Adaptive Optics Search for Faint Companions Around Young Nearby Stars
Results of an ongoing coronographic NIR imaging survey using ADONIS at the 3.6m telescope are presented. The sample consists of young (ages ≤ 100Myr), and simultaneously nearby (distances ≤ 100pc) field stars. Several new, low-mass companions are found. Their physical association has been proven by repeated observations at different epochs. Although the sensitivity allows to probe companion masses well below the hydrogen burning limit, companions with large mass ratios appear to be rare. This finding is in general agreement with several previous and ongoing brown-dwarf companion searches. I suggest a possible explanation for the scarcity of close brown-dwarf companions in the framework of stellar dynamical few-body interactions in early phases of their formation and evolution.
KeywordsMass Function Adaptive Optic Nearby Star Dynamical Decay Separation Range
Unable to display preview. Download preview PDF.
- 7.S. Els, M.F. Sterzik et al.: AA 370, Ll (2001)Google Scholar
- 29.M.F. Sterzik, R.H. Durisen: `Binary Properties in Dynamically Decaying Few-Body Clusters’. In: Star Formation, Nagoya, Japan, June 21–25, 1999. ed. by T. Nakamoto ( Nobeyama Radio Observatory, Nagano, 1999 ) pp. 387–388Google Scholar
- 30.M.F. Sterzik, F. Marchis et al.: in prep. Google Scholar