2003A&A...408..135O

Query : 2003A&A...408..135O

2003A&A...408..135O - Astronomy and Astrophysics, volume 408135-140 (2003/9-2)

Pismis 20: One or two clusters?

ORSATTI A.M., VEGA E.I. and MARRACO H.G.

Abstract (from CDS):

We present UBVRI polarimetric observations of stars in the direction of the open cluster Pismis 20 and WR 67. It is found that the observed members segregate polarimetrically into two groups, with different associated mean Pmax (4.31 and 6.08% respectively). Although in the literature these stars are considered as members of the same cluster, the polarized light from these groups clearly differs. There are two possible explanations: very efficient polarizing dust particles exists between certain members of the cluster; or else Pismis 20 is composed of different groupings superimposed along the line of sight. WR 67 belongs to the group more affected by the dust.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - open clusters and associations: individual: Pis 20 - stars: individual: WR 67 - technique: polarimetric

CDS comments: Table 1 : stars NN are Cl Pismis 20 NN in Simbad.

Simbad objects: 22

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Number of rows : 22
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 HD 134877 WR* 15 14 57.7186057272 -59 50 30.215432688 12.13 12.19 11.34 11.08   WN8(h) 112 0
2 Cl Pismis 20 13 * 15 15 15.7237442760 -59 04 48.442337004 11.95 12.19 11.24 11.03   O7 22 0
3 Cl Pismis 20 1 * 15 15 19.5653213568 -59 03 24.176615904 13.55 13.65 12.65     ~ 16 0
4 Cl Pismis 20 12 * 15 15 20.2738340623 -59 03 48.599715440 15.15 15.18 14.20 13.859   ~ 12 0
5 Cl Pismis 20 10 * 15 15 20.3555532672 -59 04 31.270571112 13.59 13.78 12.94     ~ 11 0
6 Cl Pismis 20 2 * 15 15 22.0691635920 -59 03 45.526077036   13.46 12.48     O8.5I 10 0
7 Cl Pismis 20 9 * 15 15 22.3299044808 -59 04 30.843484932 12.13 12.28 13.43     O9III 13 0
8 Cl Pismis 20 11 * 15 15 22.3544327880 -59 04 17.409996192 11.51 11.67 10.73     B0Ib 20 0
9 Cl Pismis 20 OpC 15 15 23.5 -59 04 23   8.69 7.8     ~ 103 0
10 CPD-58 5866C * 15 15 23.5656897936 -59 03 58.957613496 12.75 12.88 11.94     ~ 13 0
11 Cl Pismis 20 7 * 15 15 23.7717207539 -59 04 17.069695433 10.99 11.46 10.54     B1Ib/II 24 0
12 HD 134959 s*b 15 15 24.0871041696 -59 04 29.296677756 9.05 9.14 8.10 8.642   B2Ia 83 0
13 Cl Pismis 20 4 * 15 15 30.9459668184 -59 03 50.251497012   13.57 12.90     ~ 8 0
14 MR 55 WR* 15 15 32.6272277376 -59 02 30.695283672 12.46 12.56 11.84 11.63   WN6-w 72 0
15 Cl* Pismis 20 MV 12 * 15 15 34.15 -59 02 29.4   13.93 13.40     ~ 6 0
16 Cl* Pismis 20 PPM 85 * ~ ~   16.53 15.44     ~ 4 0
17 Cl* Pismis 20 PPM 58 * ~ ~   16.36 15.38     ~ 3 0
18 Cl* Pismis 20 PPM 52 * ~ ~   16.99 16.19     ~ 3 0
19 Cl* Pismis 20 PPM 100 * ~ ~   16.80 15.77     ~ 4 0
20 Cl* Pismis 20 PPM 105 * ~ ~   15.52 14.61     ~ 4 0
21 Cl* Pismis 20 PPM 116 * ~ ~   14.99 14.28     ~ 3 0
22 Cl* Pismis 20 PPM 187 * ~ ~   15.47 14.65     ~ 3 0

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