2016MNRAS.463.2653D

Query : 2016MNRAS.463.2653D

2016MNRAS.463.2653D - Mon. Not. R. Astron. Soc., 463, 2653-2666 (2016/December-2)

Extinction law in the range 0.4-4.8 µm and the 8620 Å DIB towards the stellar cluster Westerlund 1.

DAMINELI A., ALMEIDA L.A., BLUM R.D., DAMINELI D.S.C., NAVARETE F., RUBINHO M.S. and TEODORO M.

Abstract (from CDS):

The young stellar cluster Westerlund 1 (Wd 1: l = 339 .○6, b = -0 .○4) is one of the most massive in the local Universe, but accurate parameters are pending on better determination of its extinction and distance. Based on our photometry and data collected from other sources, we have derived a reddening law for the cluster line-of-sight representative of the Galactic plane (-5° < b <+5°) in the window 0.4-4.8 µm: The power-law exponent α = 2.13 ± 0.08 is much steeper than those published a decade ago (1.6-1.8) and our index RV = 2.50 ± 0.04 also differs from them, but in very good agreement with recent works based on deep surveys in the inner Galaxy. As a consequence, the total extinction AKs = 0.74 ± 0.08 (AV = 11.40 ± 2.40) is substantially smaller than previous results (0.91-1.13), part of which (AKs = 0.63 or AV = 9.66) is from the interstellar medium. The extinction in front of the cluster spans a range of ΔAV ∼8.7 with a gradient increasing from SW to NE across the cluster face, following the same general trend of warm dust distribution. The map of the J - Ks colour index also shows a trend of reddening in this direction. We measured the equivalent width of the diffuse interstellar band at 8620 Å (the 'GAIA DIB') for Wd 1 cluster members and derived the relation AKs = 0.612 EW - 0.191 EW2. This extends the Munari et al. relation, valid for EB–V < 1, to the non-linear regime (AV > 4).

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): dust, extinction - ISM: lines and bands - open clusters and associations: individual: Westerlund 1 - open clusters and associations: individual: Westerlund 1

VizieR on-line data: <Available at CDS (J/MNRAS/463/2653): table2.dat>

Simbad objects: 126

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Number of rows : 126
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 NAME NGC 869/884 OpC 02 20.5 +57 08           ~ 72 0
2 BD+45 973 * 04 43 01.9718619648 +45 37 49.449710388 8.75 9.04 8.63     B3V 26 0
3 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 342 0
4 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
5 HD 94878 ** 10 55 58.9149262296 -60 23 33.436864428 8.67 9.37 8.70 8.07   B0/2eq 159 0
6 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 649 0
7 MR 35 s*b 11 08 40.0634208096 -60 42 51.721320060   12.33 10.20 11.66   LBV 130 0
8 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
9 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 26 0
10 [RCN2009] W3002 s*b 16 46 54.24 -45 51 54.7   23.6 18.93 16.08 13.26 B0Iab 10 0
11 WR 77a WR* 16 46 55.5364791576 -45 51 34.480934408     20.30 17.50 14.70 WN6o 16 0
12 HD 151018 * 16 46 56.1174957336 -45 53 14.312361444 8.9 9.93 9.37 9.35   O9Ib 71 0
13 Cl* Westerlund 1 W 86 * 16 46 57.1589551488 -45 50 09.938630292   22.9 18.76 16.43 14.00 O9.5Ib 12 0
14 Cl* Westerlund 1 W 373 s*b 16 46 57.7255119168 -45 53 20.035273668       14.741 12.318 B0Iab 13 0
15 Cl* Westerlund 1 W 228b * 16 46 58.0541909424 -45 53 00.932401356           O9Ib 12 0
16 Cl* Westerlund 1 W 55 s*b 16 46 58.4205093840 -45 51 31.294157724   21.6 18.030 15.283 12.758 B0Ia 19 0
17 [B2007] J164658.78-455431.9 V* 16 46 58.7770177032 -45 54 31.941132336     20.313 17.377 14.816 O9-9.5III 8 0
18 Cl* Westerlund 1 W 56b * 16 46 58.8667320511 -45 51 45.947165816   22.8 18.88 16.36 13.76 O9.5Ib 13 0
19 Cl* Westerlund 1 W 84 * 16 46 59.0490595608 -45 50 28.293859689   21.3 17.82 15.60 13.63 O9.5Ib 14 0
20 Cl* Westerlund 1 W 2 s*b 16 46 59.7175806088 -45 50 51.190946043   20.4 16.978 14.287 11.771 B2Ia 20 0
21 Cl* Westerlund 1 CN I WR* 16 47 00.8820136008 -45 51 20.517977916       17.336 14.340 WN8o 21 0
22 Cl* Westerlund 1 W 21 s*b 16 47 01.1124528826 -45 51 13.583454380   22.5 18.41 15.619 12.861 B0.5Ia 13 0
23 Cl* Westerlund 1 W 50b * 16 47 01.1722949256 -45 50 26.807447580   22.8 19.66 17.21 14.69 O9III 11 0
24 Cl* Westerlund 1 W 57 s*b 16 47 01.3600091808 -45 51 45.804003408   20.7 16.877 13.83 11.13 B4Ia 22 0
25 Cl* Westerlund 1 W 232 s*b 16 47 01.41 -45 52 34.9   21.3 17.53 14.98 12.45 B0Iab 9 0
26 Cl* Westerlund 1 BKS H s*y 16 47 01.4269856784 -45 50 37.248841536   18.781 14.47 11.80 9.15 F3Ia+ 31 0
27 Cl* Westerlund 1 W 78 s*b 16 47 01.5500127120 -45 49 57.922981500   21.0 17.413 14.621 12.04 B1Ia 14 0
28 WR 77d WR* 16 47 01.5976561900 -45 51 45.244547387           WN7o 16 0
29 [RCN2009] W3005 s*b 16 47 01.6814988264 -45 52 58.067536008       15.393 12.966 O9.5Iab 16 0
30 Cl* Westerlund 1 W 52 s*b 16 47 01.8449474352 -45 51 29.434394880   21.8 17.876 14.745 12.065 B1.5Ia 13 0
31 Cl* Westerlund 1 W 49 s*b 16 47 01.9027544712 -45 50 31.660433592   22.6 18.76 16.392 13.638 B0Iab 14 0
32 Cl* Westerlund 1 W 24 s*b 16 47 02.1561069816 -45 51 12.581922276   23.0 18.71 15.96 13.24 O9Iab 22 0
33 Cl* Westerlund 1 W 12 s*y 16 47 02.2214295629 -45 50 58.987616665   22.0 17.575 13.611 10.42 A5Ia+ 27 0
34 Cl* Westerlund 1 W 11 s*b 16 47 02.2390158456 -45 50 47.186514564   21.2 17.508 14.599 11.898 B2Ia 19 0
35 Cl* Westerlund 1 W 61a s*b 16 47 02.2999985640 -45 51 41.772039336   21.2 17.506 14.633 12.01 B0.5Ia 18 0
36 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
37 Cl* Westerlund 1 CN J WR* 16 47 02.4735872095 -45 50 59.898935502           WN5h 16 0
38 Cl* Westerlund 1 W 62a LP? 16 47 02.5204504462 -45 51 38.051924860           B0.5Ib 11 0
39 Cl* Westerlund 1 W 61b s*b 16 47 02.5662082776 -45 51 41.864431536   22.7 18.59 16.00 13.31 O9.5Iab 20 0
40 Cl* Westerlund 1 W 23a s*b 16 47 02.5776330614 -45 51 08.902293204   22.1 18.316 14.986 12.081 B2Ia+B:I? 20 0
41 Cl* Westerlund 1 W 41 s*b 16 47 02.7105467198 -45 50 56.972033345   21.3 17.87 15.39 12.78 O9Iab 18 0
42 Cl* Westerlund 1 W 38 s*b 16 47 02.8628531323 -45 50 46.145964246   23.2 19.10 16.47 13.81 O9Iab 14 0
43 Cl* Westerlund 1 W 6b * 16 47 02.9390384334 -45 50 22.480676456   23.6 20.20 17.91 15.25 O9.5III 10 0
44 WR 77f WR* 16 47 02.9772955944 -45 50 19.713734556   21.552 17.792 15.035 12.508 WNL/BIa+ 38 0
45 Cl* Westerlund 1 W 6a s*b 16 47 03.0477797919 -45 50 23.748131606   22.2 18.41 15.80 13.16 B0.5Iab 21 0
46 Cl* Westerlund 1 W 54 s*b 16 47 03.06 -45 51 30.5           B0.5Iab 8 0
47 Cl* Westerlund 1 W 237 s*r 16 47 03.1097130192 -45 52 18.960733164   22.8 19.008 13.634 9.19 M3I 32 0
48 WR 77g WR* 16 47 03.15 -45 50 43.8     19     WC8 17 0
49 Cl* Westerlund 1 W 42 s*b 16 47 03.2521856424 -45 50 52.195013052         10.764 B9Ia+ 21 0
50 Cl* Westerlund 1 W 10 s*b 16 47 03.3405625992 -45 50 34.603317456   22.720 18.516 15.257   O9.5/B0.5Iae 20 0
51 Cl* Westerlund 1 W 63a s*b 16 47 03.4010407564 -45 51 57.852956239   22.6 18.56 16.20 13.68 B0Iab 10 0
52 Cl* Westerlund 1 W 43b s*b 16 47 03.5274881368 -45 50 56.525344948           B1Ia 8 0
53 Cl* Westerlund 1 W 43a s*b 16 47 03.5568442836 -45 50 57.728053296   22.8 18.05 15.22 12.26 B0Ia 14 0
54 Cl* Westerlund 1 W 46b * 16 47 03.61 -45 51 20.0           O9.5Ib 8 0
55 Cl* Westerlund 1 W 7 s*b 16 47 03.6281794392 -45 50 14.365482036   20.0 15.972 12.73 9.99 B5Ia+ 31 0
56 Cl* Westerlund 1 BKS F s*y 16 47 03.6850109472 -45 50 43.536110712     15.05     F5Ia+ 23 0
57 Cl* Westerlund 1 W 43c * 16 47 03.7585229164 -45 50 58.441368189   20.4 18.35 16.18 13.66 O9Ib 12 0
58 Cl* Westerlund 1 CN V WR* 16 47 03.8075002560 -45 50 38.725374804           WN8o 16 0
59 Cl* Westerlund 1 W 65 * 16 47 03.8973039959 -45 51 46.495252717   22.9 18.73 16.27 13.68 O9Ib 13 0
60 Cl* Westerlund 1 W 46a s*b 16 47 03.9147803107 -45 51 19.743263385   23.0 18.55 15.537 12.499 B1Ia 18 0
61 Cl* Westerlund 1 CN G WR* 16 47 04.0152346631 -45 51 25.019757928   22.7 20.87 17.75 14.68 WN7o 24 0
62 Cl* Westerlund 1 W 30 ** 16 47 04.1126936513 -45 50 39.164057275   22.4 18.45 15.80 13.20 O4-5Ia+ 25 0
63 Cl* Westerlund 1 W 33 s*b 16 47 04.1256274968 -45 50 48.488202564   20.090 15.61 12.803 10.04 B5Ia+ 26 0
64 Cl* Westerlund 1 W 60 s*b 16 47 04.1335644720 -45 51 52.259535324   22.8 18.50 16.041 13.384 B0Iab 20 0
65 Cl* Westerlund 1 W 9 WR* 16 47 04.1419806984 -45 50 31.311670632   21.8 17.47 14.47 11.74 sgB[e] 56 0
66 Cl* Westerlund 1 W 35 s*b 16 47 04.2023052264 -45 50 53.727473868   22.7 18.59 16.00 13.31 O9Iab 16 0
67 WR 77k WR* 16 47 04.2072122904 -45 51 07.177760892   22.6 18.86 15.61 12.52 WN7 29 0
68 Cl* Westerlund 1 W 34 s*b 16 47 04.3941837044 -45 50 47.222852634   22.1 18.15 15.40 12.69 B0Ia 12 0
69 Cl* Westerlund 1 W 29 s*b 16 47 04.4118843432 -45 50 39.933732768   22.6 18.66 16.02 13.38 O9.5/B0.5Ia 14 0
70 Cl* Westerlund 1 W 238 s*b 16 47 04.4263582176 -45 52 27.788277972   21.4 17.820 14.98 12.45 B1Iab 18 0
71 Cl* Westerlund 1 W 28 s*b 16 47 04.6646286552 -45 50 38.503394520   20.9 17.146 14.303 11.64 B2Ia 17 0
72 Cl* Westerlund 1 W 20 s*r 16 47 04.6967287296 -45 51 23.953706496       15.660   M6I 28 0
73 Cl* Westerlund 1 W 8 s*y 16 47 04.7959778348 -45 50 25.013789709   19.9 15.913 12.64 9.89 F8Ia+ 23 0
74 Cl* Westerlund 1 W 19 s*b 16 47 04.8672458112 -45 50 59.295902136   22.6 18.784 15.366 12.452 B1Ia 19 0
75 Cl* Westerlund 1 W 8b s*b 16 47 04.95 -45 50 26.7           B1.5Ia 10 0
76 Cl* Westerlund 1 W 36 s*b 16 47 05.0826653568 -45 50 55.155662808   22.8 18.89 16.09 13.38 OBIa+OBIa 14 0
77 Cl* Westerlund 1 W 27 s*b 16 47 05.1550269480 -45 50 41.418677508   21.5 17.94 15.35 12.80 O9I+OI 14 0
78 Cl* Westerlund 1 CN B WR* 16 47 05.3717585660 -45 51 04.811705369     20.99 17.50 14.37 WN7o 32 0
79 2MASS J16470540-4550367 s*r 16 47 05.4076906176 -45 50 36.617071668   22.1 16.79 12.63 9.19 M2-5Ia 40 0
80 Cl* Westerlund 1 W 18 s*b 16 47 05.7082494087 -45 50 50.480383849   21.2 17.610 14.898 12.228 B0.5Ia 12 0
81 Cl* Westerlund 1 W 25 s*b 16 47 05.7882476736 -45 50 33.368306136   21.9 17.85 15.22 12.61 O9Iab 13 0
82 Cl* Westerlund 1 CN R WR* 16 47 05.9726730842 -45 50 23.072495547       17.652 15.223 WN5o 25 0
83 Cl* Westerlund 1 W 39a * 16 47.1 -45 51           ~ 3 0
84 Cl* Westerlund 1 W 37 * 16 47 06.0112607572 -45 50 47.478171168   22.8 19.11 16.40 13.65 O9Ib 9 0
85 Cl* Westerlund 1 CN E WR* 16 47 06.0667110144 -45 52 08.266249200     18.379 15.675 12.940 WC9 25 0
86 Cl* Westerlund 1 W 17 s*b 16 47 06.2490500592 -45 50 49.292687328   22.7 18.87 16.19 13.56 O9Iab 19 0
87 Cl* Westerlund 1 CN D WR* 16 47 06.2554455566 -45 51 26.391243810       18.935 15.600 WN7o 23 0
88 Cl* Westerlund 1 W 265 s*y 16 47 06.2785465416 -45 49 23.774098692   22.0 17.739 13.62 10.54 F1-5Ia+ 27 0
89 Cl* Westerlund 1 W 13 WR* 16 47 06.4540771320 -45 50 26.072579796   21.1 17.19 14.63 12.06 WNL/BIa+ 40 0
90 WR 77s WR* 16 47 06.5427725380 -45 50 39.068951194   23.7 19.81 16.98 13.99 WN6o 18 0
91 Cl* Westerlund 1 W 16 sg* 16 47 06.6158603112 -45 50 42.186706944   20.5 16.248 12.82 9.90 A5Ia+ 29 0
92 Cl* Westerlund 1 W 15 * 16 47 06.6306037464 -45 50 29.723762580   22.8 18.96 16.38 13.75 O9Ib 29 0
93 Cl* Westerlund 1 W 74 s*b 16 47 07.0783996992 -45 50 13.086504168       15.835 13.312 O9.5Iab 17 0
94 Cl* Westerlund 1 W 243 s*b 16 47 07.5040736160 -45 52 29.123491188   19.873 15.730     LBV 67 0
95 WR 77sa WR* 16 47 07.6203489360 -45 49 22.068668640           WN6h 15 0
96 Cl* Westerlund 1 CN O WR* 16 47 07.6630825488 -45 52 35.964833052       16.886 14.047 WN6o 18 0
97 WR 77sc WR* 16 47 08.3538521592 -45 50 45.414739212     19.69 16.59 13.68 WN7b 32 0
98 Cl* Westerlund 1 W 71 s*b 16 47 08.4584673360 -45 50 49.338181284   21.5 17.531 14.158 11.16 B2.5Ia 24 0
99 2MASS J16470892-4549585 s*r 16 47 08.9198319768 -45 49 58.452357324     16.70     M4Ia 29 0
100 Cl* Westerlund 1 W 70 s*b 16 47 09.3836656992 -45 50 49.668960804   21.2 16.88 14.10 11.352 B3Ia 19 0
101 [RCN2009] W3003 V* 16 47 11.6073210840 -45 49 22.478619972   23.1 19.08 16.211 13.314 B0Ib 16 0
102 [RCN2009] W3004 s*b 16 47 13.3832726280 -45 49 10.636397724   23.2 18.93 15.960 12.990 B0Iab 12 0
103 WR 77sd WR* 16 47 14.1461547746 -45 48 31.963132544           WN5o 13 0
104 HD 151804 s*b 16 51 33.7218052272 -41 13 49.919519496 4.45 5.29 5.22     O8Iaf 389 0
105 HD 153159 * 17 00 02.7951950352 -47 04 00.941523780 10.38 10.33 9.58 9.29   B5Ib 26 0
106 Cl VDBH 222 OpC 17 18 46.6 -38 17 20           ~ 31 0
107 HD 160529 s*b 17 41 59.0261939376 -33 30 13.704456780 8.17 7.87 6.66 5.50 4.51 B8-A9Ia+ 203 1
108 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
109 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
110 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
111 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Ia+ 196 1
112 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B8Ia+ 293 2
113 HD 169054 * 18 24 59.6667480768 -44 41 24.774014292   10.24 9.68     G5/K0+A/F 5 0
114 RSGC 1 OpC 18 37 58 -06 53.0           ~ 117 0
115 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 102 0
116 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 58 0
117 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
118 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 453 0
119 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 243 0
120 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
121 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 153 0
122 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 253 0
123 BD+41 3807 SB* 20 34 08.5147948176 +41 36 59.408503092 11.74 11.52 10.03     O5.5Ifc 137 0
124 * pi. Aqr Be* 22 25 16.6230017410 +01 22 38.634449478 3.64 4.60 4.64 4.48 4.48 B1III-IVe 436 0
125 NAME Galactic Bulge reg ~ ~           ~ 4794 0
126 NAME Local Group GrG ~ ~           ~ 9325 0

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