 10.44 10.10 10.17   WN6/WC4 119 0
70 HD 65865 WR* 07 59 46.2452165709 -28 44 03.084742445 10.62 11.20 10.90 11.16   WN5h 101 0
71 CD-45 4482 WR* 08 44 47.2902196838 -45 58 55.414166402 10.95 11.29 10.74 10.58   WN8h+? 101 0
72 NGC 3049 EmG 09 54 49.651 +09 16 17.90   13.04       ~ 296 1
73 HD 86161 WR* 09 54 52.9034376427 -57 43 38.273623332 7.94 8.65 8.36 8.93   WN8h 208 0
74 HD 89358 WR* 10 17 02.2741836044 -57 54 46.871795579 11.1 11.19 10.83 10.59   WN4-s 165 1
75 HD 90657 WR* 10 26 31.4088129340 -58 38 26.179161012 9.53 10.07 9.65 9.84   WN5+O4-6 150 0
76 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 389 0
77 HD 93131 WR* 10 43 52.2575981063 -60 07 04.016913264 5.52 6.43 6.48 7.46   WN6ha-w 283 0
78 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 344 1
79 HD 94546 WR* 10 53 44.8196302 -59 30 46.694249 10.38 10.94 10.51 10.48   WN4+O8V 114 0
80 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 396 0
81 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 60 0
82 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 983 1
83 MR 39 WR* 11 16 57.8367853584 -59 26 23.891767387   13.04 12.79 12.71   WN4-w 51 0
84 HD 104994 WR* 12 05 18.7203813373 -62 03 10.139083749 9.95 10.94 10.93 11.03   WN3p-w 159 0
85 HD 311884 WR* 12 43 50.9989169468 -63 05 14.811840934 11.45 11.64 10.81 10.59   WN6+O5V 159 0
86 HD 117688 WR* 13 33 30.1195029290 -62 19 01.211515819 8.69 10.81 10.90 10.44   WN7 122 0
87 MR 51 WR* 13 49 04.4894389061 -65 41 56.120790651 12.75 12.95 12.71 12.89   WN5 58 0
88 [SSC2006] Cluster A1 Cl* 14 01 19.92 -33 04 10.7           ~ 6 0
89 Tol 89 HII 14 01 20.082 -33 04 11.06           ~ 38 1
90 NGC 5398 LSB 14 01 21.555 -33 03 49.62   12.87 12.39 11.99 12.6 ~ 115 1
91 MR 53 WR* 14 13 03.5249088603 -65 26 52.708243005 11.93 12.51 12.32 12.21   WN5-w 69 0
92 HD 143414 WR* 16 03 49.3451223381 -62 41 35.942835918 9.32 10.03 10.10     WN6-w 106 0
93 HD 147419 WR* 16 24 26.2278740665 -51 32 06.062121260   11.46 10.50 10.74   WN6-s 106 0
94 HD 151932 WR* 16 52 19.2478420644 -41 51 16.269632432 6.06 6.79 6.51 7.64   WN7h 300 0
95 LS 3982 WR* 17 14 27.1191115555 -39 45 47.053559348 10.63 10.95 10.41     WN6h-w 65 0
96 HD 313846 WR* 18 05 25.7345590489 -23 00 20.335027460 10.48 10.69 9.89 9.89   WN9h+OB 127 0
97 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 148 0
98 HD 177230 WR* 19 03 59.0232385542 -04 19 01.911120922 11.32 11.60 11.12     WN8 164 0
99 HD 186943 WR* 19 46 15.9393000440 +28 16 19.074048808 9.86 10.50 10.23     WN3+O9.5V 179 1
100 HD 187282 WR* 19 48 32.1968574697 +18 12 03.693991312 9.60 10.49 10.51     WN4(h)-w 187 0
101 HD 190918 WR* 20 05 57.3242972785 +35 47 18.153743699 6.11 6.88 6.75     WN5+O9I 348 0
102 HD 191765 WR* 20 10 14.1929815789 +36 10 35.069005168 7.64 8.08 8.08     WN6-s 429 0
103 HD 192163 WR* 20 12 06.5420067895 +38 21 17.783840972 7.12 7.49 7.50     WN6(h)-s 526 0
104 HD 193077 WR* 20 17 00.0264117871 +37 25 23.780238760 7.82 8.32 8.01 8.71   WN5-w+B? 280 0
105 HD 193928 WR* 20 21 31.7290292758 +36 55 12.769017074 10.67 10.60 9.78     WN5-w+O5V-III 189 0
106 HD 197406 WR* 20 41 21.5486849958 +52 35 15.140677138 10.42 10.87 10.30     WN8h+B3IV/BH 189 0
107 MR 114 WR* 22 09 33.4427302357 +57 44 30.525316054 12.78 12.91 12.12     WN4+O5V 134 0
108 HD 211564 WR* 22 16 24.0322637172 +55 37 36.763974776   11.72 11.61     WN3(h)-w 116 0
109 HD 211853 WR* 22 18 45.6058273717 +56 07 33.896665584 8.84 9.39 9.00     WN6o+O6I 264 0
110 HD 214419 WR* 22 36 53.9549498582 +56 54 20.985957352 8.68 9.21 8.80     WN6o+O9Ib/II 364 1
111 MR 119 WR* 23 00 10.1254033879 +60 55 38.409749646 11.85 12.18 11.01     WN8h 92 0
112 HD 219460 ** 23 15 12.39033 +60 27 01.8129 10.23 10.51 9.89     B1II+WN4.5 130 0
113 HD 219460B WR* 23 15 12.542 +60 27 01.00   11.32 10.75     WN4.5 8 0
114 EM* AS 513 WR* 23 43 30.5961785796 +61 55 48.136617629 12.02 11.98 11.282     WN7h+Be? 66 0
115 [SSC2006] Cluster B1 Cl* ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.06.22-09:50:56

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