| Issue |
A&A
Volume 408, Number 1, September II 2003
|
|
|---|---|---|
| Page(s) | 135 - 140 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20030919 | |
| Published online | 17 November 2003 | |
Pismis 20: One or two clusters?*
1
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
2
Instituto de Astrofísica de La Plata, (IALP, CONICET), Paseo del Bosque s/n, 1900 La Plata, Argentina
3
Instituto de Astronomía y Física del Espacio, C. C. 67 Suc. 28, 1428 Buenos Aires, Argentina
Corresponding author: H. G. Marraco, hmarraco@fcaglp.unlp.edu.ar
Received:
30
December
2002
Accepted:
16
May
2003
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 
(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.
Key words: ISM: dust, extinction / open clusters and associations: individual: Pis20 / stars: individual: WR67 / technique: polarimetric
© ESO, 2003
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