2020AJ....160..256S

Query : 2020AJ....160..256S

2020AJ....160..256S - Astron. J., 160, 256-256 (2020/December-0)

Broadband linear polarization in the region of the open star cluster NGC 1817.

SINGH S. and PANDEY J.C.

Abstract (from CDS):

Multiband linear polarimetric observations of 125 stars in the region of the cluster NGC 1817 have been carried out intending to study properties of interstellar dust and grains in that direction. The polarization is found to be wavelength-dependent, being maximum in the V band with an average value of 0.95%. The foreground interstellar dust grains appear to be the main source of linear polarization of starlight toward the direction of NGC 1817. The average value of the position angle in the V band of 119.°2 is found to be less than the direction of the Galactic parallel in the region, indicating that the dust grains in the direction are probably not yet relaxed. Spatial distribution of dust appears to be more diverse in the coronal region than the core region of the cluster. The maximum value of the degree of polarization is estimated to be 0.93% for members of the cluster using the Serkowski relation. The average value of wavelength corresponding to the maximum polarization of 0.54 ± 0.02 µm indicates that the size distribution of dust grains in the line of sight is similar to that of the general interstellar medium. Several variable stars in the cluster were also observed polarimetrically and pulsating variables appear to have a slightly lower value of polarization from other nonvariable member stars of the cluster. There are indications of the existence of dust layers in front of those clusters which are located close to galactic plane while for clusters located away from galactic plane no major dust layers are observed.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Starlight polarization - Polarimeters - Open star clusters - Interstellar dust - Interstellar dust extinction - Interstellar medium

VizieR on-line data: <Available at CDS (J/AJ/160/256): table1.dat table3.dat>

Simbad objects: 134

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Number of rows : 134
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 Cl Berkeley 59 OpC 00 02 17 +67 26.5           ~ 107 0
2 Cl Alessi 1 OpC 00 53 31.9 +49 32 18           ~ 62 0
3 NGC 654 OpC 01 44 01.5 +61 53 06   7.34 6.5     ~ 206 0
4 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
5 HD 21447 * 03 30 00.1828170168 +55 27 06.506069256 5.160 5.140 5.090 5.01 5.02 A1Va 147 0
6 HD 25443 * 04 06 08.0655259656 +62 06 06.607649268 6.45 6.998 6.766     B0.5III 155 0
7 Cl* NGC 1817 BJG 722 Pe* 05 11 36.9267993288 +16 42 33.677050572     14.484     kA3hA8mF0Sr 7 0
8 2MASS J05113782+1639570 * 05 11 37.8279479136 +16 39 57.111547068     13.454     ~ 4 0
9 Cl* NGC 1817 MMU 1135 HB* 05 11 39.3156595528 +16 40 09.391124814   13.62 12.404     ~ 19 0
10 2MASS J05114007+1644010 * 05 11 40.0745512272 +16 44 01.114743228     14.402     ~ 3 0
11 PM2000 223523 * 05 11 41.6781239112 +16 34 25.219479360     14.605     ~ 3 0
12 Cl* NGC 1817 BJG 723 * 05 11 43.2203863512 +16 42 39.439531620   11.60 11.299     ~ 9 0
13 Cl* NGC 1817 BJG 582 * 05 11 45.2500273968 +16 45 21.554846964     14.894     ~ 5 0
14 2MASS J05114537+1634490 * 05 11 45.3740370912 +16 34 49.099269360     14.771     ~ 7 0
15 2MASS J05114552+1642548 * 05 11 45.5325507072 +16 42 54.927887580     14.956     ~ 3 0
16 NGC 1817 267 * 05 11 45.6506767008 +16 32 49.347707568     13.744     ~ 7 0
17 NGC 1817 266 * 05 11 47.9549923152 +16 33 05.689441620     13.581     ~ 7 0
18 2MASS J05114803+1634568 * 05 11 48.0320832192 +16 34 56.902742580     14.679     ~ 3 0
19 2MASS J05114847+1636598 * 05 11 48.4732283568 +16 36 59.869987380     14.119     ~ 8 0
20 NGC 1817 245 * 05 11 48.5543743482 +16 41 09.923302014     15.203     ~ 13 0
21 NGC 1817 270 * 05 11 48.7166197560 +16 33 48.004588728     12.515     ~ 8 0
22 NGC 1817 243 * 05 11 49.9320469920 +16 40 16.412511504     14.443     ~ 12 0
23 NGC 1817 272 * 05 11 49.9645312200 +16 35 07.362406176     13.503     ~ 11 0
24 NGC 1817 265 * 05 11 50.2443235056 +16 32 54.691479600   14.23 12.903     ~ 6 0
25 NGC 1817 269 * 05 11 50.8710164856 +16 34 15.767523696   13.68 12.293     ~ 10 0
26 NGC 1817 240 EB? 05 11 51.0200106768 +16 37 57.162239112   13.20 12.405     ~ 11 0
27 NGC 1817 280 * 05 11 51.1389130464 +16 46 08.772400488     13.130     ~ 11 0
28 NGC 1817 244 HB* 05 11 51.9333525644 +16 40 45.674585766   13.63 12.490     ~ 25 0
29 PM2000 223881 * 05 11 53.4459257664 +16 39 44.892107532     14.534     ~ 3 0
30 2MASS J05115348+1636362 * 05 11 53.4921598992 +16 36 36.304113312     15.180     ~ 8 0
31 NGC 1817 261 * 05 11 55.6827428016 +16 34 12.610302132   12.47 12.407     ~ 8 0
32 NGC 1817 249 * 05 11 57.4156224720 +16 44 32.512465536     13.887     ~ 12 0
33 NGC 1817 260 * 05 11 59.3257721880 +16 33 47.801789388     13.578     ~ 7 0
34 NGC 1817 173 * 05 11 59.5423274688 +16 42 44.526556080     13.346     ~ 11 0
35 2MASS J05120035+1637507 * 05 12 00.3655089309 +16 37 50.739372463     14.950     ~ 8 0
36 NGC 1817 231 * 05 12 01.2844284480 +16 35 06.974965068     13.555     ~ 12 0
37 NGC 1817 172 * 05 12 02.8167548328 +16 42 28.482286500     13.788     ~ 12 0
38 2MASS J05120380+1633057 * 05 12 03.8074482816 +16 33 05.758066584     15.407     ~ 5 0
39 NGC 1817 90 * 05 12 04.5868057752 +16 40 26.801336352   13.59 12.204     ~ 16 0
40 NGC 1817 177 HB* 05 12 06.5166674678 +16 44 44.615491070   13.55 12.322     ~ 21 0
41 PM2000 224343 * 05 12 06.5705607120 +16 50 30.248753532     14.544     ~ 3 0
42 NGC 1817 82 * 05 12 06.8855207640 +16 38 31.229628828   13.03 12.566     ~ 13 0
43 PM2000 224371 * 05 12 07.2371468736 +16 43 26.952726180     14.234     ~ 3 0
44 PM2000 224399 * 05 12 08.0525805024 +16 46 06.033035244     14.770     ~ 3 0
45 2MASS J05120886+1647130 * 05 12 08.8669754328 +16 47 13.110146772     14.539     ~ 7 0
46 NGC 1817 84 * 05 12 09.2482179432 +16 39 26.986736916   13.27 12.753     ~ 12 0
47 2MASS J05120966+1642432 * 05 12 09.6661445400 +16 42 43.280706168     15.330     ~ 3 0
48 PM2000 224472 * 05 12 10.4760601344 +16 34 44.833380312     13.432     ~ 3 0
49 NGC 1817 79 HB* 05 12 10.6739122296 +16 38 31.112306268   13.54 12.443     ~ 33 0
50 NGC 1817 101 * 05 12 11.8103407272 +16 44 31.143709788     13.207     ~ 12 0
51 2MASS J05121193+1635038 * 05 12 11.9293461168 +16 35 03.798345552     15.294     ~ 7 0
52 PM2000 224541 * 05 12 12.4385518800 +16 46 12.021333312     15.539     ~ 3 0
53 NGC 1817 180 EB* 05 12 12.5321057592 +16 47 20.009934816     13.083     ~ 13 0
54 NGC 1817 50 * 05 12 13.6439328714 +16 42 35.920516384     14.414     ~ 14 0
55 2MASS J05121530+1641594 * 05 12 15.2975818911 +16 41 59.504011124     14.963     ~ 9 0
56 2MASS J05121624+1651132 * 05 12 16.2513273192 +16 51 13.254809040     15.630     ~ 2 0
57 2MASS J05121635+1632278 Pu* 05 12 16.3538685744 +16 32 27.867599916     14.977     ~ 11 0
58 PM2000 224666 * 05 12 16.4013566664 +16 48 13.466229804     14.345     ~ 3 0
59 NGC 1817 256 * 05 12 16.4269265136 +16 48 23.429432484     15.286     ~ 11 0
60 PM2000 224676 * 05 12 16.5165899376 +16 37 07.550239548     15.232     ~ 3 0
61 NGC 1817 47 Pe* 05 12 16.6142681590 +16 41 03.056683768     13.883     kA3hA5mA7 15 0
62 NGC 1817 158 * 05 12 16.7688723456 +16 34 45.334275960     12.888     ~ 8 0
63 NGC 1817 51 * 05 12 17.0514110520 +16 43 16.089702924     13.617     ~ 11 0
64 NGC 1817 44 HB* 05 12 17.5605491088 +16 38 44.092900032   12.51 11.068     ~ 24 0
65 NGC 1817 183 V* 05 12 17.6340540159 +16 47 38.679038990     14.502     ~ 14 0
66 NGC 1817 102 * 05 12 17.6965667424 +16 45 23.650755876     12.791     ~ 10 0
67 NGC 1817 52 * 05 12 17.7901362264 +16 43 46.914412044     14.088     ~ 11 0
68 PM2000 224719 * 05 12 17.7907406088 +16 48 51.511182192     14.770     ~ 3 0
69 NGC 1817 258 * 05 12 17.9590272528 +16 49 47.725655340     13.324     ~ 8 0
70 NGC 1817 12 HB* 05 12 18.5293247280 +16 41 45.554521344   13.62 12.564     ~ 21 0
71 NGC 1817 181 dS* 05 12 19.0990132560 +16 46 31.213347492     13.124     ~ 13 0
72 NGC 1817 43 dS* 05 12 19.1364179280 +16 38 34.376490420     13.194     ~ 13 0
73 NGC 1817 8 HB* 05 12 19.3874697192 +16 40 48.680441652   13.20 12.052     ~ 29 0
74 NGC 1817 5 dS* 05 12 19.7162950416 +16 40 15.672652644   14.28 13.894     ~ 14 0
75 Cl* NGC 1817 HH 3001 BS? 05 12 19.9024904016 +16 47 01.277081304     13.890     ~ 11 0
76 NGC 1817 75 * 05 12 20.7525761136 +16 36 38.688020100     13.238     ~ 8 0
77 NGC 1817 7 dS* 05 12 22.2450874200 +16 40 47.541080532     12.916     ~ 12 0
78 NGC 1817 53 * 05 12 22.5415625520 +16 43 59.447163576     13.226     ~ 10 0
79 NGC 1817 40 HB* 05 12 22.5849093982 +16 38 08.616795459   13.75 12.729     ~ 21 0
80 NGC 1817 155 * 05 12 23.0446345440 +16 34 00.904779984   13.885 12.448     ~ 15 0
81 PM2000 224911 * 05 12 23.2490075064 +16 46 45.495169248     15.696     ~ 3 0
82 PM2000 224917 * 05 12 23.4525189480 +16 46 24.148258896     15.900     ~ 3 0
83 NGC 1817 259 EB* 05 12 23.5535741328 +16 48 56.518693236     13.664     A1IVSrSi 14 0
84 NGC 1817 184 dS* 05 12 23.8378864992 +16 48 26.961177456     14.040     ~ 12 0
85 NGC 1817 103 * 05 12 23.9592243768 +16 45 10.129813020   13.845 12.581     ~ 15 0
86 NGC 1817 39 * 05 12 23.9887753224 +16 37 34.647777120     14.471     ~ 12 0
87 NGC 1817 55 dS* 05 12 24.6011178696 +16 43 32.428555536   13.72 13.233     ~ 16 0
88 2MASS J05122465+1635488 AB? 05 12 24.6514051896 +16 35 48.865173360   13.12 12.057     ~ 36 0
89 NGC 1817 13 * 05 12 25.1485199904 +16 41 44.992498308     12.283     ~ 13 0
90 NGC 1817 104 * 05 12 25.9963448640 +16 47 48.806189088     14.302     ~ 7 0
91 NGC 1817 72 RB? 05 12 26.2156988472 +16 35 55.668883020   13.21 12.089     ~ 18 0
92 V* V1177 Tau dS* 05 12 26.6748914184 +16 43 53.786577792   14.53 14.147     ~ 17 0
93 NGC 1817 226 * 05 12 26.9800009392 +16 32 42.668064096     13.331     ~ 6 0
94 2MASS J05122711+1634175 * 05 12 27.1097341632 +16 34 17.496758604     14.464     ~ 3 0
95 NGC 1817 4 gD* 05 12 27.8658820584 +16 40 06.192375564   15.20 14.751     ~ 13 0
96 PM2000 225099 * 05 12 28.2242997048 +16 44 02.315956740     14.604     ~ 3 0
97 NGC 1817 71 HB* 05 12 29.3226398160 +16 35 54.865806684   13.86 12.889     ~ 24 0
98 NGC 1817 2 * 05 12 29.8680749448 +16 41 57.302877264     13.768     ~ 12 0
99 2MASS J05123016+1647509 * 05 12 30.1615529304 +16 47 50.916754932     14.920     ~ 3 0
100 2MASS J05123025+1638284 * 05 12 30.2563201440 +16 38 28.404300984     13.656     ~ 4 0
101 NGC 1817 3 dS* 05 12 30.3664516008 +16 41 28.507777980   14.77 14.266     ~ 17 0
102 NGC 1817 185 HB* 05 12 31.0047029993 +16 49 25.237039775   13.97 12.799     ~ 17 0
103 NGC 1817 106 * 05 12 31.2481771536 +16 47 29.038040304     14.221     ~ 10 0
104 V* V1178 Tau dS* 05 12 32.2736280168 +16 44 51.832635612   13.05 12.581     ~ 20 0
105 NGC 1817 31 dS* 05 12 32.3230545888 +16 39 37.198946736     13.328     ~ 12 0
106 NGC 1817 30 HB* 05 12 32.5559684400 +16 39 57.656024280   13.5 12.438     ~ 22 0
107 NGC 1817 150 * 05 12 32.7969323520 +16 34 50.309270688     14.221     ~ 12 0
108 NGC 1817 25 dS* 05 12 33.0793220458 +16 41 50.312368073   13.4 12.931     ~ 17 0
109 PM2000 225259 * 05 12 33.1166599992 +16 50 23.879979564     15.206     ~ 3 0
110 NGC 1817 17 dS* 05 12 33.7070742072 +16 43 22.048241376   14.83 14.372     ~ 16 0
111 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
112 NGC 1817 18 * 05 12 34.1961265344 +16 43 39.815085612     14.015     ~ 9 0
113 NGC 1817 222 * 05 12 34.6645367736 +16 33 41.252383476     14.144     ~ 8 0
114 NGC 1817 20 * 05 12 35.3851462416 +16 42 46.575774828     12.861     ~ 8 0
115 Cl* NGC 1817 HH 2072 BS? 05 12 35.6176805496 +16 38 13.930944648   12.45 12.169     ~ 14 0
116 NGC 1817 19 HB* 05 12 35.9647699440 +16 43 28.212735504   13.26 12.186     ~ 21 0
117 PM2000 225400 * 05 12 37.1644610976 +16 35 44.274159204     14.156     ~ 3 0
118 NGC 1817 63 * 05 12 37.5441686064 +16 43 47.124613452   11.84 11.688     ~ 10 0
119 NGC 1817 22 HB* 05 12 38.4362882760 +16 42 23.181651864   13.43 12.292     ~ 20 0
120 NGC 1817 28 Pu* 05 12 39.0130476888 +16 41 04.474758624     12.775     ~ 15 0
121 V* V1181 Tau dS* 05 12 40.8119065992 +16 42 00.324841356   13.30 12.846     ~ 17 0
122 NGC 1817 27 * 05 12 41.0571913248 +16 41 44.918830320     13.098     ~ 10 0
123 2MASS J05124108+1639222 * 05 12 41.0823495426 +16 39 22.300198767     15.127     ~ 8 0
124 V* V1182 Tau dS* 05 12 42.8257330056 +16 41 43.278478404   13.92 13.507     ~ 18 0
125 NGC 1817 138 * 05 12 44.0175222336 +16 37 11.802256392   13.98 12.617     ~ 10 0
126 2MASS J05124501+1637440 Y*? 05 12 45.0170135208 +16 37 44.006389140     13.375     ~ 10 0
127 NGC 1817 142 Pu* 05 12 45.2251769088 +16 35 16.214060436     13.100     ~ 11 0
128 NGC 1817 64 HB* 05 12 45.3607738272 +16 43 41.116493712   13.25 12.060     ~ 17 0
129 NGC 1817 67 gD* 05 12 46.0465417392 +16 41 32.710591320     14.787     ~ 9 0
130 NGC 1817 122 * 05 12 46.5902828520 +16 43 44.730326028     13.615     ~ 7 0
131 NGC 1817 121 HB* 05 12 49.9915309392 +16 44 00.019769244   13.77 12.675     ~ 15 0
132 NGC 1817 127 HB* 05 12 50.0998659110 +16 40 49.755282314   13.36 12.177     ~ 27 0
133 NGC 1893 OpC 05 22 52.8 +33 26 32           ~ 270 0
134 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0

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