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On the nature of the blue giants in NGC 330
Eva K. Grebel, Wm James Roberts, Wolfgang Brandner
The young SMC cluster NGC 330 contains a number of blue stars that lie above the main-sequence turnoff found from our isochrone fitting and below the position of the blue supergian…
Low-mass star formation in CG1: a diffraction limited search for pre-main sequence stars next to NX Pup
W. Brandner, J. Bouvier, E. K. Grebel +3
Using adaptive optics at the ESO 3.6m telescope, we obtained diffraction limited JHK-images of the region around the Herbig AeBe star NX Pup. We clearly resolved the close companio…
Multiplicity among T Tauri stars in OB and T associations: Implications for binary star formation
Wolfgang Brandner, Juan M. Alcala, Michael Kunkel +2
We present first results of a survey for companions among X-ray selected pre-main sequence stars, most of them being weak-line T Tauri stars (WTTS). These T Tauri stars have been i…
The outburst of the T Tauri star EX Lupi in 1994
Thomas Lehmann, Bo Reipurth, Wolfgang Brandner
We have observed an outburst of the T Tauri star EX Lup in March 1994. We present both photometric (BVR) and spectroscopic (low and medium resolution) observations carried out duri…