332 citations · 422 across the 8 of their papers we have counts for
8 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,…
The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method
Douglas C. Leonard, Alexei V. Filippenko, Elinor L. Gates +13
We present 30 optical spectra and 49 photometric epochs sampling the first 517 days after discovery of supernova (SN) 1999em, and derive its distance through the expanding photosph…
A Strategy for Identifying the Grid Stars for the Space Interferometry Mission (SIM)
Sabine Frink, Andreas Quirrenbach, Debra Fischer +2
We present a strategy to identify several thousand stars that are astrometrically stable at the micro-arcsecond level for use in the SIM (Space Interferometry Mission) astrometric…
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…