2008MNRAS.388..105M

Query : 2008MNRAS.388..105M

2008MNRAS.388..105M - Mon. Not. R. Astron. Soc., 388, 105-116 (2008/July-3)

Optical polarimetric study of open clusters: distribution of interstellar matter towards NGC 654.

MEDHI B.J., MAHESWAR G., PANDEY J.C., KUMAR T.S. and SAGAR R.

Abstract (from CDS):

We present new B,V and R linear polarimetric observations for 61 stars towards the region of the young open cluster NGC 654. In this study we found evidence for the presence of at least two layers of dust along the line of sight to the cluster. The distances to the two dust layers are estimated to be ∼200 pc and ∼1 kpc which are located much closer to the Sun than the cluster (∼2.4 kpc). Both the dust layers have their local magnetic field orientation nearly parallel to the direction of the Galactic plane. The foreground dust layer is found to have a ring morphology with the central hole coinciding with the centre of the cluster. The foreground dust grains are suggested to be mainly responsible for both the observed differential reddening and the polarization towards the cluster.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): polarization - dust, extinction - open clusters and associations: individual: NGC 654

Nomenclature: Tables 2, 4: Cl* NGC 654 MMP NN (Nos 1-61).

Simbad objects: 41

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Number of rows : 41
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 BD+64 106 ** 00 57 36.6894556320 +64 51 34.907455548 10.82 11.01   10.21   B1V 77 0
2 BD+61 310 Be* 01 42 00.9290174520 +61 47 43.598224716 9.68 9.81 9.29     B3 30 0
3 LDN 1332 DNe 01 42.5 +62 03           ~ 5 0
4 BD+61 314 * 01 43 11.4104318841 +62 05 38.716141066 9.2 9.53 9.45 9.513   B9III 23 0
5 LDN 1334 DNe 01 43.5 +61 57           ~ 5 0
6 NGC 654 21 * 01 43 39 +61 53.3   12.76 12.25     ~ 9 0
7 BD+61 315 * 01 43 43.3641861912 +61 50 03.561800856 10.8 10.32 9.54     A0Ib/II 42 1
8 NGC 654 18 * 01 43 46.4773356240 +61 52 51.512230812 13.22 13.14 12.44     B1V 18 0
9 NGC 654 24 * 01 43 49.9798408608 +61 54 14.845131036   14.77 13.83     ~ 11 0
10 NGC 654 3 * 01 43 51.4429546464 +61 51 11.190828420 11.99 12.11 11.39     B6:V 23 0
11 NGC 654 32 * 01 43 55.6985300712 +61 53 41.128050912 13.88 13.91 13.18     B2V 17 0
12 NGC 654 69 * 01 43 59.1464345256 +61 55 18.756575868 14.06 13.62 12.70     B1V 20 0
13 NGC 654 OpC 01 44 01.5 +61 53 06   7.34 6.5     ~ 206 0
14 NGC 654 68 * 01 44 01.8938894424 +61 55 16.854445524 13.58 13.44 12.50     B1V 18 0
15 LS I +61 222 * 01 44 08.0416366296 +61 53 42.930660804 11.35 11.40 10.65 10.46   B2II 23 0
16 HD 10494 * 01 44 11.6162113632 +61 50 59.289293076 9.58 8.52 7.31     F5Ia 120 0
17 NGC 654 53 * 01 44 13.1099199288 +61 52 30.935335764 11.92 11.95 11.35     B5V 23 0
18 NGC 654 104 * 01 44 20.9662979208 +61 50 37.488975504 12.72 12.79 12.23     B1.5V 18 0
19 NGC 654 97 * 01 44 21.7385491992 +61 51 43.820632224 12.26 12.34 11.78     B6:V 22 0
20 NGC 654 96 * 01 44 23.0111826576 +61 52 13.081363608   14.83 14.17     ~ 10 0
21 [ABC90] cad 10 C* 01 44 45.0271672440 +61 55 48.082344492           C 7 0
22 2MASS J01444836+6155161 C* 01 44 48.3745332840 +61 55 16.036360356           ~ 5 0
23 BD+61 319 * 01 45 23.0667815928 +61 44 44.941910208   9.99 9.80     B8V 12 0
24 LDN 1337 DNe 01 45.5 +61 55           ~ 6 0
25 NGC 663 OpC 01 46 22.2 +61 12 53   7.78 7.1     ~ 269 0
26 HD 12021 * 01 57 56.1374259408 -02 05 57.712014564   8.79 8.85     B8V 41 0
27 TGU H853 P2 DNe 02 07.6 +76 05           ~ 3 0
28 HD 14069 * 02 16 45.1936420248 +07 41 10.637150532   9.21 9.06     A0 61 0
29 TGU H853 P1 DNe 02 25.9 +75 35           ~ 3 0
30 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
31 V* CC Cas SB* 03 14 05.3361655368 +59 33 48.485582712 7.07 7.56 7.08     O8.5III(n)((f)) 308 0
32 HD 21447 * 03 30 00.1828170168 +55 27 06.506069256 5.160 5.140 5.090 5.01 5.02 A1Va 147 0
33 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
34 Cl Stock 16 OpC 13 19 26.4 -62 37 19           ~ 95 0
35 NGC 6167 OpC 16 34 41.4 -49 46 02   7.58 6.7     ~ 87 0
36 NGC 6193 OpC 16 41 14.9 -48 46 47           ~ 169 0
37 NGC 6204 OpC 16 46 09.1 -47 01 29   8.51 8.2     ~ 139 0
38 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
39 BD+38 4058 EB* 20 23 28.5314538120 +39 20 59.037427788 12.02 11.81 10.62     B0V 69 0
40 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
41 Cl* NGC 654 SAM 65 * ~ ~   13.83 13.31     ~ 3 0

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