2003A&A...409..933F

Query : 2003A&A...409..933F

2003A&A...409..933F - Astronomy and Astrophysics, volume 409, 933-939 (2003/10-3)

Optical polarization observations in the region of Stock 16.

FEINSTEIN C., BAUME G., VERGNE M.M. and VAZQUEZ R.

Abstract (from CDS):

We present (UBVRI) multicolor linear polarimetric data for 26 of the brightest stars in the area of the open cluster Stock 16 that were considered to study the properties of the ISM (interstellar medium) towards the cluster. Our data yield a mean polarization percentage of P∼2.5%, close to the polarization value produced by the ISM with normal efficiency (Pλmax∼5EB–V) undergoing a color excess of EB–V=0.51. The mean angle of the polarization vectors, θ=74.9deg, agrees quite well with the expected angle produced by dust particles aligned in the direction of the galactic disk (and the magnetic field) in the region. A study of the extinction suffered by the stars in the zone was also performed combining our new data with previous photometric data. In this sense, our analysis indicates that the visual absorption affecting Stock 16 stars is mainly produced in front of the cluster by a dust cloud at approximately 500pc from the sun. The large polarization value of the nonmember star, WR 51, confirms its background star nature.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: Stock 16

VizieR on-line data: <Available at CDS (J/A+A/409/933): tabla1.dat>

Nomenclature: Table 1: Cl* Stock 16 FBV A (Nos A-D).

CDS comments: Table 1 : Stars 1-29 = Cl* Stock 16 DGT NN, Stars 60a,60b = VDBH 60a,60b, Ly 235 = [L68] 235.

Simbad objects: 32

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Number of rows : 32
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 Ass Cen OB 1 As* 13 02 -61.4           ~ 106 0
2 NAME Cen R1 As* 13 08 -63.0           ~ 11 1
3 V* V593 Cen EB* 13 17 13.3430225184 -62 37 33.546708732   10.80 10.46     OB- 24 0
4 CD-61 3724 * 13 17 16.2396471384 -62 27 37.797611184   10.86 10.64     B3/5 4 0
5 CPD-61 3560 * 13 17 18.7674681000 -62 26 37.423187052   10.85 10.33     ~ 3 0
6 HD 115316 * 13 17 44.6939200896 -62 27 14.409424692 8.88 9.78 9.90 9.72   B3/6III/IV 41 0
7 HD 115345 * 13 17 57.6165111408 -62 27 20.904087888 8.95 9.24 9.09     B5/7III 18 0
8 CPD-61 3569 WR* 13 18 01.0421567664 -62 26 04.755661116 12.66 12.64 11.88 11.84   WC7+OB 62 0
9 MR 45 WR* 13 18 23.3593835760 -62 28 21.220535604   15.53 14.32 13.97   WN4-w 47 0
10 Cl Stock 16 64 * 13 18 27.0133 -62 30 14.221   13.05 12.68     ~ 4 0
11 HD 115455 SB* 13 18 35.3592390638 -62 29 28.407889555 7.40 8.17 7.97 8.81   O8III((f)) 103 1
12 CD-61 3731 * 13 18 39.2838141912 -62 31 48.227992464 9.1 9.68 9.53     B0.5V 22 0
13 CPD-61 3577 * 13 18 41.3084488392 -62 20 47.522057064   11.1 9.56     ~ 3 0
14 CD-61 3732 * 13 18 42.0770587944 -62 30 47.562446052 10.03 10.67 10.52 10.55   B2V 27 0
15 CPD-61 3581 * 13 18 44.9741082528 -62 30 04.442178960 9.81 10.42 10.26 10.23   B2V 28 0
16 CPD-61 3580 * 13 18 45.2333318688 -62 30 45.181085040 11.37 11.88 11.62     ~ 8 0
17 Cl Stock 16 9 * 13 18 47.9043592632 -62 28 51.653795952   14.46 13.49     ~ 4 0
18 Cl Stock 16 25 * 13 18 51.8831562528 -62 30 41.772639276   12.83 12.50     ~ 5 0
19 Cl Stock 16 34 * 13 18 53.2861 -62 31 33.058   13.89 13.51     ~ 4 0
20 Cl* Stock 16 VBF 14 * 13 18 54.8752 -62 35 04.799   13.05 12.70     B7V 9 0
21 V* V378 Cen cC* 13 18 58.2837275880 -62 22 56.406879948 9.9 9.63 8.54 8.93   F5Iab/b 119 0
22 Cl Stock 16 23 * 13 19 02.3286161136 -62 30 55.967816484   13.17 12.80     ~ 4 0
23 CPD-61 3587 * 13 19 03.9700032233 -62 34 10.159085928 10.48 11.02 10.73 10.80   B2V 40 1
24 Cl Stock 16 21 * 13 19 05.7739948992 -62 31 02.113166136   14.32 13.74     ~ 3 0
25 Cl Stock 16 OpC 13 19 26.4 -62 37 19           ~ 91 0
26 Ass Ara OB 1 As* 16 39.5 -46 46           ~ 93 0
27 NGC 6193 OpC 16 41 16.6 -48 46 37           ~ 158 0
28 NGC 6204 OpC 16 46 09 -47 01.6   8.51 8.2     ~ 129 0
29 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 98 1
30 Cl* Stock 16 DGT 13 * ~ ~   13.28 12.20     ~ 2 0
31 Cl* Stock 16 FBV A * ~ ~           ~ 1 0
32 Cl* Stock 16 DGT 14 * ~ ~   12.81 12.32     ~ 2 0

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