5 papers
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.…
Rotational Periods of very Young Brown Dwarfs in ChaI
V. Joergens, Matilde Fernandéz, Ralph Neuhäuser +1
A photometric monitoring campaign of brown dwarfs in the ChaI star forming region in the i and R band revealed significant periodic variations of the three M6.5-M7 type brown dwarf…
A search for nearby young stars among the flare stars
Brigitte König, Ralph Neuhäuser, Valeri Hambaryan
Flare stars were discovered in the late 1940s in the solar vicinity and were named UV Cet-type variables (classical FSs). Among the FSs within 100 pc we search for young stars. For…
The distance to the nearest star-forming clouds: MBM12 and MBM20
T. Hearty, M. Fernandez, J. M. Alcala +2
We present high-resolution spectra (R ~ 49,000) of stars that have parallax measurements from the Hipparcos satellite and are projected along the line of sight to the two nearest k…
ROSAT PSPC observations of T Tauri stars in MBM12
T. Hearty, R. Neuhauser, B. Stelzer +4
We present the ROSAT PSPC pointed and ROSAT All-Sky Survey (RASS) observations and the results of our low and high spectral resolution optical follow-up observations of the T Tauri…