SCYON Abstract
Received on April 22 2005
The open cluster NGC 6520 and the nearby dark molecular cloud Barnard 86
Abstract
Wide field BVI photometry and 12CO(1->0) observations are presented
in the region of the open cluster NGC 6520 and the dark molecular cloud
Barnard 86. From the analysis of the optical data we find that the cluster is
rather compact, with a radius of 1.0 ± 0.5 arcmin, smaller than previous estimates.
The cluster age is 150 ± 50 Myr and the reddening EB-V = 0.42 ± 0.10. The distance
from the Sun is estimated to be 1900 ± 100 pc, and it is larger than previous estimates.
We finally derive basic properties of the dark nebula Barnard 86 on the assumption that it lies at the same distance of the cluster.