8 papers
Multiwavelength study of X-ray emitting A- and B-stars testing the companion hypothesis
B. Stelzer, N. Huelamo, S. Hubrig +3
We report on the first results of a multi-wavelength approach to test the hypothesis that the X-ray emission from intermediate-mass stars is generated by late-type magnetically act…
An infrared imaging search for low-mass companions to members of the young nearby beta Pic and Tucana/Horologium associations
Ralph Neuh"auser, E. W. Guenther, J. Alves +3
We present deep high dynamic range infrared images of young nearby stars in the Tucana/Horologium and beta Pic associations, all ~ 10 to 35 Myrs young and at ~10 to 60 pc distance.…
Ground-based exoplanet near-infrared search by imaging and spectroscopy: 3 new companion candidates in TWA
Ralph Neuhaeuser, Nuria Huelamo, Eike W. Guenther +5
We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 100 pc) st…
An X-ray flare from the Lindroos binary system HD 560
B. Stelzer, N. Huelamo
We report on a large X-ray flare from the Lindroos binary system HD 560 during a pointed ROSAT PSPC observation. Strong magnetic activity is expected for the late-type component (a…
Direct imaging search for planetary companions next to young nearby stars
R. Neuhaeuser, E. Guenther, W. Brandner +6
We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 75 pc) sta…
Spectrum and proper motion of a brown dwarf companion of the T Tauri star CoD-33 7795
R. Neuhaeuser, E. W. Guenther, M. G. Petr +3
We present optical and infrared spectra as well as the proper motion of an H=12 mag object 2" off the ~5 mag brighter spectroscopic binary star CoD-33 7795 (=TWA-5), a member of th…