Pismis 20: One or two clusters?

dc.creator	Orsatti, Ana María
dc.creator	Vega, Ema Irene
dc.creator	Marraco, Hugo Gustavo
dc.date	2003
dc.date	2019-11-04T17:27:17Z
dc.identifier	http://sedici.unlp.edu.ar/handle/10915/84862
dc.identifier	issn:0004-6361
dc.description	We present <i>UBVRI</i> 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 P<SUB>max</SUB> (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.
dc.description	Facultad de Ciencias Astronómicas y Geofísicas
dc.description	Instituto de Astrofísica de La Plata
dc.format	application/pdf
dc.format	135-140
dc.language	en
dc.rights	http://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rights	Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subject	Ciencias Astronómicas
dc.subject	ISM: dust, extinction
dc.subject	Open clusters and associations: individual: Pis20
dc.subject	Stars: individual: WR67
dc.subject	Technique: polarimetric
dc.title	Pismis 20: One or two clusters?
dc.type	Articulo
dc.type	Articulo