5 papers
The Rotation of Low-Mass Pre-Main-Sequence Stars
Robert D. Mathieu
Major photometric monitoring campaigns of star-forming regions in the past decade have provided rich rotation period distributions of pre-main-sequence stars. The rotation periods…
WIYN Open Cluster Study: Tidal Interactions in Solar type Binaries
S. Meibom, R. D. Mathieu
We present an ongoing study on tidal interactions in late-type close binary stars. New results on tidal circularization are combined with existing data to test and constrain theore…
Young Binary Stars and Associated Disks
Robert D. Mathieu, Andrea M. Ghez, Eric L. N. Jensen +1
The typical product of the star formation process is a binary star. Binaries have provided the first dynamical measures of the masses of pre-main-sequence (PMS) stars, providing su…
Optical spectroscopy of X-ray sources in the old open cluster M67
Maureen van den Berg, Frank Verbunt, Robert D. Mathieu
We have obtained optical spectra of seven stars in the old galactic cluster M67 that are unusual sources of X-rays, and investigate whether the X-ray emission is due to magnetic ac…
X rays from old open clusters: M 67 and NGC 188
T. Belloni, F. Verbunt, R. D. Mathieu
We have observed the old open clusters M 67 and NGC 188 with the ROSAT PSPC. In M 67 we detect a variety of X-ray sources. The X-ray emission by a cataclysmic variable, a single ho…