Physics – Optics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..828e&link_type=abstract
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.
Physics
Optics
Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Photometric And Spectroscopic Detection, Coronographic Detection, Interferometric Detection, Stellar Activity
Scientific paper
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.
Bedalov Ana
Eiff Matthias Ammler-von
Guenther Eike W.
Mugrauer Markus
Neuhäuser Ralph
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