Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-22
Astron.Astrophys.411:157-160,2003
Astronomy and Astrophysics
Astrophysics
5 pages
Scientific paper
10.1051/0004-6361:20031428
Observations of the standard late type M8 star LHS 2397aA were obtained at the ESO-VLT 8m telescope ``Yepun'' using the NAOS/CONICA Adaptive Optics facility. The observations were taken during the NACO commissioning, and the infrared standard star LHS 2397aA was observed in the H, and Ks broad band filters. In both bands the brown dwarf companion LHS2397aB was detected. Using a program recently developed (Bouy et al., 2003) for the detection of stellar binaries we calculated the principal astrometric parameters (angular binary separation and position angle P.A.) and the photometry of LHS 2397aA and LHS 2397aB. Our study largely confirms previous results obtained with the AO-Hokupa'a facility at Gemini-North (Freed et al., 2003); however a few discrepancies are observed.
Bouy Herve
Brandner Wolfgang
Lacombe Francois
Lagrange Anne Marie
Lenzen Rainer
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