7 papers · 1 filter
BS Indi: An enigmatic object
E. W. Guenther, E. Covino, J. M Alcala +2
BS Ind is a young K0V star in the Tucana association. Photometric observations with the Hipparcos satellite show an eclipse-like light-curve with primary and secondary eclipse. The…
Late-type field stars in the RASS at high galactic latitude
F. -J. Zickgraf, J. Krautter, S. Frink +4
We present results of an investigation on a high-galactic latitude sample of late-type field stars selected from the ROSAT All-Sky Survey (RASS). The sample comprises about 200 G,…
Timescales of disk evolution and planet formation
W. Brandner, H. Zinnecker, J. M. Alcala +7
We present high-spatial resolution HST and adaptive optics observations, and high-sensitivity ISO (ISOCAM & ISOPHOT) observations of a sample of X-ray selected weak-line (WTTS) and…
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…
The late-type stellar component in the ROSAT All-Sky Survey at high galactic latitude
F. -J. Zickgraf, J. M. Alcala, E. Covino +4
We investigated the properties of the late-type stellar component in the RASS at high-galactic latitude |b| based on an optically identified sample of ROSAT All-Sky Survey (RASS) X…
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…