2000AJ....120.1906F

Query : 2000AJ....120.1906F

2000AJ....120.1906F - Astron. J., 120, 1906-1912 (2000/October-0)

The highly polarized open cluster Trumpler 27.

FEINSTEIN C., BAUME G., VAZQUEZ R., NIEMELA V. and CERRUTI M.A.

Abstract (from CDS):

We have carried out multicolor linear polarimetry (UBVRI) of the brightest stars in the area of the open cluster Trumpler 27. Our data show a high level of polarization in the stellar light with a considerable dispersion, from P=4% to P=9.5%. The polarization vectors of the cluster members appear to be aligned. Foreground polarization was estimated from the data of some nonmember objects, for which two different components were resolved: the first one associated with a dust cloud close to the Sun producing Pλmax=1.3% and θ=146°, and a second component, the main source of polarization for the cluster members, originating in another dust cloud, which polarizes the light in the direction of θ=29°.5. From a detailed analysis, we found that the two components have associated values E_B-V_<0.45 for the first one and E_B-V_>0.75 for the other. Due the difference in the orientation of both polarization vectors, almost 90° (180° at the Stokes representation), the first cloud (θ∼146°) depolarizes the light strongly polarized by the second one (θ∼29°.5).

Abstract Copyright: ∼

Journal keyword(s): ISM: Dust, Extinction - open clusters and associations: individual (Trumpler 27)

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 6167 OpC 16 34 38.9 -49 45 32   7.58 6.7     ~ 81 0
2 Ass Ara OB 1 As* 16 39.5 -46 46           ~ 93 0
3 NGC 6193 OpC 16 41 16.6 -48 46 37           ~ 158 0
4 NGC 6204 OpC 16 46 09 -47 01.6   8.51 8.2     ~ 129 0
5 HD 317898 s*b 17 35 32.7941936856 -33 27 41.475136644 11.59 11.61 10.63 10.45   B1Ia 16 0
6 HD 159378 s*y 17 35 56.3571165552 -33 25 56.587663812   10.31 8.58     G3Ia-IabCN-1 34 1
7 Cl Trumpler 27 6 * 17 36 04.1549379192 -33 30 30.460351824   12.98 11.68     K5III 5 0
8 Cl Trumpler 27 30 * 17 36 05.5897450824 -33 27 50.708616696   15.27 13.79     OB-: 7 0
9 Cl Trumpler 27 8 * 17 36 09.7179631800 -33 30 54.793113444 14.1 13.54 11.88     OB 10 0
10 CD-33 12241 s*r 17 36 10.1192588472 -33 29 40.616892600 12.01 11.484 8.746 8.628   M0Ia 36 0
11 CPD-33 4470 s*b 17 36 10.7800944192 -33 28 47.981719704   11.80 10.54 10.33   B0Ia 11 0
12 HD 318014 s*b 17 36 12.8334995616 -33 29 19.065711156 11.07 10.32 9.03 9.06   B8Ia 24 0
13 Cl Trumpler 27 4 * 17 36 13.2534540744 -33 30 05.418256932   12.46 11.88 11.86   ~ 6 0
14 ALS 4256 LP? 17 36 14.4891519864 -33 29 16.755085212 13.53 12.61 10.61 9.77   OB: 15 0
15 Cl Trumpler 27 10 * 17 36 15.5758912968 -33 31 28.762535604   13.76 12.12     OB-+M2 9 0
16 Cl Trumpler 27 107 * 17 36 16.6609230360 -33 38 09.991518900 12.24 12.38 11.44 11.27   OB 15 0
17 Cl Trumpler 27 106 * 17 36 17.6722465560 -33 36 35.342846280 12.52 12.41 11.40 11.51   OB: 12 0
18 Cl Trumpler 27 11 * 17 36 18.92 -33 31 24.3   13.30 12.34     B5III 8 0
19 MR 74 WR* 17 36 19.8953017656 -33 26 12.271864344 16.01 14.87 13.18 12.99   WC9 90 1
20 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 98 1
21 CD-33 12247 * 17 36 23.3546772431 -33 31 45.169583757 12.45 12.46 11.20 10.89   B0Ib 15 0
22 CD-33 12248 s*b 17 36 24.3611441880 -33 33 10.053917928 11.9 11.85 10.74 10.53   B0.5Ia 16 0
23 V* V1082 Sco EB* 17 36 27.3946517448 -33 29 35.832155928 11.79 11.56 10.09 9.91   B0.7Ia 38 0
24 Cl Trumpler 27 27 * 17 36 29.9494444728 -33 26 34.187954784   15.47 13.31     O8III 11 0
25 CD-33 12255 * 17 36 32.1132954912 -33 27 49.092468480   11.85 10.81     G0: 7 0
26 Cl Trumpler 27 19 ** 17 36 32.2233851256 -33 31 52.224335652 14.05 13.685 12.639 12.687   OB- 10 0
27 Cl Trumpler 27 32 * 17 36 35.2621713648 -33 34 32.805224004   14.05 12.98     OB-: 8 0
28 Cl Trumpler 27 21 * 17 36 35.4157588128 -33 30 12.726690120 13.43 13.49 12.59     OB- 9 0
29 Cl Trumpler 27 22 * 17 36 37.6232589216 -33 30 18.753263964   12.65 11.48     ~ 5 0
30 Cl Trumpler 27 25 * 17 36 37.6331797416 -33 27 22.171327992 13.05 12.72 11.32     OB 11 0
31 CD-33 12256 * 17 36 39.7997895144 -33 21 16.654649652 11.19 11.47 10.68 10.58   O9III 14 0
32 Cl Trumpler 27 34 * 17 36 45.14 -33 31 55.0 14 13.97 12.94     B1V 11 0
33 HD 318016 WR* 17 37 13.7436747168 -33 27 56.013254280 13.71 13.16 11.81 11.42   WN8/WC7 79 0
34 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14436 0
35 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0
36 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1

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