2010MNRAS.403.1577M

Query : 2010MNRAS.403.1577M

2010MNRAS.403.1577M - Mon. Not. R. Astron. Soc., 403, 1577-1591 (2010/April-2)

Polarization towards the young open cluster NGC 6823.

MEDHI B.J., MAHESWAR G., PANDEY J.C., TAMURA M. and SAGAR R.

Abstract (from CDS):

We present multiwavelength linear polarimetric observations of 104 stars towards the region of young open cluster NGC 6823. The polarization towards NGC 6823 is dominated by foreground dust grains and we found evidence for the presence of several layers of dust towards the line of sight. The first layer of dust is approximately located within 200pc towards the cluster, which is much closer to the Sun than the cluster itself (∼2.1kpc). The radial distribution of the position angles for the member stars is found to show a systematic change, while the polarization is found to reduce towards the outer parts of the cluster and the average position angle of the coronal region of the cluster is very close to the inclination of the Galactic parallel (∼32°). The size distribution of the grains within NGC 6823 is similar to those in the general interstellar medium. The patchy distribution of foreground dust grains is suggested to be mainly responsible for both differential reddening and polarization towards NGC 6823. The majority of the observed stars do not show evidence of intrinsic polarization in their light.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): polarization - dust, extinction - open clusters and associations: individual: NGC 6823

VizieR on-line data: <Available at CDS (J/MNRAS/403/1577): table2.dat table4.dat>

Nomenclature: Tables 2, 4: [MMP2010] NNN (Nos 1-104).

Simbad objects: 122

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Number of rows : 122
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 TGU H774 P18 DNe 00 00.7 +67 31           ~ 2 0
2 BD+64 106 ** 00 57 36.6894556320 +64 51 34.907455548 10.82 11.01   10.21   B1V 77 0
3 NGC 654 OpC 01 44 01.5 +61 53 06   7.34 6.5     ~ 206 0
4 HD 12021 * 01 57 56.1374259408 -02 05 57.712014564   8.79 8.85     B8V 41 0
5 HD 14069 * 02 16 45.1936420248 +07 41 10.637150532   9.21 9.06     A0 61 0
6 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
7 V* CC Cas SB* 03 14 05.3361655368 +59 33 48.485582712 7.07 7.56 7.08     O8.5III(n)((f)) 308 0
8 HD 21447 * 03 30 00.1828170168 +55 27 06.506069256 5.160 5.140 5.090 5.01 5.02 A1Va 147 0
9 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
10 NAME Vul Rift MoC 19 36 53 +23 04.7           ~ 27 0
11 NGC 6823 178 * 19 42 25.6913948640 +23 16 15.261595716   14.23 13.5     ~ 5 0
12 NGC 6820 GNe 19 42 27.930 +23 05 14.75       14.56   ~ 50 0
13 NGC 6823 177 * 19 42 28.1013902448 +23 16 17.839946712   13.75 13.0     ~ 5 0
14 HD 344789 * 19 42 29.1583236720 +23 13 50.580764544   11.05 10.63     A3 10 0
15 [MMP2010] 86 * 19 42 31.16 +23 15 00.4           ~ 1 0
16 [MMP2010] 87 * 19 42 32.97 +23 17 33.5           ~ 1 0
17 NGC 6823 176 * 19 42 35.0481635808 +23 16 26.543346456   15.21 13.5     ~ 11 0
18 2MASS J19423640+2311226 * 19 42 36.4015597152 +23 11 22.582795812   15.46 15.26     ~ 2 0
19 2MASS J19423884+2313428 * 19 42 38.8485686136 +23 13 42.757017240   15.61 15.05     ~ 4 0
20 2MASS J19424040+2314369 * 19 42 40.4047050816 +23 14 36.998963628   16.09 15.65     ~ 2 0
21 2MASS J19424063+2311168 * 19 42 40.6360255176 +23 11 16.934729856   14.8 14.40     ~ 2 0
22 NGC 6823 184 EB* 19 42 41.3653566864 +23 14 40.191313200   13.85 13.2     ~ 5 0
23 NGC 6823 179 * 19 42 42.2231425080 +23 16 56.460442620   14.20 12.50     K5 7 0
24 NGC 6823 180 * 19 42 42.7339750320 +23 16 39.330882264   13.72 12.2     ~ 4 0
25 NGC 6823 191 * 19 42 45.1093017388 +23 13 16.161417236   13.981 13.481 13.285   ~ 4 0
26 [MMP2010] 97 * 19 42 45.58 +23 14 15.0           ~ 1 0
27 NGC 6823 185 * 19 42 46.1021804328 +23 15 01.223034336   14.21 13.52     ~ 3 0
28 NGC 6823 192 * 19 42 50.0611331088 +23 12 45.110888064   14.73 14.11     ~ 3 0
29 NGC 6823 22 * 19 42 50.1375461304 +23 18 24.335870904   14.63 14.15     ~ 4 0
30 NGC 6823 186 RS* 19 42 50.1931789680 +23 15 39.122517420   14.33 13.80     ~ 10 0
31 [MMP2010] 1 * 19 42 51.00 +23 18 42.2           ~ 1 0
32 NGC 6823 20 * 19 42 54.6819368746 +23 18 57.923586897   13.50 12.87 12.764   B3 11 0
33 NGC 6823 23 * 19 42 55.1409075720 +23 16 20.455969512       14.064   ~ 7 0
34 NGC 6823 187 * 19 42 56.3934367920 +23 13 37.664526900   14.14 13.5     B4V 9 0
35 HD 344788 PM* 19 42 57.6226232784 +23 11 34.553394888   9.44 8.83     G2V 29 0
36 NGC 6823 74 * 19 42 58.3389806736 +23 20 15.693548028 11.72 11.87 11.48 11.562   B2III 28 0
37 NGC 6823 18 * 19 42 59.5844316192 +23 17 46.803546867       13.868   ~ 9 0
38 NGC 6823 28 * 19 43 01.4067672864 +23 14 40.650798624   15.05 14.35     ~ 4 0
39 HD 344781 PM* 19 43 01.6107994272 +23 20 36.288073140   10.26 9.47 9.382   K0 15 0
40 NGC 6823 17 * 19 43 01.9071588624 +23 17 30.756439680 12.24 12.72 12.01 12.016   B2:V 29 0
41 NGC 6823 25 * 19 43 01.9143949152 +23 15 48.468346560   14.25 13.63     ~ 8 0
42 NGC 6823 24 * 19 43 02.0484994320 +23 16 13.040292036   15.09 14.50     ~ 5 0
43 NGC 6823 29 * 19 43 02.0588117723 +23 14 29.371599246   14.64 14.14     ~ 6 0
44 [MMP2010] 9 * 19 43 02.06 +23 15 37.4           ~ 1 0
45 NGC 6823 78 * 19 43 02.7027996672 +23 18 23.749606692 12.32 12.33 11.56 12.089   B5:V 25 0
46 NGC 6823 27 * 19 43 02.7867325176 +23 14 48.763019760   14.52 13.4     ~ 5 0
47 NGC 6823 77 Y*O 19 43 04.3989294028 +23 18 48.641498776       13.638   ~ 16 0
48 NGC 6823 26 * 19 43 04.3999406472 +23 14 48.184722132   12.89 12.43     K0III 9 0
49 [D75b] Em* 19-004 Em* 19 43 04.9147060608 +23 19 49.252629828       12.887   G8II-III 11 0
50 NGC 6823 79 * 19 43 04.9577536560 +23 22 52.908240900   14.40 13.72     ~ 6 0
51 NGC 6823 99 * 19 43 04.96 +23 24 17.6   15.56 14.59     ~ 3 0
52 NGC 6823 76 * 19 43 05.1277602528 +23 19 36.611052852       13.122   G5V 8 0
53 Cl* NGC 6823 BL 45 * 19 43 05.1969080136 +23 17 09.130001820   14.61 14.41     ~ 7 0
54 NGC 6823 80 * 19 43 05.3537411544 +23 23 10.498258572   13.61 13.0     B5 8 0
55 NGC 6823 98 * 19 43 05.3837177784 +23 24 31.344751476   14.20 13.3     F2III-IV 6 0
56 NGC 6823 16 * 19 43 05.9640768481 +23 17 32.883235808       13.786   ~ 8 0
57 HD 344783 Be* 19 43 06.7883997960 +23 16 12.395020404 12.28 10.16 9.85 9.770   O9.7III 61 0
58 NGC 6823 14 * 19 43 07.1131688472 +23 16 35.270044464 12.39 12.55 12.04     B2:V 16 0
59 2MASS J19430909+2323410 * 19 43 09.0972812592 +23 23 41.026953120   14.68 14.28     ~ 2 0
60 NGC 6823 12 * 19 43 09.5360355624 +23 16 35.003700048   14.75 13.97     ~ 9 0
61 NGC 6823 71 * 19 43 10.2691565760 +23 20 49.395662592       13.440   F9V 9 0
62 NGC 6823 70 * 19 43 10.9289717280 +23 20 20.798827620       14.028   ~ 6 0
63 HD 344784 * 19 43 10.9730324664 +23 17 45.364272000 9.38 9.86 9.37 9.378   O6.5V((f)) 100 0
64 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
65 2MASS J19431187+2324500 * 19 43 11.8705442280 +23 24 49.957652160   15.2 15.13     ~ 2 0
66 NGC 6823 10 * 19 43 12.0486920736 +23 16 09.637818564       14.216   ~ 10 0
67 NGC 6823 11 * 19 43 12.4680026760 +23 16 29.269807176 12.04     11.403   B0.5V 25 0
68 2MASS J19431291+2323318 * 19 43 12.9148044432 +23 23 31.751080476   15.5 15.09     ~ 2 0
69 NGC 6823 81 * 19 43 13.3413041856 +23 22 11.136032292   13.86 13.1     B7 10 0
70 NGC 6823 68 * 19 43 13.5412176792 +23 19 05.719586988 12.28     11.717   O9V 21 0
71 NGC 6823 4 SB* 19 43 14.2949633856 +23 17 17.949274368   11.87 11.66 11.41   F8III 13 0
72 Cl* NGC 6823 HOAG 154 * 19 43 14.5175792328 +23 20 16.403990316   15.33 14.50     ~ 4 0
73 NGC 6823 9 EB* 19 43 14.6198366640 +23 16 01.426061820 12.27 12.01 11.81 11.610   B1.5V 27 0
74 [MJD95] J194314.74+230959.2 * 19 43 14.72 +23 09 59.2   16.08 15.90     ~ 2 0
75 NGC 6823 8 * 19 43 15.4776205680 +23 16 40.143719316       13.574   ~ 7 0
76 NGC 6823 33 * 19 43 16.0067389200 +23 13 22.410095052   12.88 12.27 12.66   F5 12 0
77 NGC 6823 36 * 19 43 16.2110583336 +23 11 31.006557096   14.46 13.46     ~ 4 0
78 NGC 6823 5 HB* 19 43 16.6451167776 +23 17 44.001343968       12.778   B8 21 0
79 NGC 6823 65a * 19 43 16.8927075432 +23 17 26.434898952       13.879   ~ 5 0
80 Cl* NGC 6823 HOAG 28 * 19 43 16.9268196336 +23 16 08.770663164       14.562   ~ 7 0
81 NGC 6823 64a * 19 43 17.0062162392 +23 19 49.020148128   12.84 12.4     G0V 7 0
82 NGC 6823 82 * 19 43 17.2178457288 +23 22 11.332044696   12.46 12.04 12.02   F2IV 10 0
83 NGC 6823 65 * 19 43 18.9039968376 +23 18 45.072825480       13.428   B2 15 0
84 NGC 6823 125 * 19 43 20.0165782272 +23 25 41.901912552   14.53 14.57     ~ 3 0
85 NGC 6823 64 Or* 19 43 20.2602166848 +23 19 20.459226828       12.94   ~ 10 0
86 2MASS J19432159+2324068 * 19 43 21.5961981096 +23 24 06.827419656   14.81 14.44     ~ 2 0
87 NGC 6823 61 * 19 43 21.8046225672 +23 17 33.204446628       13.321   F4V 11 0
88 NGC 6823 62 * 19 43 22.4976363504 +23 18 25.179272892   14.33 12.95     G8 12 0
89 2MASS J19432291+2315143 * 19 43 22.9128260640 +23 15 14.281174728   15.13 14.69     ~ 2 0
90 NGC 6823 63 * 19 43 23.0230853064 +23 18 10.602033840   14.20 14.06     ~ 5 0
91 LS II +23 28 * 19 43 23.0561446728 +23 12 38.884775220 12.31 12.24 11.52 11.59   B 29 0
92 G 185-35 PM* 19 43 23.3263846392 +23 23 27.509744112       10.6   K7 21 0
93 NGC 6823 96 * 19 43 24.0072414528 +23 23 18.678228828   14.75 13.85     ~ 3 0
94 2MASS J19432454+2321138 * 19 43 24.5424282672 +23 21 13.781902320   13.69 13.40     ~ 2 0
95 2MASS J19432480+2326140 * 19 43 24.7966102800 +23 26 14.118015156   15 14.75     ~ 2 0
96 [MMP2010] 66 * 19 43 26.27 +23 20 33.3           ~ 1 0
97 2MASS J19432638+2326189 * 19 43 26.39 +23 26 18.9   16.16 15.28     ~ 2 0
98 NGC 6823 88 * 19 43 28.1401313208 +23 21 12.061470600   13.79 12.5     G0 7 0
99 2MASS J19432831+2324329 AB? 19 43 28.3179765480 +23 24 32.917380516   14.63 13.77     ~ 8 0
100 NGC 6823 51 * 19 43 28.7113290216 +23 14 38.440608468   14.36 13.74     ~ 5 0
101 HD 344787 cC* 19 43 29.3862278448 +23 10 40.634309964   10.33 9.32     K0 37 0
102 NGC 6823 129 * 19 43 29.7734055720 +23 25 09.635345544   14.13 13.5     ~ 5 0
103 NGC 6823 128 * 19 43 30.0887962346 +23 24 32.998436761   15.00 13.66     ~ 6 0
104 [MMP2010] 68 * 19 43 30.17 +23 21 19.4           ~ 1 0
105 NGC 6823 130 * 19 43 30.6290124480 +23 25 28.268411916   14.41 13.6     ~ 4 0
106 NGC 6823 95 * 19 43 31.3263213133 +23 23 07.329507807       12.730   A7III/IV 7 0
107 NGC 6823 86 * 19 43 31.4411674563 +23 20 40.189193600       12.983   ~ 4 0
108 LS II +23 29 * 19 43 32.4954982032 +23 22 10.105929696 10.49 11.11 10.75     B1.5III 22 0
109 NGC 6823 53 * 19 43 32.5051379208 +23 15 03.268976112   14.41 13.74     ~ 4 0
110 NGC 6823 94 Pu* 19 43 32.9831361552 +23 22 40.169019288   13.67 13.1     B3V 11 0
111 [MJD95] J194333.49+231001.4 * 19 43 33.47 +23 10 01.2   14.59 14.36     ~ 2 0
112 LS II +23 31 * 19 43 36.6022835544 +23 21 07.607576808 11 11.41 10.90     B1V 15 0
113 NGC 6823 50 * 19 43 37.7245269264 +23 14 02.275654956   12.02 11.43     ~ 7 0
114 NGC 6823 49 * 19 43 38.9122059576 +23 14 06.876061548   14.56 13.2     ~ 5 0
115 2MASS J19434015+2325402 * 19 43 40.1510642736 +23 25 40.264399740   15.9 14.57     ~ 2 0
116 2MASS J19434103+2324434 * 19 43 41.0385996528 +23 24 43.444087992   14.07 14.07     ~ 5 0
117 BD+22 3788 * 19 43 41.9250883368 +23 16 10.561470384   10.69 10.24 10.222   F1V 13 0
118 [MJD95] J194342.55+232442.9 * 19 43 42.5325153282 +23 24 42.253197851   15.58 15.07     ~ 4 0
119 NGC 6823 42 * 19 43 44.1496000320 +23 11 11.805188280   13.16 11.9     K3 8 0
120 LDN 791 DNe 19 49.6 +23 58           ~ 4 0
121 BD+38 4058 EB* 20 23 28.5314538120 +39 20 59.037427788 12.02 11.81 10.62     B0V 69 0
122 HD 204827 SB* 21 28 57.7592315784 +58 44 23.238427956 8.63 8.74 7.94 7.25 6.76 O9.5IV 372 0

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