M. Ammler-von Eiff
Abstract
The Ursa Major group is the closest moving group with its densest part being located in the direction of the Big Dipper constellation at a distance of about 25 pc. In spite of the small distance, the relatively young age of 200-600 Myrs, and the on average high proper motions, this sample of stars has not yet been addressed as a whole by direct imaging studies of sub-stellar companions in wide orbits. We searched the fields around more than 20 nearby Ursa Major group members at a distance of less than 30 pc using adaptive optics and coronography with NAOS/CONICA at the ESO VLT, Chile. Many sub-stellar companion candidates were detected in the first epoch imaging in 2003/2004. However the second epoch imaging in 2005/2006 revealed that none of these displayed common proper motion so that the candidates turned out to be unrelated objects.
Keywords
Low: luminosity: stars: subdwarfs: and: brown: dwarfs - Photometric: and: spectroscopic: detection - coronographic: detection - interferometric: detection - Stellar:activity
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
E. Stempels
AIP Publishing
Volume 1094, Page 828
2009 February
