6 papers · 1 filter
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 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…
Kinematics of T Tauri stars in Chamaeleon
Sabine Frink, Siegfried Roeser, Juan M. Alcala +2
We study the kinematics of T Tauri stars (TTS) located in the cores of the Chamaeleon clouds as well as far off these clouds. Our sample comprises 2 early type stars known to be re…
New proper motions of pre-main sequence stars in Taurus-Auriga
S. Frink, S. Roeser, R. Neuhaeuser +1
We present proper motions of 72 T Tauri stars located in the central region of Taurus-Auriga. These proper motions are taken from a new proper motion catalogue called STARNET. Our…
Derivation of the Galactic Rotation Curve using space velocities
S. Frink, B. Fuchs, S. Roeser +1
We present rotation curves of the Galaxy based on the space-velocities of 197 OB stars and 144 classical cepheids, respectively, which range over a galactocentric distance interval…