Pismis 20: One or two clusters?

Details Pismis 20: One or two clusters? Pismis 20: One or two clusters?

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408..135o&link_type=abstract

Astronomy and Astrophysics, v.408, p.135-140 (2003)

Astronomy and Astrophysics

Astrophysics

2

Ism: Dust, Extinction, Open Clusters And Associations: Individual: Pis20, Stars: Individual: Wr67, Technique: Polarimetric

Scientific paper

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.
Based on observations obtained at Complejo Astronómico El Leoncito, operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the Universities of La Plata, Córdoba, and San Juan.

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